Once you have Part A and Part B, you choose one of two paths. They are not two versions of the same thing. They are different structures with different trade-offs, and switching later is not always possible.
Path one: Original Medicare plus a Supplement
- See any doctor or hospital in the country that accepts Medicare. No networks, no referrals.
- A Supplement (Medigap) pays most of what Medicare does not. With Plan G, your medical cost for the year is essentially the Part B deductible.
- You add a separate Part D plan for prescriptions.
- Cost: the Part B premium, the Supplement premium, and the Part D premium every month, whether or not you use care.
Path two: Medicare Advantage
- A private plan that replaces Original Medicare's claims handling. Hospital, medical, and usually drug coverage in one card.
- Networks. HMOs need referrals and in-network care. PPOs let you go out of network at a higher cost.
- Extras Original Medicare never had: dental, vision, hearing, gym memberships, over-the-counter allowances.
- Cost: often $0 premium beyond Part B, but copays and coinsurance as you use care, up to an annual out-of-pocket maximum.
Who leans which way
- Supplement: people who travel, split time between states, have specialists they will not give up, or want predictable costs and no network questions.
- Advantage: people who want a low monthly cost, are comfortable with a network, and value the extras.
- Chronic conditions with frequent care: run the numbers both ways. Advantage copays add up; Supplement premiums are steady.
The one-way door
You can always move from a Supplement to Advantage during the Annual Enrollment Period. Moving back is harder. Outside your Medigap open enrollment window, most states let Supplement carriers decline you for health reasons. If you start with Advantage and develop a serious condition, a Supplement may no longer be available to you. This is the part of the decision that deserves the most thought.
This guide is general information, not advice about a specific policy. Benefits, enrollment rules, and costs vary by state, carrier, and year. Confirm details for your situation with a licensed agent.
