ICD-10 Code M01.X4 – Direct infection of hand in infectious and parasitic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M01.X4 – Direct infection of hand in infectious and parasitic diseases classified elsewhere
What it is
This code identifies a direct infection involving the hand that is classified to another underlying infectious or parasitic disease. Use it when the hand infection is part of a broader disease process, not a primary hand condition.
Clinical signs
Findings may include localized hand pain, swelling, warmth, redness, and reduced function. Clinical features vary; refer to documentation for the specific infectious or parasitic cause and the affected hand structures.
When to use this code
Use M01.X4 when documentation states the hand is directly infected as a manifestation of an infectious or parasitic disease classified elsewhere. The record should link the hand involvement to the underlying condition. If the provider does not specify direct infection or the causal disease, check documentation.
Do not use for
Do not use this code for routine cellulitis, abscess, or trauma-related hand infection unless the provider documents a direct infection from another classified disease. Do not assign it when the underlying infectious diagnosis is not documented.
Coding tip
Code the underlying infectious or parasitic disease first, and use M01.X4 only when the chart clearly supports direct hand involvement.