ICD-10 · PDGM grouping
O31 Complications specific to multiple gestation
All 168 codes in the O31 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
168
Can lead a claim
0
Cannot lead a claim
168
What CMS assigns to O31
None of the 168 codes is assigned a clinical group. None of the 168 is assigned a comorbidity subgroup. None can lead a claim.
Every code in O31
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| O31.0 Papyraceous fetus | ||||
| O31.00 Papyraceous fetus, unspecified trimester | ||||
| O31.00X0 | Papyraceous fetus, unspecified trimester, not applicable or unspecifiedCMS: Papyraceous fetus, unsp trimester, not applicable or unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.00X1 | Papyraceous fetus, unspecified trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.00X2 | Papyraceous fetus, unspecified trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.00X3 | Papyraceous fetus, unspecified trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.00X4 | Papyraceous fetus, unspecified trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.00X5 | Papyraceous fetus, unspecified trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.00X9 | Papyraceous fetus, unspecified trimester, other fetus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01 Papyraceous fetus, first trimester | ||||
| O31.01X0 | Papyraceous fetus, first trimester, not applicable or unspecifiedCMS: Papyraceous fetus, first trimester, not applicable or unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01X1 | Papyraceous fetus, first trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01X2 | Papyraceous fetus, first trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01X3 | Papyraceous fetus, first trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01X4 | Papyraceous fetus, first trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01X5 | Papyraceous fetus, first trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.01X9 | Papyraceous fetus, first trimester, other fetus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02 Papyraceous fetus, second trimester | ||||
| O31.02X0 | Papyraceous fetus, second trimester, not applicable or unspecifiedCMS: Papyraceous fetus, second trimester, not applicable or unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02X1 | Papyraceous fetus, second trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02X2 | Papyraceous fetus, second trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02X3 | Papyraceous fetus, second trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02X4 | Papyraceous fetus, second trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02X5 | Papyraceous fetus, second trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.02X9 | Papyraceous fetus, second trimester, other fetus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03 Papyraceous fetus, third trimester | ||||
| O31.03X0 | Papyraceous fetus, third trimester, not applicable or unspecifiedCMS: Papyraceous fetus, third trimester, not applicable or unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03X1 | Papyraceous fetus, third trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03X2 | Papyraceous fetus, third trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03X3 | Papyraceous fetus, third trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03X4 | Papyraceous fetus, third trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03X5 | Papyraceous fetus, third trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.03X9 | Papyraceous fetus, third trimester, other fetus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.1 Continuing pregnancy after spontaneous abortion of one fetus or more | ||||
| O31.10 Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester | ||||
| O31.10X0 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecifiedCMS: Cont preg aft spon abort of one fts or more, unsp tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.10X1 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 1CMS: Cont preg aft spon abort of one fts or more, unsp tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.10X2 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 2CMS: Cont preg aft spon abort of one fts or more, unsp tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.10X3 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 3CMS: Cont preg aft spon abort of one fts or more, unsp tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.10X4 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 4CMS: Cont preg aft spon abort of one fts or more, unsp tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.10X5 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 5CMS: Cont preg aft spon abort of one fts or more, unsp tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.10X9 | Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, other fetusCMS: Cont preg aft spon abort of one fetus or more, unsp tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11 Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester | ||||
| O31.11X0 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, not applicable or unspecifiedCMS: Cont preg aft spon abort of one fts or more, first tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11X1 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 1CMS: Cont preg aft spon abort of one fts or more, first tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11X2 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 2CMS: Cont preg aft spon abort of one fts or more, first tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11X3 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 3CMS: Cont preg aft spon abort of one fts or more, first tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11X4 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 4CMS: Cont preg aft spon abort of one fts or more, first tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11X5 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 5CMS: Cont preg aft spon abort of one fts or more, first tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.11X9 | Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, other fetusCMS: Cont preg aft spon abort of one fts or more, first tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12 Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester | ||||
| O31.12X0 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, not applicable or unspecifiedCMS: Cont preg aft spon abort of one fetus or more, 2nd tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12X1 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 1CMS: Cont preg aft spon abort of one fetus or more, 2nd tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12X2 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 2CMS: Cont preg aft spon abort of one fetus or more, 2nd tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12X3 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 3CMS: Cont preg aft spon abort of one fetus or more, 2nd tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12X4 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 4CMS: Cont preg aft spon abort of one fetus or more, 2nd tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12X5 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 5CMS: Cont preg aft spon abort of one fetus or more, 2nd tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.12X9 | Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, other fetusCMS: Cont preg aft spon abort of one fetus or more, 2nd tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13 Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester | ||||
