ICD-9-CM diagnosis code (retired)
642.31 — Transient hypertension of pregnancy, delivered , with or without mention of antepartum condition
About ICD-9-CM 642.31
642.31 is an ICD-9-CM diagnosis code for transient hypertension of pregnancy, delivered , with or without mention of antepartum condition. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 7 ICD-10-CM codes, such as O13.1 (Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimester), O13.2 (Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimester) and O13.3 (Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimester). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- O13.1Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimesterapproximate
- O13.2Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimesterapproximate
- O13.3Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimesterapproximate
- O13.4Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating childbirthapproximate
- O16.1Unspecified maternal hypertension, first trimesterapproximate
- O16.2Unspecified maternal hypertension, second trimesterapproximate
- O16.3Unspecified maternal hypertension, third trimesterapproximate
Common questions about 642.31
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.