Tarsal tunnel syndrome, unspecified lower limb

This code signifies a compressive neuropathy of the posterior tibial nerve or its branches as it passes through the tarsal tunnel, resulting in pain, numbness, and tingling in the foot. It is analogous to carpal tunnel syndrome but occurring in the ankle. The "unspecified lower limb" indicates that the laterality (right or left) is not documented.

Apply this code when the medical record clearly diagnoses tarsal tunnel syndrome, but the provider has not specified whether it affects the right or left foot. This is appropriate for initial encounters or when documentation is incomplete regarding laterality.

• Avoid using this code if laterality is documented; instead, choose the more specific G57.51 (right) or G57.52 (left).
• Ensure the documentation explicitly states "tarsal tunnel syndrome" or provides sufficient clinical detail to support this diagnosis.
• Query the provider for laterality if possible to allow for more specific coding.