I42.1

Obstructive hypertrophic cardiomyopathy

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC227

Cardiomyopathy/Myocarditis

CMS-HCC ESRD V24

HCC85

Congestive Heart Failure

RxHCC V08

RXHCC186

Heart Failure

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · I42.1

Synonyms

Hypertrophic subaortic stenosis (idiopathic)

Inherited from I42Cardiomyopathy

Includes

myocardiopathy

Excludes 2

ischemic cardiomyopathy (I25.5) peripartum cardiomyopathy (O90.3) ventricular hypertrophy (I51.7)

Code first

pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)

Inherited from chapter 9Diseases of the circulatory system

Excludes 2

certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) systemic connective tissue disorders (M30-M36) transient cerebral ischemic attacks and related syndromes (G45.-)

Official Guidelines for I42.1

FY 2026 ›

I.C.9Chapter-specific guidanceChapter 9: Diseases of the Circulatory System (I00-I99)

Subsections

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