ICD-10 · PDGM grouping
O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
All 96 codes in the O99 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
96
Can lead a claim
82
Cannot lead a claim
14
What CMS assigns to O99
82 of the 96 codes group to MMTA - Other; 14 are assigned no clinical group. None of the 96 is assigned a comorbidity subgroup. 82 of the 96 can lead a claim.
Every code in O99
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 |
|---|---|---|---|---|
| O99.0 Anemia complicating pregnancy, childbirth and the puerperium | ||||
| O99.01 Anemia complicating pregnancy | ||||
| O99.011 | Anemia complicating pregnancy, first trimester | Can lead a claim | A | None |
| O99.012 | Anemia complicating pregnancy, second trimester | Can lead a claim | A | None |
| O99.013 | Anemia complicating pregnancy, third trimester | Can lead a claim | A | None |
| O99.019 | Anemia complicating pregnancy, unspecified trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.02 | Anemia complicating childbirth | Can lead a claim | A | None |
| O99.03 | Anemia complicating the puerperium | Can lead a claim | A | None |
| O99.1 Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium | ||||
| O99.11 Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy | ||||
| O99.111 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, first trimesterCMS: Oth dis of bld/bld-form org/immun mechnsm comp preg, 1st tri | Can lead a claim | A | None |
| O99.112 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, second trimesterCMS: Oth dis of bld/bld-form org/immun mechnsm comp preg, 2nd tri | Can lead a claim | A | None |
| O99.113 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, third trimesterCMS: Oth dis of bld/bld-form org/immun mechnsm comp preg, 3rd tri | Can lead a claim | A | None |
| O99.119 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, unspecified trimesterCMS: Oth dis of bld/bld-form org/immun mechnsm comp preg,unsp tri | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.12 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirthCMS: Oth dis of the bld/bld-form org/immun mechnsm comp chldbrth | Can lead a claim | A | None |
| O99.13 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating the puerperiumCMS: Oth dis of the bld/bld-form org/immun mechnsm comp the puerp | Can lead a claim | A | None |
| O99.2 Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium | ||||
| O99.21 Obesity complicating pregnancy, childbirth, and the puerperium | ||||
| O99.210 | Obesity complicating pregnancy, unspecified trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.211 | Obesity complicating pregnancy, first trimester | Can lead a claim | A | None |
| O99.212 | Obesity complicating pregnancy, second trimester | Can lead a claim | A | None |
| O99.213 | Obesity complicating pregnancy, third trimester | Can lead a claim | A | None |
| O99.214 | Obesity complicating childbirth | Can lead a claim | A | None |
| O99.215 | Obesity complicating the puerperium | Can lead a claim | A | None |
| O99.28 Other endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium | ||||
| O99.280 | Endocrine, nutritional and metabolic diseases complicating pregnancy, unspecified trimesterCMS: Endo, nutritional and metab diseases comp preg, unsp tri | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.281 | Endocrine, nutritional and metabolic diseases complicating pregnancy, first trimesterCMS: Endo, nutritional and metab diseases comp preg, first tri | Can lead a claim | A | None |
| O99.282 | Endocrine, nutritional and metabolic diseases complicating pregnancy, second trimesterCMS: Endo, nutritional and metab diseases comp preg, second tri | Can lead a claim | A | None |
| O99.283 | Endocrine, nutritional and metabolic diseases complicating pregnancy, third trimesterCMS: Endo, nutritional and metab diseases comp preg, third tri | Can lead a claim | A | None |
| O99.284 | Endocrine, nutritional and metabolic diseases complicating childbirthCMS: Endocrine, nutritional and metabolic diseases comp chldbrth | Can lead a claim | A | None |
| O99.285 | Endocrine, nutritional and metabolic diseases complicating the puerperiumCMS: Endocrine, nutritional and metabolic diseases comp the puerp | Can lead a claim | A | None |
| O99.3 Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium | ||||
| O99.31 Alcohol use complicating pregnancy, childbirth, and the puerperium | ||||
| O99.310 | Alcohol use complicating pregnancy, unspecified trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.311 | Alcohol use complicating pregnancy, first trimester | Can lead a claim | A | None |
| O99.312 | Alcohol use complicating pregnancy, second trimester | Can lead a claim | A | None |
| O99.313 | Alcohol use complicating pregnancy, third trimester | Can lead a claim | A | None |
| O99.314 | Alcohol use complicating childbirth | Can lead a claim | A | None |
| O99.315 | Alcohol use complicating the puerperium | Can lead a claim | A | None |
| O99.32 Drug use complicating pregnancy, childbirth, and the puerperium | ||||
| O99.320 | Drug use complicating pregnancy, unspecified trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.321 | Drug use complicating pregnancy, first trimester | Can lead a claim | A | None |
