Tarsal tunnel syndrome, left lower limb

This code identifies tarsal tunnel syndrome affecting the left lower limb. Tarsal tunnel syndrome is a compression neuropathy of the posterior tibial nerve or its branches as they pass through the tarsal tunnel, typically resulting in pain, numbness, and tingling in the ankle, heel, and sole of the foot.

Assign this code when documentation explicitly states a diagnosis of tarsal tunnel syndrome specifically impacting the patient's left foot or ankle. Supporting documentation should include clinical findings consistent with nerve compression in the tarsal tunnel, such as positive Tinel's sign, sensory deficits, or motor weakness in the distribution of the posterior tibial nerve.

• Ensure the laterality is clearly documented as "left" to support this specific code.
• Differentiate from other foot pain syndromes; tarsal tunnel syndrome involves nerve compression symptoms.
• Do not confuse with other nerve entrapment syndromes of the lower limb, such as common peroneal nerve entrapment.