---
title: "§ 4.127 Intellectual disability (intellectual developmental disorder) and personality disorders."
document: "38 CFR"
section: "§ 4.127"
canonical: "https://veteranai.co/va-regulations/38-cfr/4.127-intellectual-disability-intellectual-developmental-disorder"
source: "https://www.ecfr.gov/current/title-38/section-4.127"
updated: "2026-09-07T14:36:31.960416Z"
---

# § 4.127. 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.

[79 FR 45100, Aug. 4, 2014]