Original Medicare and Part D have no out-of-pocket maximums, exposing beneficiaries to limitless financial risk. While Medicare Advantage (MA) plans do include an out-of-pocket maximum in their benefit packages, this threshold is too high—permitting costs up to $6,700 in 2019. Congress should establish a standardized, affordable, out-of-pocket maximum for Original Medicare, MA, and Part D. To both lower costs for beneficiaries and the system, this change must be coupled with efforts address the underlying problem of high drug prices.