I40
Non-billableAcute myocarditis
I40 is the ICD-10-CM code for Acute myocarditis. It is a non-billable category code — use a more specific child code such as I40.0 for billing.
- Status
- Header (non-billable)
- Chapter
- I00-I99
- Subcodes
- 4
- Edition
- FY2026
I00-I99 Diseases of the circulatory system
Includes
- •subacute myocarditis
Excludes1 — not coded here
- •acute rheumatic myocarditis (I01.2)
Frequently asked questions
- What is ICD-10 code I40?
- I40 is the ICD-10-CM code for "Acute myocarditis". It falls under I00-I99 Diseases of the circulatory system.
- Is I40 a billable code?
- No — I40 is a non-billable header code. Use a more specific child code (such as I40.0) for billing.
- What is excluded from I40?
- Excludes1 (not coded here): acute rheumatic myocarditis (I01.2).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
Look up another ICD-10 code or condition