Resources Humana Phone Number: 800-457-4708 Website: humana.com RMHP Phone Number: 970-243-7050 Website: rmhp.org AARP United HealthCare Phone Number: 877-699-5710 Website: myaarpmedicare.com Aetna Medicare HMO Phone Number: 833-570-6670 Aetna Medicare PPO Phone Number: 833-282-5366 Anthem Medicare Phone Number: 800-331-1476 Cigna Medicare Phone Number: 800-668-3813