ICD-10 Code M02.859 – Other reactive arthropathies, unspecified hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.859 – Other reactive arthropathies, unspecified hip
What it is
M02.859 identifies reactive arthropathy affecting the hip when the specific hip side is not documented. Use it for joint inflammation linked to a preceding infection or other reactive process.
Clinical signs
Typical findings include hip pain, stiffness, reduced range of motion, and limp. Clinical features vary; refer to documentation for the reactive cause and whether the hip is the involved joint.
When to use this code
Use this code when the provider documents reactive arthropathy or reactive arthritis involving the hip, but does not specify right or left. It also fits records that identify the condition as “other reactive arthropathies” without further detail.
If the note names a different joint, or the hip side is stated, select the more specific code available. Check documentation when the reactive trigger or joint laterality is unclear.
Do not use for
Do not use this code for septic arthritis, osteoarthritis, or inflammatory arthritis not described as reactive. It is also incorrect when the hip side is documented and a laterality-specific code applies.
Coding tip
Look for both the reactive diagnosis and hip involvement in the provider note before assigning M02.859.