ICD-10 Code M00.269 – Other streptococcal arthritis, unspecified knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.269 – Other streptococcal arthritis, unspecified knee
What it is
This code identifies streptococcal infection of the knee joint when the organism is not otherwise specified as a particular streptococcal type. Use it for an acute infectious arthritis affecting an unspecified knee.
Clinical signs
Typical findings include a painful, swollen, warm knee with limited range of motion and joint effusion. Clinical features vary; refer to documentation and confirm the streptococcal cause when recorded.
When to use this code
Use M00.269 when the provider documents other streptococcal septic arthritis involving the knee and does not name the streptococcal species. It also fits cases where the knee laterality is not specified in the record. Check documentation if the note describes another joint or a different infectious agent.
Do not use for
Do not use this code for noninfectious arthritis, gout, or osteoarthritis. Do not assign it when the record identifies a different streptococcal species or another joint.
Coding tip
Verify that the documentation supports both streptococcal infection and knee involvement before selecting this code.