ICD-10-CM 2027
ICD-10 code for Myocardiopathy
From the official ICD-10-CM alphabetic index entry “Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)”. Page updated September 29, 2026.
About coding Myocardiopathy
The ICD-10-CM code for Myocardiopathy is I42.9 (Cardiomyopathy, unspecified). The official index lists 14 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I42.9.
Within I42, choose I42.9 (unspecified) only when documentation doesn't support a more specific option: dilated cardiomyopathy (I42.0), obstructive hypertrophic cardiomyopathy (I42.1), other hypertrophic cardiomyopathy (I42.2), 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) 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 Myocardiopathy codes (official index)
- alcoholic I42.6 — Alcoholic cardiomyopathy
- cobalt-beer I42.6 — Alcoholic cardiomyopathy
- glycogen storage E74.02 — Pompe disease
- hypertrophic obstructive I42.1 — Obstructive hypertrophic cardiomyopathy
- in (due to)
- beriberi E51.12 — Wet beriberi
- cardiac glycogenosis E74.02 — Pompe disease
- Friedreich's ataxia G11.11 — Friedreich ataxia
- myotonia atrophica G71.11 — Myotonic muscular dystrophy
- progressive muscular dystrophy G71.09 — Other specified muscular dystrophies
- obscure (African) I42.89 — Other cardiomyopathies not elsewhere classified
- secondary I42.9 — Cardiomyopathy, unspecified
- thyrotoxic E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
- with storm E05.91 — Thyrotoxicosis, unspecified with thyrotoxic crisis or storm
- toxic NEC I42.7 — Cardiomyopathy due to drug and external agent
Common questions about Myocardiopathy ICD-10 codes
What is the ICD-10 code for Myocardiopathy?
- I42.9 — Cardiomyopathy, unspecified. More specific codes apply when the documentation supports them: I42.6, I42.6, E74.02, I42.1 and others below.
What is the ICD-10 code for alcoholic myocardiopathy?
- I42.6 — Alcoholic cardiomyopathy.
What is the ICD-10 code for cobalt-beer myocardiopathy?
- I42.6 — Alcoholic cardiomyopathy.
What is the ICD-10 code for glycogen storage myocardiopathy?
- E74.02 — Pompe disease.
What is the ICD-10 code for hypertrophic obstructive myocardiopathy?
- I42.1 — Obstructive hypertrophic cardiomyopathy.
What is the ICD-10 code for obscure myocardiopathy?
- I42.89 — Other cardiomyopathies not elsewhere classified.
What is the ICD-10 code for secondary myocardiopathy?
- I42.9 — Cardiomyopathy, unspecified.
Is I42.9 billable?
- Yes. I42.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I42.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I42.9 as a principal diagnosis.
Is I42.9 a CC or MCC?
- I42.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.