ICD-10 Code A18.84 – Tuberculosis of heart (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A18.84 – Tuberculosis of heart
What it is
A18.84 identifies tuberculosis involving the heart. Use it when documentation shows cardiac infection due to Mycobacterium tuberculosis, such as tuberculous myocarditis, pericarditis, or other specified heart involvement.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include chest discomfort, dyspnea, arrhythmia, or signs of pericardial disease when the heart is affected by tuberculosis.
When to use this code
Use this code when the provider clearly documents tuberculosis of the heart or a specific cardiac site due to TB. It is appropriate for confirmed cardiac involvement, not for suspected disease or nonspecific TB elsewhere. If the record only states disseminated tuberculosis without heart involvement, check documentation.
Do not use for
Do not use A18.84 for pulmonary tuberculosis, latent TB, or tuberculosis of other organs unless the heart is specifically involved. Check documentation if the record does not clearly identify cardiac infection.
Coding tip
Confirm the exact cardiac site and the provider’s causal wording before assigning A18.84.