ICD-9-CM diagnosis code (retired)
646.13 — Edema or excessive weight gain in pregnancy, without mention of hypertension, antepartum condition or complication
About ICD-9-CM 646.13
646.13 is an ICD-9-CM diagnosis code for edema or excessive weight gain in pregnancy, without mention of hypertension, antepartum condition or complication. 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 9 ICD-10-CM codes, such as O12.01 (Gestational edema, first trimester), O12.02 (Gestational edema, second trimester) and O12.03 (Gestational edema, third trimester). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- O12.01Gestational edema, first trimesterapproximate
- O12.02Gestational edema, second trimesterapproximate
- O12.03Gestational edema, third trimesterapproximate
- O12.21Gestational edema with proteinuria, first trimesterapproximate
- O12.22Gestational edema with proteinuria, second trimesterapproximate
- O12.23Gestational edema with proteinuria, third trimesterapproximate
- O26.01Excessive weight gain in pregnancy, first trimesterapproximate
- O26.02Excessive weight gain in pregnancy, second trimesterapproximate
- O26.03Excessive weight gain in pregnancy, third trimesterapproximate
Common questions about 646.13
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.