ICD-9-CM diagnosis code (retired)
631.0 — Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early 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 631.0
631.0 is an ICD-9-CM diagnosis code for inappropriate change in quantitative human chorionic gonadotropin (hCG) in early 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 one ICD-10-CM code, O02.81 (Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early pregnancy). The match is exact.
ICD-10-CM equivalents
- O02.81Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early pregnancyexact match
Common questions about 631.0
What is the ICD-10 code for ICD-9 631.0?
- The GEMs map 631.0 to ICD-10-CM O02.81.
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.