Medicare Cost Contract Extension and Refinement Act of 2005

Medicare Cost Contract Extension and Refinement Act of 2005 - Amends title XVIII (Medicare) of the Social Security Act (SSA) to: (1) extend the period reasonable cost reimbursement contracts under Medicare can remain in the market, and the period during which they can be modified to expand their service area; and (2) apply to extended or renewed reasonable cost contracts certain requirements under Medicare part C (Medicare Advantage).