ICD-10 Code M01.X42 – Direct infection of left hand in infectious and parasitic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M01.X42 – Direct infection of left hand in infectious and parasitic diseases classified elsewhere
What it is
This code identifies a direct infectious process affecting the left hand when the underlying infectious or parasitic disease is classified elsewhere. Use it when the hand involvement is documented as due to another specified infection.
Clinical signs
Typical findings include localized pain, swelling, warmth, redness, and limited hand motion. Clinical features vary; refer to documentation for the specific infectious cause and the affected structures.
When to use this code
Use M01.X42 when the record states a direct infection of the left hand and links it to an infectious or parasitic disease classified elsewhere. The provider should document both the hand involvement and the underlying infection. Check documentation if laterality or causation is unclear.
Do not use for
Do not use this code for nonspecific hand pain, cellulitis, or abscess without documentation of a direct infectious process tied to another disease. Do not assign it if the left hand is not specified.
Coding tip
Always code the underlying infectious disease first or as directed, and confirm that the left-hand site is explicitly documented.