ICD-10 Code M01.X39 – Direct infection of unspecified wrist in infectious and parasitic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M01.X39 – Direct infection of unspecified wrist in infectious and parasitic diseases classified elsewhere
What it is
This code identifies a direct infectious arthritis or joint involvement of the unspecified wrist due to another infectious or parasitic disease. Use it when the wrist infection is documented as secondary to an underlying condition classified elsewhere.
Clinical signs
Typical findings include wrist pain, swelling, warmth, and reduced range of motion. Clinical features vary; refer to documentation for the specific infectious cause and whether the wrist is the affected joint.
When to use this code
Use M01.X39 when the record states direct infection of the wrist and links it to an infectious or parasitic disease elsewhere in the chart. Apply it when the wrist is unspecified and the documentation does not name left or right. Code the underlying infection separately when required.
Do not use for
Do not use this code for nonspecific wrist pain, trauma, or degenerative arthritis. If the chart does not support a direct infectious process or the causative disease is not documented, check documentation.
Coding tip
Verify that the wrist infection is secondary to another infectious disease and that laterality is not documented before assigning this code.