ICD-10 · PDGM grouping
O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
All 36 codes in the O10 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
36
Can lead a claim
30
Cannot lead a claim
6
What CMS assigns to O10
30 of the 36 codes group to MMTA - Other; 6 are assigned no clinical group. None of the 36 is assigned a comorbidity subgroup. 30 of the 36 can lead a claim.
Every code in O10
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 |
|---|---|---|---|---|
| O10.0 Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium | ||||
| O10.01 Pre-existing essential hypertension complicating pregnancy | ||||
| O10.011 | Pre-existing essential hypertension complicating pregnancy, first trimesterCMS: Pre-existing essential htn comp pregnancy, first trimester | Can lead a claim | A | None |
| O10.012 | Pre-existing essential hypertension complicating pregnancy, second trimesterCMS: Pre-existing essential htn comp pregnancy, second trimester | Can lead a claim | A | None |
| O10.013 | Pre-existing essential hypertension complicating pregnancy, third trimesterCMS: Pre-existing essential htn comp pregnancy, third trimester | Can lead a claim | A | None |
| O10.019 | Pre-existing essential hypertension complicating pregnancy, unspecified trimesterCMS: Pre-existing essential htn comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O10.02 | Pre-existing essential hypertension complicating childbirth | Can lead a claim | A | None |
| O10.03 | Pre-existing essential hypertension complicating the puerperiumCMS: Pre-existing essential hypertension comp the puerperium | Can lead a claim | A | None |
| O10.1 Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium | ||||
| O10.11 Pre-existing hypertensive heart disease complicating pregnancy | ||||
| O10.111 | Pre-existing hypertensive heart disease complicating pregnancy, first trimesterCMS: Pre-exist hyp heart disease comp pregnancy, first trimester | Can lead a claim | A | None |
| O10.112 | Pre-existing hypertensive heart disease complicating pregnancy, second trimesterCMS: Pre-exist hyp heart disease comp pregnancy, second trimester | Can lead a claim | A | None |
| O10.113 | Pre-existing hypertensive heart disease complicating pregnancy, third trimesterCMS: Pre-exist hyp heart disease comp pregnancy, third trimester | Can lead a claim | A | None |
| O10.119 | Pre-existing hypertensive heart disease complicating pregnancy, unspecified trimesterCMS: Pre-exist hyp heart disease comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O10.12 | Pre-existing hypertensive heart disease complicating childbirthCMS: Pre-existing hypertensive heart disease comp childbirth | Can lead a claim | A | None |
| O10.13 | Pre-existing hypertensive heart disease complicating the puerperiumCMS: Pre-existing hypertensive heart disease comp the puerperium | Can lead a claim | A | None |
| O10.2 Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium | ||||
| O10.21 Pre-existing hypertensive chronic kidney disease complicating pregnancy | ||||
| O10.211 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, first trimesterCMS: Pre-exist hyp chronic kidney disease comp preg, first tri | Can lead a claim | A | None |
| O10.212 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, second trimesterCMS: Pre-exist hyp chronic kidney disease comp preg, second tri | Can lead a claim | A | None |
| O10.213 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, third trimesterCMS: Pre-exist hyp chronic kidney disease comp preg, third tri | Can lead a claim | A | None |
| O10.219 | Pre-existing hypertensive chronic kidney disease complicating pregnancy, unspecified trimesterCMS: Pre-exist hyp chronic kidney disease comp preg, unsp tri | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O10.22 | Pre-existing hypertensive chronic kidney disease complicating childbirthCMS: Pre-existing hyp chronic kidney disease comp childbirth | Can lead a claim | A | None |
| O10.23 | Pre-existing hypertensive chronic kidney disease complicating the puerperiumCMS: Pre-existing hyp chronic kidney disease comp the puerperium | Can lead a claim | A | None |
| O10.3 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium | ||||
| O10.31 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy | ||||
| O10.311 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, first trimesterCMS: Pre-exist hyp heart and chr kidney dis comp preg, first tri | Can lead a claim | A | None |
| O10.312 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimesterCMS: Pre-exist hyp heart and chr kidney dis comp preg, second tri | Can lead a claim | A | None |
| O10.313 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimesterCMS: Pre-exist hyp heart and chr kidney dis comp preg, third tri | Can lead a claim | A | None |
| O10.319 | Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, unspecified trimesterCMS: Pre-exist hyp heart and chr kidney dis comp preg, unsp tri | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O10.32 | Pre-existing hypertensive heart and chronic kidney disease complicating childbirthCMS: Pre-exist hyp heart and chronic kidney disease comp chldbrth | Can lead a claim | A | None |
| O10.33 | Pre-existing hypertensive heart and chronic kidney disease complicating the puerperiumCMS: Pre-exist hyp heart and chr kidney disease comp the puerp | Can lead a claim | A | None |
| O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium | ||||
| O10.41 Pre-existing secondary hypertension complicating pregnancy | ||||
| O10.411 | Pre-existing secondary hypertension complicating pregnancy, first trimesterCMS: Pre-existing secondary htn comp pregnancy, first trimester | Can lead a claim | A | None |
| O10.412 | Pre-existing secondary hypertension complicating pregnancy, second trimesterCMS: Pre-existing secondary htn comp pregnancy, second trimester | Can lead a claim | A | None |
| O10.413 | Pre-existing secondary hypertension complicating pregnancy, third trimesterCMS: Pre-existing secondary htn comp pregnancy, third trimester | Can lead a claim | A | None |
| O10.419 | Pre-existing secondary hypertension complicating pregnancy, unspecified trimesterCMS: Pre-existing secondary htn comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O10.42 | Pre-existing secondary hypertension complicating childbirth | Can lead a claim | A | None |
| O10.43 | Pre-existing secondary hypertension complicating the puerperiumCMS: Pre-existing secondary hypertension comp the puerperium | Can lead a claim | A | None |
| O10.9 Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium | ||||
| O10.91 Unspecified pre-existing hypertension complicating pregnancy | ||||
| O10.911 | Unspecified pre-existing hypertension complicating pregnancy, first trimesterCMS: Unsp pre-existing htn comp pregnancy, first trimester | Can lead a claim | A | None |
| O10.912 | Unspecified pre-existing hypertension complicating pregnancy, second trimesterCMS: Unsp pre-existing htn comp pregnancy, second trimester | Can lead a claim | A | None |
| O10.913 | Unspecified pre-existing hypertension complicating pregnancy, third trimesterCMS: Unsp pre-existing htn comp pregnancy, third trimester | Can lead a claim | A | None |
| O10.919 | Unspecified pre-existing hypertension complicating pregnancy, unspecified trimesterCMS: Unsp pre-existing htn comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O10.92 | Unspecified pre-existing hypertension complicating childbirthCMS: Unsp pre-existing hypertension complicating childbirth | Can lead a claim | A | None |
| O10.93 | Unspecified pre-existing hypertension complicating the puerperiumCMS: Unsp pre-existing hypertension complicating the puerperium | Can lead a claim | A | 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.
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