Medicare Advantage vs Medigap: What to Compare

Medicare Advantage and Medigap are not two versions of the same product. Medicare Advantage is another way to receive Medicare Part A and Part B benefits through a Medicare-approved private plan. Medigap is supplemental insurance that works with Original Medicare to help pay certain cost-sharing. You cannot use Medigap to pay Medicare Advantage cost-sharing.

The two coverage structures

Path 1: Medicare Advantage

You remain in Medicare and must continue paying the Part B premium. The private plan administers Part A and Part B benefits and may include Part D prescription coverage. Networks, referrals, prior authorization, copayments, added benefits, service areas, and formularies vary by plan and can change by year.

Path 2: Original Medicare plus Medigap

Original Medicare pays first for covered Part A and Part B services, and the Medigap policy may pay certain remaining amounts according to its standardized plan type. Medigap policies generally do not include outpatient prescription drug coverage, so a separate Part D plan may be considered. Medigap does not replace Original Medicare.

Side-by-side questions

Question	Medicare Advantage	Original Medicare + Medigap
Provider access	Plan network and service-area rules may apply	Generally any U.S. provider that accepts Medicare, subject to the policy and Medicare rules
Prescription drugs	Often included, but not always	Usually requires a separate Part D plan
Annual out-of-pocket limit for Part A/B services	Plans have a yearly limit for covered Part A/B services; the amount varies	Original Medicare alone has no annual out-of-pocket maximum; Medigap pays according to its contract
Plan changes	Benefits, costs, networks, and formulary can change annually	Standardized core Medigap benefits do not change annually, but premiums can change; Part D still needs annual review
Underwriting timing	Medical underwriting generally is not used for Medicare Advantage enrollment, but enrollment rules apply	Outside protected enrollment or guaranteed-issue rights, medical underwriting may apply depending on state law and circumstances

The Medigap Open Enrollment Period matters

Your federal Medigap Open Enrollment Period is a one-time six-month period that starts the first month you have Medicare Part B and are age 65 or older. During this period, insurers generally cannot use medical underwriting to deny a Medigap policy or charge more because of health conditions. Other guaranteed-issue rights may apply in specific situations. State protections can be broader.

Do not compare only the monthly premium

Review the full annual picture: premiums, deductibles, copayments, coinsurance, maximum out-of-pocket exposure, expected services, prescriptions, provider participation, travel patterns, and administrative requirements. A lower premium does not automatically mean a lower total cost.

A practical annual checklist

• Confirm doctors, hospitals, pharmacies, and drugs using the current plan directories and formulary.
• Read the Annual Notice of Change and Evidence of Coverage.
• Check prior-authorization and referral rules.
• Review the plan’s service area if you travel or live in more than one location.
• Before leaving Medigap, confirm whether you could obtain it again and on what terms.

Request a neutral comparison

Explore Medicare guidance or request help from an agent. No single path is right for everyone.

Official Medicare sources

• Medicare.gov: Medigap basics
• Medicare.gov: When to buy Medigap
• Medicare.gov: Compare coverage options

Medicare notice: American Mutual Insurance Agency LLC is an independent insurance agency. We are not connected with or endorsed by the U.S. government or the federal Medicare program. This is general educational information, not a complete description of benefits. Plan availability, costs, networks, formularies, benefits, and eligibility vary. Medicare.gov, 1-800-MEDICARE, a licensed agent, and official plan documents must verify final details.