ICD-10 Code M02.879 – Other reactive arthropathies, unspecified ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.879 – Other reactive arthropathies, unspecified ankle and foot
What it is
This code identifies a reactive arthropathy affecting the ankle and foot when the specific ankle or foot site is not further documented. It reflects joint inflammation that occurs in association with a preceding infection or other reactive process.
Clinical signs
Typical findings include joint pain, swelling, stiffness, and reduced range of motion in the ankle or foot. Clinical features vary; refer to documentation for the linked trigger, laterality, and whether the condition is acute or chronic.
When to use this code
Use M02.879 when the provider documents reactive arthropathy or reactive arthritis involving the ankle or foot, but does not specify a more exact joint site. It is appropriate when the record supports a postinfectious inflammatory joint process and the ankle/foot location is clear. If the documentation names a different reactive arthropathy subtype, code that diagnosis instead.
Do not use for
Do not use this code for septic arthritis, gout, rheumatoid arthritis, or nonspecific ankle pain without a documented reactive arthropathy. Check documentation if the joint diagnosis is unclear or if another inflammatory arthropathy is named.
Coding tip
Confirm the reactive cause and the exact joint location in the note before assigning M02.879.