ICD-10-CM 2027
ICD-10 code for hypertrophic nonobstructive cardiomyopathy
From the official ICD-10-CM alphabetic index entry “Cardiomyopathy (familial) (idiopathic) › hypertrophic (nonobstructive)”. Page updated September 29, 2026.
About coding hypertrophic nonobstructive cardiomyopathy
The ICD-10-CM code for hypertrophic nonobstructive cardiomyopathy is I42.2 (Other hypertrophic cardiomyopathy). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I42.2.
Within I42, choose I42.2 (Other hypertrophic cardiomyopathy) only when documentation doesn't support a more specific option: dilated cardiomyopathy (I42.0), obstructive hypertrophic cardiomyopathy (I42.1), Endomyocardial (eosinophilic) disease (I42.3), endocardial fibroelastosis (I42.4), other restrictive cardiomyopathy (I42.5), alcoholic cardiomyopathy (I42.6), due to drug and external agent (I42.7), other cardiomyopathies (I42.8) and 1 more.
Code first: pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific hypertrophic nonobstructive cardiomyopathy codes (official index)
Common questions about hypertrophic nonobstructive cardiomyopathy ICD-10 codes
What is the ICD-10 code for hypertrophic nonobstructive cardiomyopathy?
- I42.2 — Other hypertrophic cardiomyopathy. More specific codes apply when the documentation supports them: I42.1, Q24.8.
What is the ICD-10 code for obstructive hypertrophic nonobstructive cardiomyopathy?
- I42.1 — Obstructive hypertrophic cardiomyopathy.
Is I42.2 billable?
- Yes. I42.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I42.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I42.2 as a principal diagnosis.
Is I42.2 a CC or MCC?
- I42.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.