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ICD-10-CM category O99: Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Category O99 is a heading in chapter 15 (Pregnancy, childbirth and the puerperium (O00-O9A)), section Other obstetric conditions, not elsewhere classified (O94-O9A). It is not billable; report one of the 96 complete codes below.

Notes that apply to every O99 code

Includes
  • conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
Excludes2 (not part of this condition, may be coded together)
  • when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
Use additional code
  • code to identify specific condition

Billable codes in O99

Billable FY2027 ICD-10-CM codes in category O99
CodeDescription
O99.011Anemia complicating pregnancy, first trimester
O99.012Anemia complicating pregnancy, second trimester
O99.013Anemia complicating pregnancy, third trimester
O99.019Anemia complicating pregnancy, unspecified trimester
O99.02Anemia complicating childbirth
O99.03Anemia complicating the puerperium
O99.111Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, first trimester
O99.112Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, second trimester
O99.113Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, third trimester
O99.119Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, unspecified trimester
O99.12Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth
O99.13Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating the puerperium
O99.210Obesity complicating pregnancy, unspecified trimester
O99.211Obesity complicating pregnancy, first trimester
O99.212Obesity complicating pregnancy, second trimester
O99.213Obesity complicating pregnancy, third trimester
O99.214Obesity complicating childbirth
O99.215Obesity complicating the puerperium
O99.280Endocrine, nutritional and metabolic diseases complicating pregnancy, unspecified trimester
O99.281Endocrine, nutritional and metabolic diseases complicating pregnancy, first trimester
O99.282Endocrine, nutritional and metabolic diseases complicating pregnancy, second trimester
O99.283Endocrine, nutritional and metabolic diseases complicating pregnancy, third trimester
O99.284Endocrine, nutritional and metabolic diseases complicating childbirth
O99.285Endocrine, nutritional and metabolic diseases complicating the puerperium
O99.310Alcohol use complicating pregnancy, unspecified trimester
O99.311Alcohol use complicating pregnancy, first trimester
O99.312Alcohol use complicating pregnancy, second trimester
O99.313Alcohol use complicating pregnancy, third trimester
O99.314Alcohol use complicating childbirth
O99.315Alcohol use complicating the puerperium
O99.320Drug use complicating pregnancy, unspecified trimester
O99.321Drug use complicating pregnancy, first trimester
O99.322Drug use complicating pregnancy, second trimester
O99.323Drug use complicating pregnancy, third trimester
O99.324Drug use complicating childbirth
O99.325Drug use complicating the puerperium
O99.330Smoking (tobacco) complicating pregnancy, unspecified trimester
O99.331Smoking (tobacco) complicating pregnancy, first trimester
O99.332Smoking (tobacco) complicating pregnancy, second trimester
O99.333Smoking (tobacco) complicating pregnancy, third trimester
O99.334Smoking (tobacco) complicating childbirth
O99.335Smoking (tobacco) complicating the puerperium
O99.340Other mental disorders complicating pregnancy, unspecified trimester
O99.341Other mental disorders complicating pregnancy, first trimester
O99.342Other mental disorders complicating pregnancy, second trimester
O99.343Other mental disorders complicating pregnancy, third trimester
O99.344Other mental disorders complicating childbirth
O99.345Other mental disorders complicating the puerperium
O99.350Diseases of the nervous system complicating pregnancy, unspecified trimester
O99.351Diseases of the nervous system complicating pregnancy, first trimester
O99.352Diseases of the nervous system complicating pregnancy, second trimester
O99.353Diseases of the nervous system complicating pregnancy, third trimester
O99.354Diseases of the nervous system complicating childbirth
O99.355Diseases of the nervous system complicating the puerperium
O99.411Diseases of the circulatory system complicating pregnancy, first trimester
O99.412Diseases of the circulatory system complicating pregnancy, second trimester
O99.413Diseases of the circulatory system complicating pregnancy, third trimester
O99.419Diseases of the circulatory system complicating pregnancy, unspecified trimester
O99.42Diseases of the circulatory system complicating childbirth
O99.43Diseases of the circulatory system complicating the puerperium
O99.511Diseases of the respiratory system complicating pregnancy, first trimester
O99.512Diseases of the respiratory system complicating pregnancy, second trimester
O99.513Diseases of the respiratory system complicating pregnancy, third trimester
O99.519Diseases of the respiratory system complicating pregnancy, unspecified trimester
O99.52Diseases of the respiratory system complicating childbirth
O99.53Diseases of the respiratory system complicating the puerperium
O99.611Diseases of the digestive system complicating pregnancy, first trimester
O99.612Diseases of the digestive system complicating pregnancy, second trimester
O99.613Diseases of the digestive system complicating pregnancy, third trimester
O99.619Diseases of the digestive system complicating pregnancy, unspecified trimester
O99.62Diseases of the digestive system complicating childbirth
O99.63Diseases of the digestive system complicating the puerperium
O99.711Diseases of the skin and subcutaneous tissue complicating pregnancy, first trimester
O99.712Diseases of the skin and subcutaneous tissue complicating pregnancy, second trimester
O99.713Diseases of the skin and subcutaneous tissue complicating pregnancy, third trimester
O99.719Diseases of the skin and subcutaneous tissue complicating pregnancy, unspecified trimester
O99.72Diseases of the skin and subcutaneous tissue complicating childbirth
O99.73Diseases of the skin and subcutaneous tissue complicating the puerperium
O99.810Abnormal glucose complicating pregnancy
O99.814Abnormal glucose complicating childbirth
O99.815Abnormal glucose complicating the puerperium
O99.820Streptococcus B carrier state complicating pregnancy
O99.824Streptococcus B carrier state complicating childbirth
O99.825Streptococcus B carrier state complicating the puerperium
O99.830Other infection carrier state complicating pregnancy
O99.834Other infection carrier state complicating childbirth
O99.835Other infection carrier state complicating the puerperium
O99.840Bariatric surgery status complicating pregnancy, unspecified trimester
O99.841Bariatric surgery status complicating pregnancy, first trimester
O99.842Bariatric surgery status complicating pregnancy, second trimester
O99.843Bariatric surgery status complicating pregnancy, third trimester
O99.844Bariatric surgery status complicating childbirth
O99.845Bariatric surgery status complicating the puerperium
O99.891Other specified diseases and conditions complicating pregnancy
O99.892Other specified diseases and conditions complicating childbirth
O99.893Other specified diseases and conditions complicating puerperium

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Codes from the FY2027 ICD-10-CM files (all chapters). Report the code that matches the documentation and the Official Guidelines; this list is not coding advice.