ICD-9-CM diagnosis code (retired)
633.21 — Ovarian pregnancy with intrauterine pregnancy
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 633.21
633.21 is an ICD-9-CM diagnosis code for ovarian pregnancy with intrauterine pregnancy. 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 O00.211 (Right ovarian pregnancy with intrauterine pregnancy), O00.212 (Left ovarian pregnancy with intrauterine pregnancy) and O00.219 (Unspecified ovarian pregnancy with intrauterine pregnancy). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 633.21
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.