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  1. ICD.Codes
  2. ICD-10-CM (2016)
  3. Chapter 9
  4. Section I30-I52
  5. Code I42.1

ICD-10-CM Code I42.1
Obstructive hypertrophic cardiomyopathy

BILLABLE
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

I42.1 is a billable ICD code used to specify a diagnosis of obstructive hypertrophic cardiomyopathy. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code I421 is used to code Hypertrophic cardiomyopathy

Hypertrophic cardiomyopathy (HCM) is a primary disease of the myocardium (the muscle of the heart) in which a portion of the myocardium is hypertrophied (thickened) without any obvious cause, creating functional impairment of the cardiac muscle. It is a leading cause of sudden cardiac death in young athletes. The occurrence of hypertrophic cardiomyopathy is a significant cause of sudden unexpected cardiac death in any age group and as a cause of disabling cardiac symptoms. Younger people are likely to have a more severe form of hypertrophic cardiomyopathy.

Specialty: Cardiology
MeSH Code: D002312
ICD 9 Code: 425.1

Source: Wikipedia

Coding Notes for I42.1 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Hypertrophic subaortic stenosis (idiopathic)

MS-DRG Mapping

  • DRG Group #314-316 - Other circulatory system diagnoses with MCC.
  • DRG Group #314-316 - Other circulatory system diagnoses with CC.
  • DRG Group #314-316 - Other circulatory system diagnoses without CC or MCC.

ICD-10-CM Alphabetical Index References for 'I42.1 - Obstructive hypertrophic cardiomyopathy'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code I42.1. Click on any term below to browse the alphabetical index.

Stenosis, stenotic(cicatricial) (see: Stricture) +
Myocardiopathy(congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic) (see: Cardiomyopathy) +
Stricture (see: Stenosis) +
Cardiomyopathy(familial) (idiopathic) +

Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)

425.11
Hypertrophic obstructive cardiomyopathy (exact match)

This is the official exact match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that in all cases where the ICD9 code 425.11 was previously used, I42.1 is the appropriate modern ICD10 code.

Parent Code: I42 - Cardiomyopathy

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/I421