Ratings and Evaluations; Service Connection | MidpageRatings and Evaluations; Service Connection
3.303Principles relating to service connection.3.304Direct service connection; wartime and peacetime.3.305Direct service connection; peacetime service before January 1, 1947.3.306Aggravation of preservice disability.3.307Presumptive service connection for chronic, tropical, or prisoner-of-war related disease, disease associated with exposure to certain herbicide agents, or disease associated with exposure to contaminants in the water supply at Camp Lejeune; wartime and service on or after January 1, 1947.3.308Presumptive service connection; peacetime service before January 1, 1947.3.309Disease subject to presumptive service connection.3.310Disabilities that are proximately due to, or aggravated by, service-connected disease or injury.3.311Claims based on exposure to ionizing radiation.3.312Cause of death.3.313Claims based on service in Vietnam.3.314Basic pension determinations.3.315Basic eligibility determinations; dependents, loans, education.3.316Claims based on chronic effects of exposure to mustard gas and Lewisite.3.317Compensation for certain disabilities occurring in Persian Gulf veterans.3.318Presumptive service connection for amyotrophic lateral sclerosis.3.319[Reserved]3.320Claims based on exposure to fine particulate matter.3.320aPresumptive service connection for bladder, ureter, and related genitourinary cancers.3.320bPresumptive service connection for leukemias, multiple myelomas, myelodysplastic syndromes, and myelofibrosis.3.321General rating considerations.3.322Rating of disabilities aggravated by service.3.323Combined ratings.3.324Multiple noncompensable service-connected disabilities.3.325[Reserved]3.326Examinations.3.327Reexaminations.3.328lndependent medical opinions.3.329[Reserved]3.330Resumption of rating when veteran subsequently reports for Department of Veterans Affairs examination.3.331-3.339[Reserved]3.340Total and permanent total ratings and unemployability.3.341Total disability ratings for compensation purposes.3.342Permanent and total disability ratings for pension purposes.3.343Continuance of total disability ratings.3.344Stabilization of disability evaluations.