In an effort to simplify Medicare’s cost-sharing requirements, provide beneficiaries with catastrophic protection, and achieve program savings, some have proposed to restructure Medicare’s benefit design. Several recent proposals would create a unified deductible for Medicare Parts A and B, simplify cost-sharing requirements above the deductible, and add an annual limit on beneficiary out-of-pocket spending—a benefit feature typical of larger employer plans, but lacking in traditional Medicare. This issue brief describes the options for adding an out-of-pocket spending limit to Medicare and examines the operational issues that could arise in implementing both a uniform and an income-based out-of-pocket spending limit. Because the implementation of an income-related out-of-pocket maximum would pose somewhat greater complexity for Medicare, the operational issues associated with this approach are discussed in greater detail.