ICD-10 Code A18.8 – Tuberculosis of other specified organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A18.8 – Tuberculosis of other specified organs
What it is
This code identifies tuberculosis infection involving an organ or site other than the lungs, lymph nodes, bones, or other more specifically named locations. Use it when documentation names a nonpulmonary organ affected by TB and no more specific code is available.
Clinical signs
Clinical features vary by organ involved and may include localized inflammation, pain, swelling, or dysfunction. Confirming documentation usually mentions tuberculosis at an unusual site; if the site is unclear, refer to documentation.
When to use this code
Use A18.8 when the provider documents tuberculosis in another specified organ, such as a site not separately indexed in ICD-10-CM. You should code it when the record supports extrapulmonary TB but does not fit a more specific category. If the chart names the exact organ, verify whether a more precise code exists.
Do not use for
Do not use this code for pulmonary tuberculosis or for TB in organs with their own more specific ICD-10-CM code. Do not assign it when documentation only says “TB” without specifying an organ; check documentation.
Coding tip
Review the full note for the exact anatomic site before coding, because a more specific tuberculosis code may apply.