I42: Cardiomyopathy
Codes under I42 (Cardiomyopathy). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| I42.0 | Dilated cardiomyopathy | ✓ |
| I42.0 | Dilated cardiomyopathy | — |
| I42.00 | Dilated cardiomyopathy, unspecified | ✓ |
| I42.01 | Familial-genetic dilated cardiomyopathy | ✓ |
| I42.1 | Obstructive hypertrophic cardiomyopathy | ✓ |
| I42.1 | Obstructive hypertrophic cardiomyopathy | ✓ |
| I42.2 | Other hypertrophic cardiomyopathy | ✓ |
| I42.2 | Other hypertrophic cardiomyopathy | ✓ |
| I42.3 | Endomyocardial (eosinophilic) disease | ✓ |
| I42.3 | Endomyocardial (eosinophilic) disease | ✓ |
| I42.4 | Endocardial fibroelastosis | ✓ |
| I42.4 | Endocardial fibroelastosis | ✓ |
| I42.5 | Other restrictive cardiomyopathy | ✓ |
| I42.5 | Other restrictive cardiomyopathy | ✓ |
| I42.6 | Alcoholic cardiomyopathy | ✓ |
| I42.6 | Alcoholic cardiomyopathy | ✓ |
| I42.7 | Cardiomyopathy due to drug and external agent | ✓ |
| I42.7 | Cardiomyopathy due to drug and external agent | ✓ |
| I42.8 | Other cardiomyopathies | ✓ |
| I42.8 | Other cardiomyopathies | — |
| I42.09 | Other dilated cardiomyopathy | ✓ |
| I42.9 | Cardiomyopathy, unspecified | ✓ |
| I42.9 | Cardiomyopathy, unspecified | ✓ |
| I42.81 | Arrhythmogenic cardiomyopathy | ✓ |
| I42.89 | Other cardiomyopathies not elsewhere classified | ✓ |
Frequently asked questions
What is ICD-10-CM code I42?
I42 is an ICD-10-CM category covering Cardiomyopathy. It contains 25 more specific diagnosis codes, 23 of which are billable.
Is I42 a billable code?
No — I42 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example I42.0 — Dilated cardiomyopathy). 23 of the 25 codes under I42 are billable.
What codes fall under I42?
I42 includes I42.0, I42.0, I42.00, I42.01, I42.1, plus 20 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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