| O31.13X0 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, not applicable or unspecifiedCMS: Cont preg aft spon abort of one fts or more, third tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13X1 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 1CMS: Cont preg aft spon abort of one fts or more, third tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13X2 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 2CMS: Cont preg aft spon abort of one fts or more, third tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13X3 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 3CMS: Cont preg aft spon abort of one fts or more, third tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13X4 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 4CMS: Cont preg aft spon abort of one fts or more, third tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13X5 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 5CMS: Cont preg aft spon abort of one fts or more, third tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.13X9 | Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, other fetusCMS: Cont preg aft spon abort of one fts or more, third tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.2 Continuing pregnancy after intrauterine death of one fetus or more | ||||
| O31.20 Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester | ||||
| O31.20X0 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, not applicable or unspecifiedCMS: Cont preg aft uterin dth of one fts or more, unsp tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.20X1 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 1CMS: Cont preg aft uterin dth of one fts or more, unsp tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.20X2 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 2CMS: Cont preg aft uterin dth of one fts or more, unsp tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.20X3 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 3CMS: Cont preg aft uterin dth of one fts or more, unsp tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.20X4 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 4CMS: Cont preg aft uterin dth of one fts or more, unsp tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.20X5 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 5CMS: Cont preg aft uterin dth of one fts or more, unsp tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.20X9 | Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, other fetusCMS: Cont preg aft uterin dth of one fetus or more, unsp tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21 Continuing pregnancy after intrauterine death of one fetus or more, first trimester | ||||
| O31.21X0 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, not applicable or unspecifiedCMS: Cont preg aft uterin dth of one fts or more, first tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21X1 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 1CMS: Cont preg aft uterin dth of one fts or more, first tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21X2 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 2CMS: Cont preg aft uterin dth of one fts or more, first tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21X3 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 3CMS: Cont preg aft uterin dth of one fts or more, first tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21X4 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 4CMS: Cont preg aft uterin dth of one fts or more, first tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21X5 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 5CMS: Cont preg aft uterin dth of one fts or more, first tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.21X9 | Continuing pregnancy after intrauterine death of one fetus or more, first trimester, other fetusCMS: Cont preg aft uterin dth of one fts or more, first tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22 Continuing pregnancy after intrauterine death of one fetus or more, second trimester | ||||
| O31.22X0 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, not applicable or unspecifiedCMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22X1 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 1CMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22X2 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 2CMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22X3 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 3CMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22X4 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 4CMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22X5 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 5CMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.22X9 | Continuing pregnancy after intrauterine death of one fetus or more, second trimester, other fetusCMS: Cont preg aft uterin dth of one fetus or more, 2nd tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23 Continuing pregnancy after intrauterine death of one fetus or more, third trimester | ||||
| O31.23X0 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, not applicable or unspecifiedCMS: Cont preg aft uterin dth of one fts or more, third tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23X1 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 1CMS: Cont preg aft uterin dth of one fts or more, third tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23X2 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 2CMS: Cont preg aft uterin dth of one fts or more, third tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23X3 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 3CMS: Cont preg aft uterin dth of one fts or more, third tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23X4 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 4CMS: Cont preg aft uterin dth of one fts or more, third tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23X5 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 5CMS: Cont preg aft uterin dth of one fts or more, third tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.23X9 | Continuing pregnancy after intrauterine death of one fetus or more, third trimester, other fetusCMS: Cont preg aft uterin dth of one fts or more, third tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.3 Continuing pregnancy after elective fetal reduction of one fetus or more | ||||
| O31.30 Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester | ||||
