VA Disability for Tarsal Tunnel Syndrome: Rating & Evidence (2026)

What Tarsal Tunnel Syndrome Is

Tarsal tunnel syndrome is an entrapment neuropathy of the posterior tibial nerve as it passes through the tarsal tunnel, a fibro-osseous canal behind the medial malleolus. The posterior tibial nerve branches inside or just distal to the tunnel into the medial plantar nerve, the lateral plantar nerve, and the medial calcaneal nerve. Compression at the tunnel produces pain, burning, tingling, and numbness along the medial aspect of the foot and the plantar surface, often radiating into the toes.

Veterans frequently develop tarsal tunnel syndrome after repetitive heavy load-bearing duty, lower-extremity injury, prolonged standing, or as a complication of an existing service-connected condition such as diabetes, pes planus, or post-traumatic ankle deformity. The diagnosis is clinical and electrodiagnostic, supported by imaging when a space-occupying cause is suspected.

Diagnostic Codes Used to Rate It

The VA does not assign a single diagnostic code specifically for tarsal tunnel syndrome. Instead, the condition is rated by analogy under 38 CFR 4.124a using the nerve codes that match the distribution of symptoms and the nerve actually compromised. The three codes that most often apply are listed below.

DC 8525 — Paralysis of the Posterior Tibial Nerve

The posterior tibial nerve is the parent nerve passing through the tarsal tunnel. When the full nerve is involved and symptoms span the medial and lateral plantar distributions, DC 8525 controls. Ratings under DC 8525:

• 30% — Complete paralysis. Paralysis of all muscles of the sole of the foot, frequently with painful paralysis of a causalgic nature, with toes cannot be flexed, with adduction is weakened, and with plantar flexion is impaired.
• 20% — Severe incomplete paralysis.
• 10% — Moderate incomplete paralysis.
• 10% — Mild incomplete paralysis.

DC 8526 and DC 8527 — Plantar Nerves

When symptoms are more distal and limited to either the medial plantar nerve (the medial plantar division of the posterior tibial nerve) or the lateral plantar nerve, separate codes apply.

• DC 8526 (Medial plantar): complete paralysis is rated 30%; severe 20%; moderate 10%; mild 10%.
• DC 8527 (Lateral plantar): complete paralysis is rated 20%; severe 10%; moderate 0%; mild 0%.

Neuralgia and Neuritis Variants (8625, 8626, 8627 and 8725, 8726, 8727)

The same anatomical nerves can be rated under the neuritis (8625/8626/8627) or neuralgia (8725/8726/8727) variants when the predominant symptom is sensory pain rather than motor loss. The rating tiers under these variants follow the same proportional structure as the paralysis codes, but the maximum tier is generally lower because the impairment is sensory rather than motor.

The Rating Tiers Explained

The rating tiers under the nerve codes use four descriptors: mild, moderate, severe, and complete. These descriptors are not defined numerically in 38 CFR — they are interpreted by the rater based on the clinical evidence in the record.

• Mild incomplete paralysis — Sensory symptoms (numbness, tingling, burning) without significant motor weakness, with intermittent functional impairment.
• Moderate incomplete paralysis — Sustained sensory symptoms with some motor weakness, measurable functional limitation in weight-bearing or prolonged standing.
• Severe incomplete paralysis — Significant motor weakness affecting toe flexion, plantar muscles, or adduction, with substantial functional impairment.
• Complete paralysis — Total loss of motor function of the affected nerve distribution, often with causalgic pain.

Because the descriptors are interpretive, the medical record needs to do the work. Vague entries like "foot pain" without distribution detail, motor testing, or functional impact tend to default the rating to the mild tier even when the actual impairment is greater.

Bilateral Factor and the Combined Rating

Tarsal tunnel syndrome is frequently bilateral, particularly when the underlying cause is systemic (diabetes, pes planus) or biomechanical. When both feet are rated, the bilateral factor under 38 CFR 4.26 applies. The bilateral factor adds 10% of the combined value of the two foot ratings to the combined rating, before further combination with other disabilities.

