ICD-10 Code A66.6 – Bone and joint lesions of yaws (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A66.6 – Bone and joint lesions of yaws
What it is
A66.6 identifies bone and joint involvement caused by yaws, a chronic infectious disease. Use it when the record documents skeletal lesions attributable to yaws rather than another cause.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include bone pain, swelling, deformity, or limited joint movement when yaws affects the skeleton.
When to use this code
Use this code when the provider documents bone or joint lesions due to yaws, including chronic skeletal complications of the infection. It fits cases where the diagnosis is specific and the lesion is linked to yaws. If the chart only says suspected infection or nonspecific bone disease, check documentation before coding.
Do not use for
Do not use A66.6 for bone or joint problems from other infections, trauma, or degenerative disease. If yaws is not clearly documented as the cause, check documentation.
Coding tip
Link the skeletal finding to yaws in the record; if the cause is not explicit, query the provider.