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ICD-9-CM diagnosis code (retired)

656.91 — Unspecified fetal and placental problem, affecting management of mother, delivered, with or without mention of antepartum condition

ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.

About ICD-9-CM 656.91

656.91 is an ICD-9-CM diagnosis code for unspecified fetal and placental problem, affecting management of mother, 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 3 ICD-10-CM codes, such as O36.91X0 (Maternal care for fetal problem, unspecified, first trimester, not applicable or unspecified), O36.92X0 (Maternal care for fetal problem, unspecified, second trimester, not applicable or unspecified) and O36.93X0 (Maternal care for fetal problem, unspecified, third trimester, not applicable or unspecified). All of these are approximate matches, so review the record to pick the right one.

ICD-10-CM equivalents

Common questions about 656.91

What is the ICD-10 code for ICD-9 656.91?

The GEMs map 656.91 to ICD-10-CM O36.91X0, O36.92X0 and O36.93X0.

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.