38 C.F.R. § 4.127 : Pensions, Bonuses, and Veterans' Relief — DEPARTMENT OF VETERANS AFFAIRS — SCHEDULE FOR RATING DISABILITIES — DISABILITY RATINGS —MENTAL DISORDERS — Intellectual disability (intellectual developmental disorder) and personality disorders

Intellectual disability (intellectual developmental disorder) and personality disorders are not diseases or injuries for compensation purposes, and, except as provided in §3.310(a) of this chapter, disability resulting from them may not be service-connected. However, disability resulting from a mental disorder that is superimposed upon intellectual disability (intellectual developmental disorder) or a personality disorder may be service-connected.