ICD-9-CM diagnosis code (retired)
331.81 — Reye's syndrome
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 331.81
331.81 is an ICD-9-CM diagnosis code for Reye's syndrome. 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, G93.7 (Reye's syndrome). The match is exact.
ICD-10-CM equivalents
- G93.7Reye's syndromeexact match
Common questions about 331.81
What is the ICD-10 code for ICD-9 331.81?
- The GEMs map 331.81 to ICD-10-CM G93.7.
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.