ICD-11 classes
11 Diseases of the circulatory system
Diseases of the myocardium or cardiac chambers
BC42 — Myocarditis

ICD-11 BC42 — Myocarditis

Myocarditis (inflammatory cardiomyopathy) is inflammation of the heart muscle generally in the presence of a dilated cardiomyopathy that results from exposure to either discrete infectious external antigens such as viruses, bacteria, fungae or parasites; non-infectious external antigens such as hypersensitivity to drugs; or internal non-infectious triggers such as autoimmune or hypersensitive activation against self-antigens.Additional information: The classic Dallas criteria for the pathological diagnosis of myocarditis require the presence of inflammatory cells simultaneously with evidence of myocyte necrosis on the same microscopic section when examining a myocardial biopsy. Borderline myocarditis is characterised by inflammatory cell infiltrate without myocardial necrosis. A negative biopsy does not necessarily rule out myocarditis.

The diagnosis includes nothing.

The diagnosis excludes nothing.

Diagnosis with code BC42 contains 7 clarifying diagnoses:

1. BC42.0 — Giant cell myocarditis
2. BC42.1 — Infectious myocarditis
3. BC42.2 — Hypersensitivity myocarditis
4. BC42.3 — Rheumatic myocarditis
5. 1B41.2 — Acute rheumatic myocarditis
6. BC42.Y — Other specific myocarditis
7. BC42.Z — Myocarditis, unspecified