ICD-10 Code A15.0 – Tuberculosis of lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A15.0 – Tuberculosis of lung
What it is
A15.0 identifies active tuberculosis involving the lung. Use it when the record specifies pulmonary TB rather than infection at another site or a latent TB state.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include persistent cough, fever, night sweats, weight loss, and abnormal chest imaging consistent with pulmonary infection.
When to use this code
Use A15.0 when the provider documents tuberculosis of the lung, pulmonary TB, or tuberculous pneumonia affecting the lungs. It is appropriate when the diagnosis is confirmed or clearly stated in the chart. Check documentation if the record only mentions exposure, screening, or latent infection.
Do not use for
Do not use A15.0 for latent tuberculosis infection or a positive TB test without active disease. Also avoid it when the infection is documented in another organ system rather than the lung.
Coding tip
Verify that the documentation states active pulmonary tuberculosis before assigning A15.0.