ICD-10 Code A15.4 – Tuberculosis of intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A15.4 – Tuberculosis of intrathoracic lymph nodes
What it is
This code identifies active tuberculosis involving lymph nodes inside the chest, such as hilar or mediastinal nodes. Use it when documentation clearly states intrathoracic lymph node tuberculosis.
Clinical signs
Clinical features vary; refer to documentation. Patients may have chest-related symptoms or imaging findings suggesting lymph node involvement, but the diagnosis should be supported by provider documentation or accepted TB evaluation.
When to use this code
Use A15.4 when the record specifies tuberculosis of intrathoracic lymph nodes as an active diagnosis. It is appropriate for confirmed pulmonary or extrapulmonary TB cases where the chest lymph nodes are the documented site. If the site is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for latent TB infection or for tuberculosis limited to other organs. If the chart only says “TB exposure” or does not identify intrathoracic lymph nodes, check documentation.
Coding tip
Assign the code only when the provider documents intrathoracic lymph node involvement, and verify any additional TB site or activity codes as needed.