ICD-10 Code M01.X7 – Direct infection of ankle and foot in infectious and parasitic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M01.X7 – Direct infection of ankle and foot in infectious and parasitic diseases classified elsewhere
What it is
M01.X7 identifies a direct infection involving the ankle or foot when the underlying infectious or parasitic disease is classified elsewhere. Use this code when the joint infection is linked to another documented infection.
Clinical signs
Typical findings include localized pain, swelling, warmth, and reduced range of motion in the ankle or foot. Clinical features vary; refer to documentation for the causative infection and confirmed joint involvement.
When to use this code
Use M01.X7 when the record states direct infection of the ankle or foot and the provider links it to an infectious or parasitic condition coded elsewhere. It is appropriate when the documentation clearly identifies the affected joint and the external infectious cause. Check documentation if the site or causal disease is unclear.
Do not use for
Do not use this code for nonspecific foot pain, cellulitis, or bone infection without documented joint involvement. Do not assign it if the infection is not described as secondary to another infectious or parasitic disease.
Coding tip
Verify both the joint site and the underlying infection before coding, because M01.X7 requires the causative condition to be coded separately.