 The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 -- which created the benchmark/framework/competitive-bidding process -- also renamed +Choice plans to "Medicare Advantage" plans.Other managed Medicare plans include COST plans, dual-eligible (Medicare/Medicaid) plans and PACE plans (which try to keep seniors that need non-medical custodial care in their homes).However 97% of the beneficiaries in Part C are in one of the roughly one dozen types of Medicare Advantage plans (HMO, employer group, SNP, regional PPO, etc.