MERGE is a new Group Purchasing Program powered by two of McKesson’s top GPOs, MediGroup and PSMA.- MERGE is an exclusive McKesson program that gives McKesson customers access to the nations’ largest GPO for physician offices, surgery centers, and specialty clinics. MERGE provides an impressive array of contracts ranging from medical supplies to pharmaceuticals, laboratory supplies, medical waste and everything else required to equip health care facilities. With over 1100 vendors on contract, MERGE members access the most cost saving and revenue enhancement solutions available in the health care industry.