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8412
§ 4.124a Schedule of ratings—neurological conditions and convulsive disorders.

Hypoglossal nerve pain (twelfth cranial nerve)

Pain along the hypoglossal nerve that may affect the tongue and throat.

What the rating means

Hypoglossal nerve neuralgia (diagnostic code 8412) is rated under the same formula used for hypoglossal nerve paralysis (diagnostic code 8212), which covers loss of motor function of the tongue. The possible ratings are 10%, 30%, and 50%. A 10% rating applies when the paralysis is incomplete and moderate. A 30% rating applies when the paralysis is incomplete but severe. A 50% rating applies when the paralysis is complete. Because neuralgia involves sensory symptoms rather than full motor loss, the regulation specifies that when involvement is wholly sensory, the rating should be for the mild or, at most, the moderate degree. These ratings are for one side; if both sides of the nerve are affected, the two evaluations are combined with application of the bilateral factor.

Evidence that helps

Because the rating turns on the degree of lost or impaired motor function of the tongue, medical records that document how much tongue movement you have lost are central. Examination findings that describe tongue strength, coordination, deviation, and range of motion help show whether impairment is moderate or severe. If your involvement is wholly sensory, records showing the nature and extent of sensory symptoms support placement at the mild or moderate level. Speech evaluations or swallowing studies can reflect functional loss tied to tongue motor function. Statements from you or people who know you describing difficulty speaking, eating, or swallowing in daily life can help show how the condition affects function. Records from neurology or otolaryngology visits that track changes over time are also useful for showing the current level of impairment.

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.