| O31.30X0 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, not applicable or unspecifiedCMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri,unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.30X1 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 1CMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri,fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.30X2 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 2CMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri,fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.30X3 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 3CMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri,fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.30X4 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 4CMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri,fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.30X5 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 5CMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri,fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.30X9 | Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, other fetusCMS: Cont preg aft elctv fetl rdct of 1 fts or more,unsp tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31 Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester | ||||
| O31.31X0 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, not applicable or unspecifiedCMS: Cont preg aft elctv fetl rdct of 1 fts or more,1st tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31X1 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 1CMS: Cont preg aft elctv fetl rdct of 1 fts or more,1st tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31X2 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 2CMS: Cont preg aft elctv fetl rdct of 1 fts or more,1st tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31X3 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 3CMS: Cont preg aft elctv fetl rdct of 1 fts or more,1st tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31X4 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 4CMS: Cont preg aft elctv fetl rdct of 1 fts or more,1st tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31X5 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 5CMS: Cont preg aft elctv fetl rdct of 1 fts or more,1st tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.31X9 | Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, other fetusCMS: Cont preg aft elctv fetl rdct of 1 fts or more, 1st tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32 Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester | ||||
| O31.32X0 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, not applicable or unspecifiedCMS: Cont preg aft elctv fetl rdct of 1 fts or more,2nd tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32X1 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 1CMS: Cont preg aft elctv fetl rdct of 1 fts or more,2nd tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32X2 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 2CMS: Cont preg aft elctv fetl rdct of 1 fts or more,2nd tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32X3 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 3CMS: Cont preg aft elctv fetl rdct of 1 fts or more,2nd tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32X4 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 4CMS: Cont preg aft elctv fetl rdct of 1 fts or more,2nd tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32X5 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 5CMS: Cont preg aft elctv fetl rdct of 1 fts or more,2nd tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.32X9 | Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, other fetusCMS: Cont preg aft elctv fetl rdct of 1 fts or more, 2nd tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33 Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester | ||||
| O31.33X0 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, not applicable or unspecifiedCMS: Cont preg aft elctv fetl rdct of 1 fts or more,3rd tri, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33X1 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 1CMS: Cont preg aft elctv fetl rdct of 1 fts or more,3rd tri, fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33X2 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 2CMS: Cont preg aft elctv fetl rdct of 1 fts or more,3rd tri, fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33X3 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 3CMS: Cont preg aft elctv fetl rdct of 1 fts or more,3rd tri, fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33X4 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 4CMS: Cont preg aft elctv fetl rdct of 1 fts or more,3rd tri, fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33X5 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 5CMS: Cont preg aft elctv fetl rdct of 1 fts or more,3rd tri, fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.33X9 | Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, other fetusCMS: Cont preg aft elctv fetl rdct of 1 fts or more, 3rd tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.4 Continuing pregnancy after vanishing twin syndrome of one fetus or more | ||||
| O31.40 Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester | ||||
| O31.40X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, not applicable or unspecifiedCMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.40X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 1CMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.40X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 2CMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.40X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 3CMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.40X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 4CMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.40X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 5CMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.40X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, other fetusCMS: Cont preg aft vanishing twin syn 1 fts or more,unsp tri,oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41 Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester | ||||
| O31.41X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, not applicable or unspecifiedCMS: Cont preg aft vanishing twin syn 1 fts or more,1st tri,unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 1CMS: Cont preg aft vanishing twin syn 1 fts or more,1st tri,fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 2CMS: Cont preg aft vanishing twin syn 1 fts or more,1st tri,fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 3CMS: Cont preg aft vanishing twin syn 1 fts or more,1st tri,fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 4CMS: Cont preg aft vanishing twin syn 1 fts or more,1st tri,fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 5CMS: Cont preg aft vanishing twin syn 1 fts or more,1st tri,fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.41X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, other fetusCMS: Cont preg aft vanishing twin syn 1 fts or more, 1st tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42 Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester | ||||
| O31.42X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, not applicable or unspecifiedCMS: Cont preg aft vanishing twin syn 1 fts or more,2nd tri,unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 1CMS: Cont preg aft vanishing twin syn 1 fts or more,2nd tri,fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 2CMS: Cont preg aft vanishing twin syn 1 fts or more,2nd tri,fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 3CMS: Cont preg aft vanishing twin syn 1 fts or more,2nd tri,fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 4CMS: Cont preg aft vanishing twin syn 1 fts or more,2nd tri,fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 5CMS: Cont preg aft vanishing twin syn 1 fts or more,2nd tri,fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.42X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, other fetusCMS: Cont preg aft vanishing twin syn 1 fts or more, 2nd tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43 Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester | ||||
