ICD-10 Code A18.89 – Tuberculosis of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A18.89 – Tuberculosis of other sites
What it is
This code identifies tuberculosis infection affecting a site not named by a more specific ICD-10 code. Use it when documentation confirms TB, but the anatomic location is described only as “other” or is not otherwise classified.
Clinical signs
Clinical features vary by involved site and may include chronic inflammation, localized pain, swelling, or drainage. Confirmed tuberculosis evidence and a documented non-specified site are the key coding points; check documentation.
When to use this code
Use A18.89 when the record clearly states tuberculosis at an unusual or unspecified site and no more specific code applies. It is appropriate when the provider documents extrapulmonary TB without naming a coded organ system. If the site is later clarified, code the more specific diagnosis instead.
Do not use for
Do not use this code for pulmonary tuberculosis, miliary tuberculosis, or TB of a site with its own specific ICD-10 code. Do not use it when documentation only says “suspected TB” without confirmation.
Coding tip
Verify the exact anatomic site in the note before assigning A18.89, because a more specific TB code may be available.