This matters because two 10% ratings for bilateral tarsal tunnel syndrome alone would combine to 19% under VA combined ratings math (rounded to 20%) before the bilateral factor. With the bilateral factor, the combined value moves higher, and the impact compounds when combined with other lower-extremity disabilities.

Service-Connection Pathways

Direct Service Connection

A direct claim is supported when service treatment records document an in-service event or condition that initiated the tarsal tunnel pathology. Common direct pathways include:

• Ankle sprain or fracture with healed deformity producing post-traumatic tarsal tunnel compression.
• Repetitive parachute landings, road marches, or load-bearing duty causing chronic microtrauma to the medial ankle.
• Direct nerve injury from blast, blunt trauma, or surgical complication during service.
• In-service diagnosis of tarsal tunnel syndrome with persistence after separation.

Secondary Service Connection

Under 38 CFR 3.310, tarsal tunnel syndrome may be granted secondary service connection when caused or aggravated by a service-connected condition. The most common secondary pathways are:

• Service-connected diabetes with diabetic neuropathy producing or aggravating tarsal tunnel compression.
• Service-connected pes planus or other foot deformity altering medial ankle biomechanics and increasing pressure inside the tunnel.
• Service-connected ankle disability (fracture, instability, surgical hardware) producing post-traumatic anatomical change at the tunnel.
• Service-connected lumbar radiculopathy with distal nerve compromise that contributes to or worsens the entrapment.
• Service-connected obesity-as-intermediary cases where obesity is the bridge between a primary service-connected condition and the development of tarsal tunnel syndrome.

Evidence That Supports the Record

• Clinical diagnosis notes documenting Tinel sign at the medial malleolus, positive pressure test, and reproduction of symptoms.
• Electrodiagnostic studies — EMG and nerve conduction studies showing slowing or amplitude reduction across the tarsal tunnel.
• MRI of the foot and ankle when a space-occupying cause is suspected (ganglion, varicosity, accessory muscle, tumor).
• Motor strength testing of intrinsic foot muscles innervated by the posterior tibial nerve.
• Sensory testing mapping the distribution along the medial and lateral plantar nerves.
• Treatment records documenting orthotics, corticosteroid injections, physical therapy, and surgical release.
• Functional capacity evaluation documenting standing and walking tolerance, gait abnormality, and inability to use certain footwear.
• Symptom log documenting frequency, intensity, and triggers of pain and paresthesias.

Post-Surgical Residuals

When surgical release of the tarsal tunnel has been performed, the VA evaluates the residual nerve function under the same diagnostic codes (DC 8525, 8526, or 8527). The surgery itself is treatment, not a separately rated condition. Two notes apply.

First, surgical release sometimes produces partial improvement but leaves residual sensory deficit, motor weakness, or neuropathic pain. The rating reflects the residuals, not the pre-surgical severity.

Second, surgical scarring may be separately ratable under 38 CFR 4.118 if the scar is painful (DC 7804), unstable (DC 7805), or limits function (DC 7805). A 10% rating is available for one or two painful or unstable scars, with higher tiers for more numerous or extensive scars.

Common Mistakes to Avoid

• Treating tarsal tunnel as plantar fasciitis or generic foot pain. The two are different conditions with different rating codes. Plantar fasciitis rates under DC 5276 or 5284. Tarsal tunnel rates under the nerve codes.
• Missing electrodiagnostic confirmation. Without EMG and nerve conduction studies, raters often default to a mild rating even when the clinical picture supports more.
• Not claiming bilateral when both feet are affected. The bilateral factor adds meaningful percentage to the combined rating.
• Failing to claim secondary pathways. Service-connected diabetes, pes planus, or ankle injury are commonly overlooked as secondary triggers.
• Ignoring scar residuals after release surgery. Painful or unstable surgical scars are separately compensable.
• Sparse C&P exam findings. A C&P exam that records only "foot pain" without distribution, motor testing, or functional impact tends to default to the lowest tier.