ADHD (Aggravated by Service) is rated by the U.S. Department of Veterans Affairs under DC 9440 of 38 CFR § 4.130, DC 9440 across 6 severity tiers (0% / 10% / 30% / 50% / 70%…). Service connection requires (1) a current diagnosis, (2) an in-service event, injury, or exposure, and (3) a medical nexus opinion linking the two under 38 C.F.R. § 3.303.
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental condition marked by a persistent pattern of inattention, distractibility, disorganization, and/or hyperactivity-impulsivity that interferes with functioning. Under DSM-5 it is by definition childhood-onset, requiring several symptoms to be present before age 12, so in a veteran it nearly always pre-exists service; a service-aggravated claim therefore turns on whether military duty caused a permanent worsening of the baseline condition rather than on de novo onset. The VA rates the residual disability under the General Rating Formula for Mental Disorders based on the degree of occupational and social impairment, not on the symptom count itself.
Rating criteria text quoted verbatim from 38 C.F.R. § 4.130 (Mental disorders). Source verified 2026-05-15 by ClaimRecon Editorial Team against the Cornell Law CFR mirror; eCFR.gov is the authoritative government source.