Yes, you likely need a Medicare Supplement plan, also known as Medigap coverage, or a Medicare Advantage Plan. Going with just Original Medicare and no supplemental coverage is generally not wise due to substantial gaps in Medicare, leaving you responsible for expensive deductibles and 20% of all outpatient coverage. Medicare Supplement plans are designed to fill these gaps, providing peace of mind and protecting you from potentially catastrophic medical bills. These plans cover co-payments, deductibles, and coinsurance that you would otherwise be responsible for, and some even offer coverage for foreign travel emergencies. There are 10 standardized Medicare Supplement plans (A, B, C, D, F, G, K, L, M, and N) and one high-deductible plan, with options available for various budgets.