ICD-10-CM 2027
ICD-10 code for dilated cardiomyopathy
From the official ICD-10-CM alphabetic index entry “Cardiomyopathy (familial) (idiopathic) › dilated”. Page updated September 29, 2026.
About coding dilated cardiomyopathy
The ICD-10-CM code for dilated cardiomyopathy is I42.00 (Dilated cardiomyopathy, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I42.00.
Within I42.0, choose I42.00 (unspecified) only when documentation doesn't support a more specific option: Familial-genetic dilated cardiomyopathy (I42.01) and other dilated cardiomyopathy (I42.09).
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 dilated cardiomyopathy codes (official index)
Common questions about dilated cardiomyopathy ICD-10 codes
What is the ICD-10 code for dilated cardiomyopathy?
- I42.00 — Dilated cardiomyopathy, unspecified. More specific codes apply when the documentation supports them: I42.01, I42.09.
What is the ICD-10 code for familial-genetic dilated cardiomyopathy?
- I42.01 — Familial-genetic dilated cardiomyopathy.
Is I42.00 billable?
- Yes. I42.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I42.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I42.00 as a principal diagnosis.
Is I42.00 a CC or MCC?
- I42.00 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.