ICD-10 Code A39.52 – Meningococcal Myocarditis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A39.52 – Meningococcal myocarditis
What it is
A39.52 identifies myocarditis caused by meningococcal infection. Use it when the record documents inflammation of the heart muscle due to Neisseria meningitidis.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include evidence of acute myocarditis alongside confirmed meningococcal disease, such as chest pain, arrhythmia, heart failure, or cardiac dysfunction.
When to use this code
Use this code when the clinician specifically links myocarditis to meningococcal infection. It is appropriate for discharge summaries, problem lists, or encounter notes that clearly document “meningococcal myocarditis.” If the cause is not stated, check documentation before coding.
Do not use for
Do not use this code for myocarditis from other infectious or noninfectious causes. Do not assign it when meningococcal disease is present without documented cardiac involvement.
Coding tip
Verify that both meningococcal infection and myocarditis are documented together, with a causal link when available.