Medigap vs Medicare Advantage: A Decision Framework You Can Actually Use
Every 65-year-old makes one fork-in-the-road choice that shapes their healthcare for decades: Original Medicare wrapped in a Medigap supplement, or a private Medicare Advantage plan. The sales industrial complex pushes Advantage hard because commissions favor it — this article gives you the decision framework the brochures skip.
The shapes of the risk
Medigap converts healthcare into a fixed monthly cost with essentially zero variable exposure: a $120–160 premium plus the $257 deductible, no matter what the year brings. Advantage inverts it: often a $0 premium with real cost-sharing underneath, capped by the plan’s MOOP (up to $9,350 in-network federally, frequently less). Neither is cheaper in the abstract — one is a predictable annuity, the other is a wager on your own health with a defined ceiling.
| Factor | Medigap wins when… | Advantage wins when… |
|---|---|---|
| Budget | You can absorb $150/month | Fixed income makes $150/month painful |
| Health | Chronic conditions, specialists | Healthy, low utilization |
| Providers | You want any Medicare provider | Your system is fully in-network |
| Travel | Nationwide coverage is native | You stay local |
| Stability | Benefits frozen by law | You tolerate annual plan changes |
The exit-door asymmetry
This is the part most buyers learn too late: Medigap-to-Advantage is always allowed; Advantage-to-Medigap after the first year generally requires passing medical underwriting outside guaranteed-issue windows. People try to leave Advantage when they get sick — precisely when underwriting is hardest. If you start on Advantage for the premium, treat the first-year trial right as your clean exit and make the Medigap decision while still healthy.
The honest dollar comparison
Over ten years, a consistently healthy person on a $0-premium MA plan can save $15,000–25,000 versus Medigap premiums. A person with chronic specialty care on the same MA plan can lose that entire advantage to copays, formulary churn and authorization friction — the crossover is entirely claim-history-dependent. Anyone quoting a universal answer is selling something.
A concrete decision procedure
One: list your current providers and verify them against the actual MA networks in your county. Two: total your prescriptions against MA formularies and Part D plans. Three: forecast your realistic worst year (surgeries known, chronic management) against both MOOP and Medigap’s near-zero exposure. Four: check your state’s switching rights — a birthday-rule state (California) or annual-GI state (Washington) makes either choice reversible, which lowers the stakes. Five: decide, and calendar the re-examination triggers (a new diagnosis, a move, a plan termination). The framework takes an afternoon and beats a decade of brochure-driven drift.
Deep dives: the side-by-side file, five scenarios where MA wins, MOOP ceilings explained.