ICD-9-CM diagnosis code (retired)
661.21 — Other and unspecified uterine inertia, 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 661.21
661.21 is an ICD-9-CM diagnosis code for other and unspecified uterine inertia, 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 one ICD-10-CM code, O62.2 (Other uterine inertia). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- O62.2Other uterine inertiaapproximate
Common questions about 661.21
What is the ICD-10 code for ICD-9 661.21?
- The GEMs map 661.21 to ICD-10-CM O62.2.
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.