ICD-10 Code M02.862 – Other reactive arthropathies, left knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.862 – Other reactive arthropathies, left knee
What it is
M02.862 identifies reactive arthropathy affecting the left knee. It is used when joint inflammation is linked to a reactive process rather than primary arthritis.
Clinical signs
Typical findings include knee pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for evidence of a reactive arthropathy and left-knee involvement.
When to use this code
Use this code when the record clearly documents other reactive arthropathy in the left knee. The documentation should support a reactive, postinfectious, or otherwise specified arthropathy rather than an unrelated joint disorder. Verify laterality and the “other” reactive arthropathy designation before assigning the code.
Do not use for
Do not use it for unspecified knee pain, osteoarthritis, rheumatoid arthritis, or gout unless the provider documents reactive arthropathy. Check documentation if the knee diagnosis is not clearly identified.
Coding tip
Confirm both the reactive arthropathy diagnosis and left-sided laterality in the note before coding M02.862.