I40: Acute myocarditis
Codes under I40 (Acute myocarditis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| I40.0 | Infective myocarditis | ✓ |
| I40.0 | Infective myocarditis | ✓ |
| I40.1 | Isolated myocarditis | ✓ |
| I40.1 | Isolated myocarditis | ✓ |
| I40.8 | Other acute myocarditis | ✓ |
| I40.8 | Other acute myocarditis | ✓ |
| I40.9 | Acute myocarditis, unspecified | ✓ |
| I40.9 | Acute myocarditis, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code I40?
I40 is an ICD-10-CM category covering Acute myocarditis. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is I40 a billable code?
No — I40 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 I40.0 — Infective myocarditis). 8 of the 8 codes under I40 are billable.
What codes fall under I40?
I40 includes I40.0, I40.0, I40.1, I40.1, I40.8, plus 3 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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