Understanding Your Two Main Options After Original Medicare

When you enroll in Medicare, you face a critical choice: Medicare Advantage (Part C) or Original Medicare paired with a Medicare Supplement (Medigap) plan. Both cover hospital and medical services, but they work very differently when it comes to costs, provider choice, and out-of-pocket protection.

This comparison breaks down the key differences so you can choose the path that best fits your healthcare needs, budget, and lifestyle in 2026.

Medicare Advantage (Part C): The All-in-One Approach

Medicare Advantage plans are offered by private insurers approved by Medicare. They bundle Part A (hospital) and Part B (medical) into a single plan, and most include Part D (prescription drugs). Many also offer extra benefits like dental, vision, hearing, and fitness programs.

• Lower monthly premiums: Many plans have $0 premiums (you still pay the Part B premium)
• Bundled coverage: Hospital, medical, and often prescriptions in one plan
• Extra benefits: Dental, vision, hearing, and wellness programs commonly included
• Network restrictions: Most plans require you to use in-network doctors (HMO) or charge more for out-of-network care (PPO)
• Annual out-of-pocket maximum: Caps your yearly spending (typically $3,000 to $8,000+)
• Prior authorization: Some services require plan approval before treatment

Medicare Supplement (Medigap): The Predictable Coverage Approach

Medigap plans fill the “gaps” in Original Medicare, covering costs like deductibles, copayments, and coinsurance. You keep Original Medicare as your primary coverage and add a Medigap policy on top.

• Higher monthly premiums: Typically $100 to $300+ per month depending on your location and plan type
• Predictable costs: Covers most or all of your out-of-pocket costs under Original Medicare
• Any doctor, any hospital: See any provider that accepts Medicare, anywhere in the U.S., with no referrals needed
• No network restrictions: Freedom to choose specialists and hospitals without network limitations
• Standardized plans: Plan G, Plan N, and other letter plans offer the same benefits regardless of insurer
• No prescription coverage: You need a separate Part D drug plan

Side-by-Side Comparison: Medicare Advantage vs. Medigap

Cost Comparison: What You May Pay in 2026

Cost is often the first factor people consider. Here is how the two options typically compare:

Key cost insight: Medicare Advantage may cost less monthly, but you pay more when you use care (copays, coinsurance). Medigap costs more monthly, but shields you from high bills when you need treatment. Your total annual cost depends on how much healthcare you use.

Which Plan May Be Right for You?

5 Common Mistakes When Choosing Between Medicare Advantage and Medigap

1. Choosing based on premium alone: A $0 premium Medicare Advantage plan can cost thousands in copays and coinsurance if you get sick. Compare total annual costs, not just monthly premiums.
2. Waiting too long to enroll in Medigap: Your Medigap Open Enrollment Period starts when you turn 65 and enroll in Part B. During this 6-month window, insurers cannot deny you coverage or charge more for pre-existing conditions. Miss it, and you may face medical underwriting.
3. Ignoring network restrictions: Medicare Advantage HMO plans typically will not cover out-of-network care except in emergencies. If your preferred doctor is not in the network, you may need to switch providers.
4. Forgetting about prescription drugs: If you choose Medigap, you need a separate Part D prescription drug plan. Factor that additional premium and drug copays into your total cost comparison.
5. Not considering future health needs: Your healthcare needs may change. A healthy 65-year-old may find Medicare Advantage affordable, but costs can rise significantly with a serious diagnosis. Medigap provides more consistent cost protection over time.

Can You Switch Between Medicare Advantage and Medigap?

Yes, but the timing and conditions matter:

• Advantage to Medigap: You can leave Medicare Advantage during the Annual Enrollment Period (October 15 to December 7) or the Medicare Advantage Open Enrollment Period (January 1 to March 31). However, you may need to pass medical underwriting to get a Medigap plan unless you qualify for a guaranteed-issue right.
• Medigap to Advantage: You can switch to a Medicare Advantage plan during the Annual Enrollment Period. If your Medigap plan includes a “trial right” (you enrolled in Advantage within your first year of Medigap eligibility), you may have guaranteed-issue rights to return to Medigap within 12 months.

Important: Switching from Medicare Advantage to Medigap later in life may be more difficult and expensive due to medical underwriting. This is why the initial enrollment decision is so important.

Frequently Asked Questions