Original Medicare vs Medicare Advantage: Key Differences

When Helen turned 65, she was overwhelmed by Medicare options. Her neighbor loved Medicare Advantage. Her doctor recommended Original Medicare. Here's what you need to know to decide. Original Medicare (Parts A and B) is run by the federal government. You can see any doctor or hospital in the US that accepts Medicare — no network restrictions. You pay 20% of most services after your deductible, with no annual out-of-pocket maximum (which is why most people add a Medigap supplement). You need a separate Part D plan for prescriptions. Medicare Advantage (Part C) is run by private insurance companies approved by Medicare. Plans often include Part D drug coverage, dental, vision, hearing, and fitness benefits. Monthly premiums are often lower (some are $0). The tradeoff: you must use in-network providers (or pay much more), plans require referrals and prior authorization for many services, and coverage varies significantly by plan. Key differences that matter most: Provider choice — Original Medicare wins. If you travel, see specialists, or want to choose any Medicare-accepting doctor, Original Medicare gives you that freedom. Cost predictability — Advantage often wins for people who want one plan with a known maximum out-of-pocket limit. Prior authorization — Advantage plans deny services at higher rates due to prior auth requirements (OIG found 13% of MA prior auth denials were inappropriate). Switching — you can switch from Advantage back to Original Medicare during open enrollment, but buying Medigap after your initial enrollment period may require medical underwriting. There's no single right answer. Consider your health, budget, and how much provider flexibility you need.