AARP Medicare Supplement Customer Service Numbers Home» AARP» AARP Medicare Supplement General: 1-866-524-7865Alternative: 1-800-444-6544 PO Box 1017, Montgomeryville, Pennsylvania 18936 United StatesDirections: Follow the directions to locate AARP Medicare SupplementSend Message:member@aarp.org.Locations Near You: Find nearby locations of AARP Medicare SupplementAarp Medicare Supplement PlanFor any kind of help call atTelephone: 1-866-408-5545Basic OverviewAARP, which was founded in 1958 by Ethel Percy Andrus and Leonard Davis, is an interest group in the United States which believes in the empowerment and better living for people after they have crossed a certain age. As of 2018, the number of members it had were about 38 million in number. Social change is one of the many initiatives taken up by this organization. The headquarters of the organization are located Washington, D.C., United States. The employees of the organization are 1,986 in number and the volunteers that serve are more than 17,000.AARP is totally called as (American civilized of Retired Persons)that embarked was arose on dated 1958. AARP Medicare Supplement Insurance programs are merely medicare programs supported by AARP Incorporation, a non profit corporation. AARP Medicare additives are merely Medicare tactics hold by AARP Incorporation, a not for profit corporation. These programs are bestowed by the means of UHIC (United health management Insurance Company).