ICD-10-CM category
O40 Polyhydramnios
O40 is a category, not a billable code. Report one of the 28 complete codes below.
Codes in O40
- O40.1XX0Polyhydramnios, first trimester, not applicable or unspecified
- O40.1XX1Polyhydramnios, first trimester, fetus 1
- O40.1XX2Polyhydramnios, first trimester, fetus 2
- O40.1XX3Polyhydramnios, first trimester, fetus 3
- O40.1XX4Polyhydramnios, first trimester, fetus 4
- O40.1XX5Polyhydramnios, first trimester, fetus 5
- O40.1XX9Polyhydramnios, first trimester, other fetus
- O40.2XX0Polyhydramnios, second trimester, not applicable or unspecified
- O40.2XX1Polyhydramnios, second trimester, fetus 1
- O40.2XX2Polyhydramnios, second trimester, fetus 2
- O40.2XX3Polyhydramnios, second trimester, fetus 3
- O40.2XX4Polyhydramnios, second trimester, fetus 4
- O40.2XX5Polyhydramnios, second trimester, fetus 5
- O40.2XX9Polyhydramnios, second trimester, other fetus
- O40.3XX0Polyhydramnios, third trimester, not applicable or unspecified
- O40.3XX1Polyhydramnios, third trimester, fetus 1
- O40.3XX2Polyhydramnios, third trimester, fetus 2
- O40.3XX3Polyhydramnios, third trimester, fetus 3
- O40.3XX4Polyhydramnios, third trimester, fetus 4
- O40.3XX5Polyhydramnios, third trimester, fetus 5
- O40.3XX9Polyhydramnios, third trimester, other fetus
- O40.9XX0Polyhydramnios, unspecified trimester, not applicable or unspecified
- O40.9XX1Polyhydramnios, unspecified trimester, fetus 1
- O40.9XX2Polyhydramnios, unspecified trimester, fetus 2
- O40.9XX3Polyhydramnios, unspecified trimester, fetus 3
- O40.9XX4Polyhydramnios, unspecified trimester, fetus 4
- O40.9XX5Polyhydramnios, unspecified trimester, fetus 5
- O40.9XX9Polyhydramnios, unspecified trimester, other fetus
Outside the US? O40 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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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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