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ICD-9-CM diagnosis code (retired)

651.01 — Twin pregnancy, 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 651.01

651.01 is an ICD-9-CM diagnosis code for twin 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 3 ICD-10-CM codes, such as O30.001 (Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester), O30.002 (Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester) and O30.003 (Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester). All of these are approximate matches, so review the record to pick the right one.

ICD-10-CM equivalents

Common questions about 651.01

What is the ICD-10 code for ICD-9 651.01?

The GEMs map 651.01 to ICD-10-CM O30.001, O30.002 and O30.003.

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.