| O99.322 | Drug use complicating pregnancy, second trimester | Can lead a claim | A | None |
| O99.323 | Drug use complicating pregnancy, third trimester | Can lead a claim | A | None |
| O99.324 | Drug use complicating childbirth | Can lead a claim | A | None |
| O99.325 | Drug use complicating the puerperium | Can lead a claim | A | None |
| O99.33 Tobacco use disorder complicating pregnancy, childbirth, and the puerperium | ||||
| O99.330 | Smoking (tobacco) complicating pregnancy, unspecified trimesterCMS: Smoking (tobacco) complicating pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.331 | Smoking (tobacco) complicating pregnancy, first trimester | Can lead a claim | A | None |
| O99.332 | Smoking (tobacco) complicating pregnancy, second trimester | Can lead a claim | A | None |
| O99.333 | Smoking (tobacco) complicating pregnancy, third trimester | Can lead a claim | A | None |
| O99.334 | Smoking (tobacco) complicating childbirth | Can lead a claim | A | None |
| O99.335 | Smoking (tobacco) complicating the puerperium | Can lead a claim | A | None |
| O99.34 Other mental disorders complicating pregnancy, childbirth, and the puerperium | ||||
| O99.340 | Other mental disorders complicating pregnancy, unspecified trimesterCMS: Oth mental disorders complicating pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.341 | Other mental disorders complicating pregnancy, first trimesterCMS: Oth mental disorders complicating pregnancy, first trimester | Can lead a claim | A | None |
| O99.342 | Other mental disorders complicating pregnancy, second trimesterCMS: Oth mental disorders comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.343 | Other mental disorders complicating pregnancy, third trimesterCMS: Oth mental disorders complicating pregnancy, third trimester | Can lead a claim | A | None |
| O99.344 | Other mental disorders complicating childbirth | Can lead a claim | A | None |
| O99.345 | Other mental disorders complicating the puerperium | Can lead a claim | A | None |
| O99.35 Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium | ||||
| O99.350 | Diseases of the nervous system complicating pregnancy, unspecified trimesterCMS: Diseases of the nervous sys comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.351 | Diseases of the nervous system complicating pregnancy, first trimesterCMS: Diseases of the nervous sys comp pregnancy, first trimester | Can lead a claim | A | None |
| O99.352 | Diseases of the nervous system complicating pregnancy, second trimesterCMS: Diseases of the nervous sys comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.353 | Diseases of the nervous system complicating pregnancy, third trimesterCMS: Diseases of the nervous sys comp pregnancy, third trimester | Can lead a claim | A | None |
| O99.354 | Diseases of the nervous system complicating childbirth | Can lead a claim | A | None |
| O99.355 | Diseases of the nervous system complicating the puerperium | Can lead a claim | A | None |
| O99.4 Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium | ||||
| O99.41 Diseases of the circulatory system complicating pregnancy | ||||
| O99.411 | Diseases of the circulatory system complicating pregnancy, first trimesterCMS: Diseases of the circ sys comp pregnancy, first trimester | Can lead a claim | A | None |
| O99.412 | Diseases of the circulatory system complicating pregnancy, second trimesterCMS: Diseases of the circ sys comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.413 | Diseases of the circulatory system complicating pregnancy, third trimesterCMS: Diseases of the circ sys comp pregnancy, third trimester | Can lead a claim | A | None |
| O99.419 | Diseases of the circulatory system complicating pregnancy, unspecified trimesterCMS: Diseases of the circ sys comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.42 | Diseases of the circulatory system complicating childbirth | Can lead a claim | A | None |
| O99.43 | Diseases of the circulatory system complicating the puerperiumCMS: Diseases of the circ sys complicating the puerperium | Can lead a claim | A | None |
| O99.5 Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium | ||||
| O99.51 Diseases of the respiratory system complicating pregnancy | ||||
| O99.511 | Diseases of the respiratory system complicating pregnancy, first trimesterCMS: Diseases of the resp sys comp pregnancy, first trimester | Can lead a claim | A | None |
| O99.512 | Diseases of the respiratory system complicating pregnancy, second trimesterCMS: Diseases of the resp sys comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.513 | Diseases of the respiratory system complicating pregnancy, third trimesterCMS: Diseases of the resp sys comp pregnancy, third trimester | Can lead a claim | A | None |
| O99.519 | Diseases of the respiratory system complicating pregnancy, unspecified trimesterCMS: Diseases of the resp sys comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.52 | Diseases of the respiratory system complicating childbirth | Can lead a claim | A | None |
| O99.53 | Diseases of the respiratory system complicating the puerperiumCMS: Diseases of the resp sys complicating the puerperium | Can lead a claim | A | None |
