ICD-10-CM › I00-I99 › I30-I5A › I42 Cardiomyopathy › I42.1

I42.1

Obstructive hypertrophic cardiomyopathy

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

What has happened to this code

Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2007 Added to the draft code set draft Obstructive hypertrophic cardiomyopathy

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from I42 Cardiomyopathy

Excludes2 - not included here

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

Code first

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

Includes

  • myocardiopathy

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Codes in the same group

CodeDescriptionStatus
I42.0 Dilated cardiomyopathy Not billable
I42.2 Other hypertrophic cardiomyopathy Valid
I42.3 Endomyocardial (eosinophilic) disease Valid
I42.4 Endocardial fibroelastosis Valid
I42.5 Other restrictive cardiomyopathy Valid
I42.6 Alcoholic cardiomyopathy Valid
I42.7 Cardiomyopathy due to drug and external agent Valid
I42.8 Other cardiomyopathies Not billable
I42.9 Cardiomyopathy, unspecified Valid