ICD-10 Code M02.861 – Other reactive arthropathies, right knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.861 – Other reactive arthropathies, right knee
What it is
This code identifies reactive arthropathy affecting the right knee. It is used when joint inflammation is linked to a prior infection or other reactive process, rather than primary arthritis.
Clinical signs
Typical findings include right knee pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for evidence of a reactive pattern or associated preceding infection.
When to use this code
Use this code when the record specifically documents other reactive arthropathy in the right knee. It fits cases where the provider links the knee inflammation to a reactive cause and identifies the right side. If the laterality or reactive nature is not stated, check documentation.
Do not use for
Do not use it for nonspecific knee pain, osteoarthritis, gout, or septic arthritis. Also avoid it when the chart does not clearly identify the condition as reactive arthropathy of the right knee.
Coding tip
Confirm both the reactive diagnosis and right-knee laterality before assigning M02.861.