ICD-10 Code M00.261 – Other streptococcal arthritis, right knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.261 – Other streptococcal arthritis, right knee
What it is
This code identifies a streptococcal infection causing arthritis in the right knee. Use it when the documentation specifies streptococcal arthritis and the affected joint is the right knee.
Clinical signs
Typical findings include a painful, swollen, warm knee with reduced range of motion. Clinical features vary; refer to documentation for the organism and joint involved.
When to use this code
Use M00.261 when the provider documents other streptococcal arthritis affecting the right knee, including septic arthritis due to a streptococcal species not otherwise specified elsewhere. Confirm laterality and infectious cause in the note before coding.
Do not use for
Do not use this code for noninfectious arthritis, unspecified knee arthritis, or streptococcal infection without joint involvement. Check documentation if the organism or right-knee laterality is not stated.
Coding tip
Link the diagnosis to the documented streptococcal organism and the right knee; if either element is missing, query the provider.