This bill amends title 38, United States Code, to improve the Department of Veterans Affairs' schedule for rating disabilities. It mandates that the VA's disability rating schedule must be constructed to discount the beneficial effects of medication or treatment when evidence can establish a baseline without those effects. This ensures that a veteran's disability rating reflects the underlying severity of their condition before treatment-induced improvements. The legislation clarifies that this requirement does not prevent veterans from seeking compensation for additional disabilities resulting from medication or treatment for service-connected injuries or diseases. It also ensures that veterans can still claim compensation for the aggravation of pre-existing conditions due to service, even if those aggravations are related to treatment.