When you become eligible for Medicare, one of the most consequential decisions you'll face is how to supplement your coverage. Original Medicare (Parts A and B) covers a broad range of services but leaves significant gaps — particularly the 20% coinsurance with no annual cap. Two primary options exist to address these gaps: Medicare Supplement Insurance (Medigap) and Medicare Advantage (Part C).
These are fundamentally different approaches to Medicare coverage, and the right choice depends on your health, lifestyle, financial situation, and personal preferences. This guide breaks down both options so you can make an informed decision.
What Is Medicare Supplement Insurance (Medigap)?
Medigap is a private insurance policy that works alongside Original Medicare. You keep your Medicare Parts A and B, and your Medigap plan pays some or all of the cost-sharing that Original Medicare doesn't cover — deductibles, copays, and coinsurance.
Medigap plans are standardized by the federal government and labeled by letter (Plan A, Plan B, Plan G, Plan N, etc.). Each lettered plan offers the same standardized benefits regardless of which insurance company sells it — the only difference between carriers is the premium they charge.
Key Features of Medigap
- Works with any Medicare-accepting provider nationwide — no network restrictions
- Predictable costs — Plan G, for example, covers nearly all cost-sharing after the Part B deductible
- No referrals needed to see specialists
- Does not include drug coverage — you must enroll in a separate Part D plan
- Does not include dental, vision, or hearing — you would need separate coverage for these
- Monthly premiums can be significant — often $150–$350+ per month depending on your age, location, and plan type
What Is Medicare Advantage (Part C)?
Medicare Advantage is a private insurance plan that replaces Original Medicare. Instead of receiving your benefits through the federal government, you receive them through a private insurer approved by Medicare. The plan must cover everything Original Medicare covers, but it can also offer additional benefits.
Key Features of Medicare Advantage
- Often includes drug coverage (Part D) in one bundled plan
- Frequently includes dental, vision, hearing, and OTC benefits
- Many plans have $0 monthly premiums (beyond the Part B premium you already pay)
- Has an annual out-of-pocket maximum (MOOP) — once reached, the plan covers 100% of covered costs
- Uses provider networks — HMO plans require in-network care (except emergencies); PPO plans offer more flexibility
- May require referrals for specialist visits (HMO plans)
- Benefits and costs vary significantly by plan and location
Side-by-Side Comparison
Here's a high-level comparison to help you visualize the key differences:
| Feature | Medigap | Medicare Advantage |
|---|---|---|
| Monthly premium | Higher ($150–$350+) | Often $0 (beyond Part B) |
| Provider network | Any Medicare provider nationwide | In-network required (HMO) or preferred (PPO) |
| Drug coverage | Separate Part D plan required | Usually included |
| Dental/Vision/Hearing | Not included | Often included |
| Out-of-pocket maximum | Very low (Plan G covers most costs) | Set by plan (up to $9,350 in 2026) |
| Referrals needed | No | Sometimes (HMO plans) |
| Travel coverage | Nationwide + some foreign emergency | Primarily in-network service area |
| Predictability of costs | Very high | Moderate (depends on usage) |
Who Tends to Choose Medigap?
Medigap tends to be a better fit for people who:
- Travel frequently or split time between states and want nationwide provider access
- Have complex health conditions and see multiple specialists regularly
- Value predictable, low out-of-pocket costs above all else
- Are willing to pay higher monthly premiums for comprehensive coverage
- Have a preferred doctor or hospital that may not be in a Medicare Advantage network
Who Tends to Choose Medicare Advantage?
Medicare Advantage tends to be a better fit for people who:
- Want to minimize monthly premium costs
- Value extra benefits like dental, vision, hearing, and OTC allowances
- Are generally healthy and don't anticipate high healthcare utilization
- Have doctors and hospitals that are in-network with available plans
- Want the convenience of an all-in-one plan (medical + drugs + extras)
An Important Timing Note: Medigap Enrollment
If you're considering Medigap, timing matters. Your Medigap Open Enrollment Period begins the month you turn 65 and are enrolled in Part B. During this 6-month window, insurers cannot deny you coverage or charge you more due to pre-existing conditions. After this window closes, you may face medical underwriting — meaning you could be denied or charged higher premiums based on your health history.
Medicare Advantage plans, by contrast, cannot deny you coverage based on health status during open enrollment periods.
Get Personalized Guidance from VC Health
There is no universally "right" answer between Medigap and Medicare Advantage — it depends entirely on your individual circumstances. At VC Health, our licensed agents take the time to understand your health needs, budget, and priorities before recommending any plan. We represent multiple carriers and plan types, so you can trust that our recommendations are based on what's best for you.
Call us at 1 (888) 592-2613 | TTY 711, Monday through Friday, 9 a.m. to 6 p.m. EST. There is no charge for our guidance.
VC Health is a licensed insurance agency. Plan availability, benefits, and costs vary by location and are subject to change. This article is for informational purposes only and does not constitute insurance advice. Contact a licensed agent for personalized guidance. Not connected with or endorsed by the U.S. Government or the federal Medicare program.
