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8521
§ 4.124a Schedule of ratings—neurological conditions and convulsive disorders.

Common peroneal nerve paralysis

Paralysis of the common peroneal nerve, which may cause foot drop and difficulty lifting the foot.

What the rating means

VA rates paralysis of the common peroneal nerve under diagnostic code 8521. The possible ratings are 40%, 30%, 20%, and 10%, depending on how much function has been lost.

A 40% rating applies when the paralysis is complete. Complete paralysis means you cannot lift the front of your foot (foot drop), the first segments of all toes droop slightly, you cannot bend the foot upward, you have lost the ability to extend the toe joints closest to the foot, you cannot move the foot outward, movement of the foot inward is weakened, and the entire top surface of your foot and toes has lost feeling.

When the paralysis is incomplete — meaning function is lost or impaired but to a lesser degree than the complete picture — the rating is 30% for severe, 20% for moderate, or 10% for mild. If your nerve involvement is purely sensory, the regulation states the rating should be at the mild level, or at most the moderate level. These ratings are for one side; if both legs are affected, VA combines the ratings and applies the bilateral factor.

Evidence that helps

Medical records that document the specific physical findings matter most here. For a 40% rating, exam findings would need to show foot drop, inability to dorsiflex the foot, loss of dorsal extension of the proximal toe phalanges, absent abduction of the foot, weakened adduction, and documented anesthesia covering the entire top of the foot and toes. Nerve conduction studies or electromyography (EMG) results that confirm complete loss of function along the common peroneal nerve support this level.

For incomplete ratings — severe, moderate, or mild — exam records showing partial loss of strength, limited range of motion, reduced or absent sensation in part of the foot, and abnormal nerve conduction values help establish the degree of impairment. Your own statements, and statements from people who know you, describing how foot weakness or numbness affects your ability to walk, work, or carry out daily activities can help show the functional impact. If the involvement is sensory only, records and statements should reflect that, since the regulation limits purely sensory involvement to no higher than the moderate level.

Secondary conditions

Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.