ICD-10 Code A39.50 – Meningococcal Carditis, Unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A39.50 – Meningococcal carditis, unspecified
What it is
A39.50 identifies meningococcal infection involving the heart when the record does not specify the exact cardiac structure or type of involvement. Use it for documented meningococcal carditis without further detail.
Clinical signs
Clinical features vary; refer to documentation. Findings may include evidence of acute heart involvement occurring with meningococcal disease, such as myocarditis, pericarditis, or other carditis terminology noted by the clinician.
When to use this code
Use this code when the provider documents meningococcal carditis and does not name a more specific form. It also fits when the chart confirms meningococcal infection with cardiac involvement, but the exact site is not clarified. Check documentation if the record suggests sepsis or another primary meningococcal diagnosis.
Do not use for
Do not use this code for meningococcal disease without cardiac involvement, or for nonspecific heart disease unrelated to infection. If the documentation names a different meningococcal manifestation, code that condition instead.
Coding tip
Code the documented meningococcal manifestation first, and use A39.50 only when the carditis is specifically stated and remains unspecified.