38 CFR 4.127 : Pensions, Bonuses, And Veterans' Relief (§ 0.600 To Parts 201-299) — (§ 0.600 To § 17.3130) — Department Of Veterans Affairs (§ 0.600 To § 17.3130) — Schedule For Rating Disabilities (§ 4.1 To Appendix C To Part 4) — Disability Ratings (§ 4.40 To Appendix C To Part 4) — Mental Disorders (§ 4.125 To § 4.130) — 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.