One of the biggest decisions facing Medicare beneficiaries is whether to sign up for a Medicare Advantage plan or remain on Original Medicare with a Medigap (Medicare Supplement) policy. Each path has clear strengths, and the right option depends on your individual situation.
How Each Approach Works
Medicare Advantage (Part C)
You get all your Medicare benefits through a private insurance company. These plans take the place of Original Medicare and frequently bundle medical, hospital, and drug coverage into a single plan along with extras like dental and vision.
Original Medicare + Medigap
You keep Original Medicare (Parts A and B) as your primary insurance. A Medigap policy, bought separately from a private insurer, helps cover some or all of the out-of-pocket expenses that Original Medicare leaves behind, including deductibles, coinsurance, and copayments. You also need a standalone Part D plan for prescription drug coverage.
How They Differ
| Feature | Medicare Advantage | Original Medicare + Medigap | |---|---|---| | Monthly cost | Often $0 plan premium (plus Part B) | Part B premium + Medigap premium + Part D premium | | Out-of-pocket max | Yes (required by law) | No cap on Original Medicare; Medigap covers most cost-sharing | | Provider network | Usually required (HMO/PPO) | Any Medicare-accepting provider nationwide | | Referrals | Often required (HMO plans) | Never required | | Extra benefits | Dental, vision, hearing, fitness common | Not included (must purchase separately) | | Drug coverage | Usually included | Requires separate Part D plan | | Prior authorization | Sometimes required | Not required |
Comparing Costs
Medicare Advantage plans frequently feature lower upfront premiums, but cost-sharing when you receive care (copays, coinsurance) can accumulate, particularly during a serious illness. Medigap policies carry higher monthly premiums but deliver more predictable expenses because they cover most or all of your Medicare cost-sharing.
Provider Freedom and Access
Original Medicare paired with Medigap offers the widest provider access available. You can visit any doctor or hospital nationwide that accepts Medicare, with no network limitations or referral requirements. Medicare Advantage plans typically confine you to a network, which may be a concern if you travel regularly or see specialists outside your area.
When to Make Your Choice
The optimal time to enroll in a Medigap policy is during your Medigap Open Enrollment Period -- the six-month window that starts the month you turn 65 and are enrolled in Part B. During this window, insurers cannot refuse you coverage or charge more because of pre-existing conditions. Learn more about guaranteed issue rights.
Medicare Advantage enrollment can be adjusted annually during the Annual Enrollment Period (October 15 through December 7).
Reaching Your Decision
Pick Medicare Advantage if you want lower premiums, all-in-one benefits, and are fine with a provider network. Pick Original Medicare + Medigap if you value provider freedom, prefer predictable out-of-pocket costs, and do not mind paying higher premiums for broader coverage.