Health care debt is a widespread problem in the United States. Medicare offers coverage for a range of health care services, including hospitalizations, physician visits, prescription drugs, and post-acute care, but Medicare beneficiaries generally pay out-of-pocket for their monthly premiums and deductibles, cost-sharing for Medicare-covered services, and the cost of services not covered by Medicare. This data note examines findings from the KFF Health Care Debt Survey to assess the prevalence, sources and consequences of health care debt among Medicare-age adults.