The A - Z Guide: Veterans VA Disability Benefits
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§ 3.327 Reexaminations.
(a) General. Reexaminations, including periods of hospital observation, will be requested whenever VA determines there is a need to verify either the continued existence or the current severity of a disability.
As a rule, if the veteran holds a 100% schedular rating, to successfully reduce the rating VA must show improvement in the condition. If the veteran holds a 100% IU rating VA must show improvement in the condition and the ability of the veteran to hold substantially gainful employment.
Also see §3.326 Examinations.