ICD-10 Code A18.09 – Other musculoskeletal tuberculosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A18.09 – Other musculoskeletal tuberculosis
What it is
A18.09 identifies tuberculosis infection involving musculoskeletal tissues other than the more specific sites named elsewhere. Use it when documentation shows TB affecting bone, joint, tendon, or related structures, but not a site with its own code.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include localized pain, swelling, reduced range of motion, or chronic destructive changes consistent with musculoskeletal tuberculosis.
When to use this code
Use A18.09 when the provider documents tuberculosis in a musculoskeletal site that is not otherwise specified by a more detailed ICD-10 code. It may apply to confirmed extrapulmonary TB with bone or joint involvement. If the record names a more specific anatomic site, code that diagnosis instead.
Do not use for
Do not use this code for pulmonary tuberculosis or for musculoskeletal disorders without documented tuberculosis. If the chart identifies a more specific musculoskeletal TB code, check documentation and code the precise site.
Coding tip
Look for the exact anatomic site in the record before choosing A18.09; use the most specific TB code supported by documentation.