| O31.43X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, not applicable or unspecifiedCMS: Cont preg aft vanishing twin syn 1 fts or more,3rd tri,unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 1CMS: Cont preg aft vanishing twin syn 1 fts or more,3rd tri,fts1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 2CMS: Cont preg aft vanishing twin syn 1 fts or more,3rd tri,fts2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 3CMS: Cont preg aft vanishing twin syn 1 fts or more,3rd tri,fts3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 4CMS: Cont preg aft vanishing twin syn 1 fts or more,3rd tri,fts4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 5CMS: Cont preg aft vanishing twin syn 1 fts or more,3rd tri,fts5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.43X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, other fetusCMS: Cont preg aft vanishing twin syn 1 fts or more, 3rd tri, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8 Other complications specific to multiple gestation | ||||
| O31.8X Other complications specific to multiple gestation | ||||
| O31.8X1 Other complications specific to multiple gestation, first trimester | ||||
| O31.8X10 | Other complications specific to multiple gestation, first trimester, not applicable or unspecifiedCMS: Oth comp specific to multiple gest, first trimester, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X11 | Other complications specific to multiple gestation, first trimester, fetus 1CMS: Oth comp specific to multiple gest, first trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X12 | Other complications specific to multiple gestation, first trimester, fetus 2CMS: Oth comp specific to multiple gest, first trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X13 | Other complications specific to multiple gestation, first trimester, fetus 3CMS: Oth comp specific to multiple gest, first trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X14 | Other complications specific to multiple gestation, first trimester, fetus 4CMS: Oth comp specific to multiple gest, first trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X15 | Other complications specific to multiple gestation, first trimester, fetus 5CMS: Oth comp specific to multiple gest, first trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X19 | Other complications specific to multiple gestation, first trimester, other fetusCMS: Oth comp specific to multiple gest, first trimester, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X2 Other complications specific to multiple gestation, second trimester | ||||
| O31.8X20 | Other complications specific to multiple gestation, second trimester, not applicable or unspecifiedCMS: Oth comp specific to multiple gest, second trimester, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X21 | Other complications specific to multiple gestation, second trimester, fetus 1CMS: Oth comp specific to multiple gest, second tri, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X22 | Other complications specific to multiple gestation, second trimester, fetus 2CMS: Oth comp specific to multiple gest, second tri, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X23 | Other complications specific to multiple gestation, second trimester, fetus 3CMS: Oth comp specific to multiple gest, second tri, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X24 | Other complications specific to multiple gestation, second trimester, fetus 4CMS: Oth comp specific to multiple gest, second tri, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X25 | Other complications specific to multiple gestation, second trimester, fetus 5CMS: Oth comp specific to multiple gest, second tri, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X29 | Other complications specific to multiple gestation, second trimester, other fetusCMS: Oth comp specific to multiple gest, second trimester, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X3 Other complications specific to multiple gestation, third trimester | ||||
| O31.8X30 | Other complications specific to multiple gestation, third trimester, not applicable or unspecifiedCMS: Oth comp specific to multiple gest, third trimester, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X31 | Other complications specific to multiple gestation, third trimester, fetus 1CMS: Oth comp specific to multiple gest, third trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X32 | Other complications specific to multiple gestation, third trimester, fetus 2CMS: Oth comp specific to multiple gest, third trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X33 | Other complications specific to multiple gestation, third trimester, fetus 3CMS: Oth comp specific to multiple gest, third trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X34 | Other complications specific to multiple gestation, third trimester, fetus 4CMS: Oth comp specific to multiple gest, third trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X35 | Other complications specific to multiple gestation, third trimester, fetus 5CMS: Oth comp specific to multiple gest, third trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X39 | Other complications specific to multiple gestation, third trimester, other fetusCMS: Oth comp specific to multiple gest, third trimester, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X9 Other complications specific to multiple gestation, unspecified trimester | ||||
| O31.8X90 | Other complications specific to multiple gestation, unspecified trimester, not applicable or unspecifiedCMS: Oth comp specific to multiple gest, unsp trimester, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X91 | Other complications specific to multiple gestation, unspecified trimester, fetus 1CMS: Oth comp specific to multiple gest, unsp trimester, fetus 1 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X92 | Other complications specific to multiple gestation, unspecified trimester, fetus 2CMS: Oth comp specific to multiple gest, unsp trimester, fetus 2 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X93 | Other complications specific to multiple gestation, unspecified trimester, fetus 3CMS: Oth comp specific to multiple gest, unsp trimester, fetus 3 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X94 | Other complications specific to multiple gestation, unspecified trimester, fetus 4CMS: Oth comp specific to multiple gest, unsp trimester, fetus 4 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X95 | Other complications specific to multiple gestation, unspecified trimester, fetus 5CMS: Oth comp specific to multiple gest, unsp trimester, fetus 5 | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O31.8X99 | Other complications specific to multiple gestation, unspecified trimester, other fetusCMS: Oth comp specific to multiple gestation, unsp trimester, oth | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff. Read the first issue