ICD-10 Code M01.X61 – Direct infection of right knee in infectious and parasitic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M01.X61 – Direct infection of right knee in infectious and parasitic diseases classified elsewhere
What it is
This code identifies a direct infectious joint involvement of the right knee when the underlying infectious or parasitic disease is classified elsewhere. Use it when the knee infection is linked to another documented condition, not coded here.
Clinical signs
Typical findings include a painful, swollen, warm right knee with reduced range of motion. Clinical features vary; refer to documentation for evidence of infection and the associated causative disease.
When to use this code
Use M01.X61 when the record shows direct infection of the right knee and the provider links it to an infectious or parasitic disease coded elsewhere. You should also confirm laterality and that the right knee is specifically documented. If the source condition is unclear, check documentation before coding.
Do not use for
Do not use this code for degenerative arthritis, trauma, or nonspecific knee pain. It is also incorrect when the infection is not documented as directly related to an infectious or parasitic disease.
Coding tip
Verify the underlying infection or parasitic disease first, then assign M01.X61 only when the right knee involvement is explicitly documented.