ICD-10 Code M01.X0 – Direct infection of unspecified joint in infectious and parasitic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M01.X0 – Direct infection of unspecified joint in infectious and parasitic diseases classified elsewhere
What it is
This code identifies a joint infection caused directly by an infectious or parasitic disease classified elsewhere, when the affected joint is not otherwise specified. Use it when the documentation links the joint infection to another underlying infectious process.
Clinical signs
Typical findings include joint pain, swelling, warmth, and reduced range of motion. Clinical features vary; refer to documentation for the specific infectious cause and the joint involved.
When to use this code
Use M01.X0 when the provider documents direct infection of an unspecified joint due to an infectious or parasitic disease elsewhere in the record. Code the underlying infection first when instructed by the record and coding guidance. If the joint or causative organism is named, verify whether a more specific code applies.
Do not use for
Do not use this code for septic arthritis without documentation of a direct infection from another infectious or parasitic disease. Do not use it when a specific joint is identified and a more precise code is supported by the documentation.
Coding tip
Check that the note clearly connects the joint infection to an underlying infectious or parasitic disease before assigning M01.X0.