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8913
§ 4.124a Schedule of ratings—neurological conditions and convulsive disorders.

Diencephalic seizures

Seizures originating in the diencephalon region of the brain, which may cause autonomic or emotional symptoms.

What the rating means

Diencephalic seizures are rated under diagnostic code 8913 as Epilepsy, diencephalic. VA rates this condition using the General Rating Formula for Major and Minor Epileptic Seizures. By default, diencephalic seizures are rated as minor seizures. If you have both major and minor seizures, VA rates the predominating type — whichever occurs more often.

The possible ratings are 10, 20, 40, 60, 80, and 100 percent. A confirmed diagnosis with a history of seizures earns 10 percent. From there, the rating rises with how often seizures occur over the past year or two. At the top, averaging at least one major seizure per month over the last year results in 100 percent. For minor seizures, more than 10 per week over the last year results in 80 percent, while at least two minor seizures in the last six months results in 20 percent. There is no distinction between daytime and nighttime major seizures. If you take continuous medication to control the epilepsy, the minimum rating is 10 percent, and that rating cannot be combined with any other epilepsy rating.

Evidence that helps

Because the rating turns on how frequently seizures occur, medical records documenting each seizure event are central. Treatment notes, neurology records, and emergency or urgent care visits that record the date, type, and description of each seizure help establish frequency over the relevant time period — the last six months, last year, or last two years, depending on the rating level being considered.

A confirmed diagnosis of epilepsy is required for even the lowest 10 percent rating, so diagnostic records establishing that confirmed diagnosis matter at every level. If you take medication to control the seizures, pharmacy records and prescribing notes showing that continuous medication is necessary support the 10 percent minimum floor.

Statements from you, family members, or caregivers describing witnessed seizures — including how often they happen and what they look like — can fill gaps when a seizure occurs outside a medical setting. For higher rating levels, where frequency must be shown across a full year or longer, a consistent record of documented events over that entire period carries the most weight.

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.