ICD-10 Code L94.6 – Ainhum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L94.6 – Ainhum
What it is
Ainhum is a rare condition in which a constricting band forms around a toe, usually the fifth toe, and gradually narrows it. Over time, the toe may become painful, swollen, and separated from the foot.
Clinical signs
Typical findings include a circumferential groove or band at the base of a toe, progressive tapering, and possible swelling or pain. Clinical features vary; refer to documentation.
When to use this code
Use L94.6 when the provider documents ainhum or a true constricting band causing progressive autoamputation of a toe. It is appropriate when the diagnosis is confirmed clinically and the record clearly identifies this condition. Check documentation if the note only describes toe pain, swelling, or a nonspecific skin lesion.
Do not use for
Do not use this code for traumatic toe amputation, infection, or other causes of toe constriction unless ainhum is specifically documented. Do not assume the diagnosis from deformity alone.
Coding tip
Query the provider if the chart mentions a constricted toe without naming ainhum, because the code is specific to that diagnosis.