ICD-10 Code M02.869 – Other reactive arthropathies, unspecified knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.869 – Other reactive arthropathies, unspecified knee
What it is
M02.869 identifies a reactive arthropathy affecting the knee when the specific knee side is not documented. It is used for joint inflammation that occurs in association with another condition, but the chart does not specify a more exact reactive arthritis type.
Clinical signs
Typical findings include knee pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for the underlying trigger, laterality, and whether the presentation is acute or chronic.
When to use this code
Use this code when the provider documents reactive arthropathy or reactive arthritis involving the knee, but does not identify the knee as right or left. It also fits cases where the note supports a reactive joint process and no more specific code is available. Confirm the diagnosis and laterality in the record before assigning it.
Do not use for
Do not use it for septic arthritis, osteoarthritis, or nonspecific knee pain without a documented reactive arthropathy. If the knee side is documented, choose the appropriate more specific code.
Coding tip
Check the note for laterality and the linked underlying condition, because both may affect code selection.