ICD-10 Code M00.09 – Staphylococcal Polyarthritis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.09 – Staphylococcal polyarthritis
What it is
M00.09 identifies a staphylococcal infection involving multiple joints. Use it when the record documents polyarthritis caused by Staphylococcus, rather than a single infected joint.
Clinical signs
Typical findings include painful, swollen, warm joints with limited motion, and the illness may affect more than one joint at the same time. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider clearly documents staphylococcal polyarthritis or septic polyarthritis due to Staphylococcus. It is appropriate when the infection is confirmed and the joint involvement is multiple. If the organism or joint pattern is unclear, check documentation before coding.
Do not use for
Do not use it for arthritis without infection, or for a single infected joint coded as monoarthritis. Do not assume Staphylococcus if the organism is not documented.
Coding tip
Verify both the infectious organism and the multi-joint involvement in the note before assigning M00.09.