| O99.6 Diseases of the digestive system complicating pregnancy, childbirth and the puerperium | ||||
| O99.61 Diseases of the digestive system complicating pregnancy | ||||
| O99.611 | Diseases of the digestive system complicating pregnancy, first trimesterCMS: Diseases of the dgstv sys comp pregnancy, first trimester | Can lead a claim | A | None |
| O99.612 | Diseases of the digestive system complicating pregnancy, second trimesterCMS: Diseases of the dgstv sys comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.613 | Diseases of the digestive system complicating pregnancy, third trimesterCMS: Diseases of the dgstv sys comp pregnancy, third trimester | Can lead a claim | A | None |
| O99.619 | Diseases of the digestive system complicating pregnancy, unspecified trimesterCMS: Diseases of the dgstv sys comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.62 | Diseases of the digestive system complicating childbirth | Can lead a claim | A | None |
| O99.63 | Diseases of the digestive system complicating the puerperium | Can lead a claim | A | None |
| O99.7 Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium | ||||
| O99.71 Diseases of the skin and subcutaneous tissue complicating pregnancy | ||||
| O99.711 | Diseases of the skin and subcutaneous tissue complicating pregnancy, first trimesterCMS: Diseases of the skin, subcu comp pregnancy, first trimester | Can lead a claim | A | None |
| O99.712 | Diseases of the skin and subcutaneous tissue complicating pregnancy, second trimesterCMS: Diseases of the skin, subcu comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.713 | Diseases of the skin and subcutaneous tissue complicating pregnancy, third trimesterCMS: Diseases of the skin, subcu comp pregnancy, third trimester | Can lead a claim | A | None |
| O99.719 | Diseases of the skin and subcutaneous tissue complicating pregnancy, unspecified trimesterCMS: Diseases of the skin, subcu comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.72 | Diseases of the skin and subcutaneous tissue complicating childbirthCMS: Diseases of the skin, subcu complicating childbirth | Can lead a claim | A | None |
| O99.73 | Diseases of the skin and subcutaneous tissue complicating the puerperiumCMS: Diseases of the skin, subcu complicating the puerperium | Can lead a claim | A | None |
| O99.8 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium | ||||
| O99.81 Abnormal glucose complicating pregnancy, childbirth and the puerperium | ||||
| O99.810 | Abnormal glucose complicating pregnancy | Can lead a claim | A | None |
| O99.814 | Abnormal glucose complicating childbirth | Can lead a claim | A | None |
| O99.815 | Abnormal glucose complicating the puerperium | Can lead a claim | A | None |
| O99.82 Streptococcus B carrier state complicating pregnancy, childbirth and the puerperium | ||||
| O99.820 | Streptococcus B carrier state complicating pregnancy | Can lead a claim | A | None |
| O99.824 | Streptococcus B carrier state complicating childbirth | Can lead a claim | A | None |
| O99.825 | Streptococcus B carrier state complicating the puerperium | Can lead a claim | A | None |
| O99.83 Other infection carrier state complicating pregnancy, childbirth and the puerperium | ||||
| O99.830 | Other infection carrier state complicating pregnancy | Can lead a claim | A | None |
| O99.834 | Other infection carrier state complicating childbirth | Can lead a claim | A | None |
| O99.835 | Other infection carrier state complicating the puerperium | Can lead a claim | A | None |
| O99.84 Bariatric surgery status complicating pregnancy, childbirth and the puerperium | ||||
| O99.840 | Bariatric surgery status complicating pregnancy, unspecified trimesterCMS: Bariatric surgery status comp pregnancy, unsp trimester | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| O99.841 | Bariatric surgery status complicating pregnancy, first trimesterCMS: Bariatric surgery status comp pregnancy, first trimester | Can lead a claim | A | None |
| O99.842 | Bariatric surgery status complicating pregnancy, second trimesterCMS: Bariatric surgery status comp pregnancy, second trimester | Can lead a claim | A | None |
| O99.843 | Bariatric surgery status complicating pregnancy, third trimesterCMS: Bariatric surgery status comp pregnancy, third trimester | Can lead a claim | A | None |
| O99.844 | Bariatric surgery status complicating childbirth | Can lead a claim | A | None |
| O99.845 | Bariatric surgery status complicating the puerperium | Can lead a claim | A | None |
| O99.89 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium | ||||
| O99.891 | Other specified diseases and conditions complicating pregnancyCMS: Oth diseases and conditions complicating pregnancy | Can lead a claim | A | None |
| O99.892 | Other specified diseases and conditions complicating childbirthCMS: Oth diseases and conditions complicating childbirth | Can lead a claim | A | None |
| O99.893 | Other specified diseases and conditions complicating puerperiumCMS: Oth diseases and conditions complicating 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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