ICD-9-CM diagnosis code (retired)
765.21 — Less than 24 completed weeks of gestation
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 765.21
765.21 is an ICD-9-CM diagnosis code for less than 24 completed weeks of gestation. 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 2 ICD-10-CM codes, such as P07.21 (Extreme immaturity of newborn, gestational age less than 23 completed weeks) and P07.22 (Extreme immaturity of newborn, gestational age 23 completed weeks). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 765.21
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.