The UMP Preferred Drug List (UMP PDL) is based on the recommendations of the Washington State Pharmacy & Therapeutics Committee (P&T Committee), an independent group of practicing health care providers. For more information on the Washington State P&T Committee and how it works, see the Prescription Drug Program's Web site at www.rx.wa.gov.

UMP uses recommendations from MedImpact's P&T Committee to decide the tier status of drugs not yet reviewed by the Washington State P&T Committee.