ICD-10-CM diagnosis code
O99.342 Other mental disorders complicating pregnancy, second trimester
- Billable
- Yes, a complete code (FY2026)
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Other codes in O99
96 complete codes in this category.
- 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
Documentation tips
- Make sure the note supports every element of the title, “Other mental disorders complicating pregnancy, second trimester”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to O99.
The international WHO ICD-10 also has O99, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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