ICD-9-CM diagnosis code (retired)
425.11 — Hypertrophic obstructive cardiomyopathy
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 425.11
425.11 is an ICD-9-CM diagnosis code for hypertrophic obstructive cardiomyopathy. 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, I42.1 (Obstructive hypertrophic cardiomyopathy). The match is exact.
ICD-10-CM equivalents
- I42.1Obstructive hypertrophic cardiomyopathyexact match
Common questions about 425.11
What is the ICD-10 code for ICD-9 425.11?
- The GEMs map 425.11 to ICD-10-CM I42.1.
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.