ICD-10 Code G57.50 – Tarsal Tunnel Syndrome, Unspecified Lower Limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.50 – Tarsal tunnel syndrome, unspecified lower limb
What it is
G57.50 identifies tarsal tunnel syndrome affecting an unspecified lower limb. It describes compression or entrapment of the posterior tibial nerve or its branches near the ankle.
Clinical signs
Typical findings include pain, burning, tingling, or numbness along the sole of the foot or toes. Clinical features vary; refer to documentation for laterality and nerve involvement.
When to use this code
Use this code when the provider documents tarsal tunnel syndrome but does not specify right or left lower limb. It also fits cases where the record confirms nerve entrapment at the tarsal tunnel without more detail.
Check documentation if symptoms are described without a confirmed diagnosis. Do not assign it solely for generalized foot pain or ankle pain.
Do not use for
Do not use G57.50 for a specified right or left tarsal tunnel syndrome. Do not use it when the chart supports another cause of neuropathy or pain.
Coding tip
Verify laterality in the note first; if it is missing, this unspecified code is appropriate only when the diagnosis itself is documented.