I40.1 — Isolated myocarditis
I40.1 is a billable, specific ICD-10-CM code for isolated myocarditis. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Fiedler's myocarditis
- Giant cell myocarditis
- Idiopathic myocarditis
Risk adjustment
I40.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
I40.1 is named in 14 Medicare coverage policies — 14 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A56500Billing and Coding: Cardiac Catheterization and Coronary Angiography
How I40.1 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I40.1.
- Abramov-Fiedler myocarditis(acute isolated myocarditis)
- Fiedler's›myocarditis(acute)
- Myocarditis›eosinophilic
- Myocarditis›Fiedler's(acute) (isolated)
- Myocarditis›giant cell(acute) (subacute)
- Myocarditis›granulomatous(idiopathic) (isolated) (nonspecific)
- Myocarditis›idiopathic(granulomatous)
- Myocarditis›isolated(acute)
- Syndrome›Fiedler's
- Myocarditis›acute or subacute›idiopathic
Related codes at this level
Codes that share I40. If I40.1 is not quite right, the correct code is usually one of these.
Questions about I40.1
- Is I40.1 a billable ICD-10-CM code?
- Yes. I40.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I40.1 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).