ICD-10-CM 2027 diagnosis code
O99.3Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium
O99.3 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.Short description: Mental disord and dis of the nervous sys compl preg/chldbrth
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About O99.3
O99.3 is the ICD-10-CM diagnosis code for mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium. It belongs to category O99 (other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium), block O94-O9A (other obstetric conditions, not elsewhere classified) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.
Within O99 (other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium), O99.3 is specifically for mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium. Related codes cover anemia complicating pregnancy, childbirth and the puerperium (O99.0), other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium (O99.1), endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium (O99.2), diseases of the circulatory system complicating pregnancy, childbirth and the puerperium (O99.4), diseases of the respiratory system complicating pregnancy, childbirth and the puerperium (O99.5), diseases of the digestive system complicating pregnancy, childbirth and the puerperium (O99.6), diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium (O99.7) and other specified diseases and conditions complicating pregnancy, childbirth and the puerperium (O99.8).
To report this condition, pick the subcode that matches the documentation: O99.31 (puerperium), O99.32 (puerperium), O99.33 (puerperium), O99.34 (puerperium) and O99.35 (puerperium).
Use an additional code to identify specific condition.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under O99.3
- O99.31Alcohol use complicating pregnancy, childbirth, and the puerperium
- O99.310Alcohol use complicating pregnancy, unspecified trimesterBillable
- O99.311Alcohol use complicating pregnancy, first trimesterBillable
- O99.312Alcohol use complicating pregnancy, second trimesterBillable
- O99.313Alcohol use complicating pregnancy, third trimesterBillable
- O99.314Alcohol use complicating childbirthBillable
- O99.315Alcohol use complicating the puerperiumBillable
- O99.32Drug use complicating pregnancy, childbirth, and the puerperium
- O99.320Drug use complicating pregnancy, unspecified trimesterBillable
- O99.321Drug use complicating pregnancy, first trimesterBillable
- O99.322Drug use complicating pregnancy, second trimesterBillable
- O99.323Drug use complicating pregnancy, third trimesterBillable
- O99.324Drug use complicating childbirthBillable
- O99.325Drug use complicating the puerperiumBillable
- O99.33Tobacco use disorder complicating pregnancy, childbirth, and the puerperium
- O99.330Smoking (tobacco) complicating pregnancy, unspecified trimesterBillable
- O99.331Smoking (tobacco) complicating pregnancy, first trimesterBillable
- O99.332Smoking (tobacco) complicating pregnancy, second trimesterBillable
- O99.333Smoking (tobacco) complicating pregnancy, third trimesterBillable
- O99.334Smoking (tobacco) complicating childbirthBillable
- O99.335Smoking (tobacco) complicating the puerperiumBillable
- O99.34Other mental disorders complicating pregnancy, childbirth, and the puerperium
- O99.340Other mental disorders complicating pregnancy, unspecified trimesterBillable
- O99.341Other mental disorders complicating pregnancy, first trimesterBillable
- O99.342Other mental disorders complicating pregnancy, second trimesterBillable
- O99.343Other mental disorders complicating pregnancy, third trimesterBillable
- O99.344Other mental disorders complicating childbirthBillable
- O99.345Other mental disorders complicating the puerperiumBillable
- O99.35Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium
- O99.350Diseases of the nervous system complicating pregnancy, unspecified trimesterBillable
- O99.351Diseases of the nervous system complicating pregnancy, first trimesterBillable
- O99.352Diseases of the nervous system complicating pregnancy, second trimesterBillable
- O99.353Diseases of the nervous system complicating pregnancy, third trimesterBillable
- O99.354Diseases of the nervous system complicating childbirthBillable
- O99.355Diseases of the nervous system complicating the puerperiumBillable
Notes that apply from higher levels
Instructions written at a parent level also apply to O99.3.
› From O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
- conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
- code to identify specific condition
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about O99.3
Is O99.3 billable?
- No. O99.3 is a header code. Report one of its more specific subcodes instead.