Tarsal tunnel syndrome

This code identifies a compression neuropathy affecting the posterior tibial nerve or its branches as it passes through the tarsal tunnel in the ankle. Patients typically experience pain, numbness, and tingling in the sole of the foot, toes, or heel, often exacerbated by activity.

Apply this code when documentation clearly indicates a diagnosis of tarsal tunnel syndrome, supported by clinical findings such as positive Tinel's sign at the ankle, sensory deficits, or motor weakness in the foot. It is appropriate for both initial diagnosis and subsequent encounters for management of the condition.

• Differentiate from other foot neuropathies like plantar fasciitis or Morton's neuroma, which have distinct anatomical locations and nerve involvement.
• Ensure documentation specifies the laterality (left, right, or bilateral) if known, though this ICD-9 code does not allow for laterality specificity.
• Look for supporting diagnostic studies such as nerve conduction studies or electromyography, though clinical diagnosis is often sufficient.