ICD-9-CM diagnosis code (retired)
255.0 — Cushing'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 255.0
255.0 is an ICD-9-CM diagnosis code for Cushing'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 5 ICD-10-CM codes, such as E24.0 (Pituitary-dependent Cushing's disease), E24.2 (Drug-induced Cushing's syndrome) and E24.3 (Ectopic ACTH syndrome). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 255.0
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.