ICD-9-CM diagnosis code (retired)
242.91 — Thyrotoxicosis without mention of goiter or other cause, with mention of thyrotoxic crisis or storm
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 242.91
242.91 is an ICD-9-CM diagnosis code for thyrotoxicosis without mention of goiter or other cause, with mention of thyrotoxic crisis or storm. 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, E05.91 (Thyrotoxicosis, unspecified with thyrotoxic crisis or storm). The match is exact.
ICD-10-CM equivalents
- E05.91Thyrotoxicosis, unspecified with thyrotoxic crisis or stormexact match
Common questions about 242.91
What is the ICD-10 code for ICD-9 242.91?
- The GEMs map 242.91 to ICD-10-CM E05.91.
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.