ICD-9-CM diagnosis code (retired)
991.1 — Frostbite of hand
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 991.1
991.1 is an ICD-9-CM diagnosis code for frostbite of hand. 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 T33.529A (Superficial frostbite of unspecified hand, initial encounter) and T34.529A (Frostbite with tissue necrosis of unspecified hand, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 991.1
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.