AARP Medicare Supplement Insurance: Coverage, Plan Options, Costs, and Enrollment Rules

AARP Medicare Supplement Insurance plans, insured by UnitedHealthcare, help pay for out-of-pocket medical costs that Original Medicare (Part A and Part B) does not cover. These standardized Medigap policies assist enrollees with deductibles, copayments, and coinsurance, offering predictable healthcare expenses, nationwide doctor choice, and guaranteed policy renewability regardless of changing health conditions.

What Is AARP Medicare Supplement Insurance?

Original Medicare provides essential hospital (Part A) and medical (Part B) coverage, but it was never designed to pay for 100% of an individual's healthcare expenses. Under Original Medicare, beneficiaries face deductibles, daily hospital copayments, and an unbounded 20% coinsurance on most outpatient services. Because Original Medicare has no annual out-of-pocket maximum, an unexpected surgical procedure or chronic illness can create substantial financial liability.

Medicare Supplement Insurance—commonly referred to as Medigap—is private health insurance designed to fill these coverage gaps. AARP Medicare Supplement Insurance policies are branded by AARP and exclusively underwritten and insured by UnitedHealthcare Insurance Company (or its affiliated regional entities).

Through this alliance, AARP grants UnitedHealthcare the license to use its brand, while UnitedHealthcare manages plan administration, claims payment, customer service, and regulatory compliance.

1. Original Medicare
   • Part A (Hospital)
   • Part B (Medical)
2. Out-of-Pocket Gaps Left Unpaid
   • Deductibles, 20% Coinsurance, Copays, Foreign Travel Risk
3. AARP Medicare Supplement (Medigap)
   • Insured by UnitedHealthcare Insurance Co.
   • Pays approved gaps based on standard lettered plans

Key Functional Characteristics of AARP Medigap Plans

1. Nationwide Network Access: Medigap plans do not use restricted provider networks (like HMOs or PPOs). You can visit any physician, specialist, or hospital in the United States that accepts Original Medicare.
2. No Referral Requirements: Enrollees can consult specialists directly without obtaining prior authorization or referrals from a primary care doctor.
3. Guaranteed Renewability: As long as you pay your premiums on time, UnitedHealthcare cannot cancel your policy or change your coverage due to new health conditions, age, or claims history.
4. Standardized Benefits: Federal and state laws require Medigap plans to be standardized by letter (Plan A, Plan B, Plan G, Plan N, etc.). An AARP Plan G covers the exact same core benefits as any other carrier's Plan G, though pricing, customer service, and extra non-insurance perks differ.

What AARP Medigap Does and Does Not Cover

Understanding the boundaries of Medicare Supplement Insurance is essential when evaluating overall healthcare protection.

What It Covers

Depending on the specific lettered plan selected, an AARP Medigap policy pays some or all of the following Medicare-approved costs:

• Medicare Part A Coinsurances and Hospital Costs: Up to an additional 365 days after Original Medicare benefits are exhausted.
• Medicare Part B Coinsurance or Copayments: Typically 20% of the Medicare-approved amount for doctor visits, outpatient surgery, and durable medical equipment.
• Blood: The first three pints of blood needed each year for a medical procedure.
• Part A Hospice Care Coinsurance or Copayments: Coverages for respite care and prescription drugs used for symptom control during hospice.
• Skilled Nursing Facility (SNF) Care Coinsurance: Daily copayments required for days 21 through 100 in a Medicare-certified facility.
• Medicare Part A Deductible: The hospital inpatient deductible per benefit period.
• Medicare Part B Excess Charges: Fees charged by providers who participate in Medicare but do not accept "assignment" (charging up to 15% above the Medicare-approved rate).
• Foreign Travel Emergency Care: Coverage for urgent or emergency care received outside the United States (subject to plan limits, deductibles, and lifetime maximums).

What It Does Not Cover

Medigap policies are strictly designed to supplement Original Medicare Part A and Part B expenses. They do not cover:

• Prescription Drugs: Stand-alone Medicare Part D policies must be purchased separately for outpatient prescription coverage.
• Routine Dental, Vision, and Hearing Services: Exams, eyeglasses, hearing aids, and dental fillings are not part of standard Medigap benefits (though some AARP plans offer separate non-insurance discount programs for these services).
• Long-Term Care: Custodial care in a nursing home or home healthcare for daily living assistance (bathing, dressing) is excluded.
• Private-Duty Nursing: Non-covered bedside care during hospitalizations.

Breakdown of Standardized AARP Medigap Plan Options

While federal rules establish standardized Medigap plans labeled A through N, plan availability can vary depending on state regulations and the applicant's Medicare eligibility date. Massachusetts, Minnesota, and Wisconsin use their own state-specific standardization models rather than the lettered plan system.

Pre-2020 vs. Post-2020 Eligibility Rules

Under the Medicare Access and CHIP Reauthorization Act of 2015 (MACRA), Medigap plans that pay the Medicare Part B deductible (specifically Plan F and Plan C) cannot be sold to individuals who became newly eligible for Medicare on or after January 1, 2020.

• If you turned 65 or became eligible for Medicare BEFORE January 1, 2020: You remain eligible to apply for AARP Plan F or Plan C.
• If you became eligible for Medicare ON OR AFTER January 1, 2020: You cannot purchase Plan F or Plan C. Instead, Plan G serves as the most comprehensive option available to you.

Detailed Overview of Popular AARP Plans

Plan G (Most Comprehensive for New Enrollees)

Plan G has become the standard choice for beneficiaries seeking maximum financial protection. It covers every gap in Original Medicare except for the annual Part B deductible. Once you pay the initial Part B deductible out-of-pocket each calendar year, Plan G pays 100% of all covered medical costs for the remainder of that year. Plan G also covers Part B excess charges.

Plan N (Cost-Sharing Alternative)

Plan N offers lower monthly premiums than Plan G in exchange for modest cost-sharing. Under Plan N:

• You pay the annual Part B deductible.
• After the deductible is met, you may pay a copayment of up to $20 for certain doctor visits and up to $50 for emergency room visits (the ER copay is waived if you are admitted to the hospital).
• Plan N does not cover Part B excess charges. If you see a doctor who does not accept Medicare assignment, you must pay the excess charge out-of-pocket.

Plan F (Legacy First-Dollar Coverage)

Historically the most popular plan, Plan F covers 100% of all Medicare Part A and Part B gaps, including the Part B deductible. Policyholders with Plan F experience zero out-of-pocket costs for Medicare-covered services. However, due to its restriction to individuals eligible before 2020, premium rate increases for Plan F can outpace other plans as the pool of enrollees ages.

Plan A and Plan B (Core Entry-Level Plans)

Plan A provides basic core benefits, primarily covering Part A hospital coinsurance, Part B coinsurance, and hospice coinsurance. It does not cover the Part A or Part B deductibles, skilled nursing care coinsurance, or foreign travel emergencies. Plan B includes all Plan A benefits plus coverage for the Part A hospital deductible.

Plan K and Plan L (Cost-Sharing Plans)

Plans K and L feature lower monthly premiums but require enrollees to share a percentage of costs up to an annual out-of-pocket limit. Plan K covers 50% of most gaps, while Plan L covers 75%. Once the out-of-pocket cap is reached in a calendar year, the plan pays 100% of Medicare-covered services.

Comparative Coverage Matrix

The following table details the benefits provided by standardized Medigap plans offered by UnitedHealthcare under the AARP brand.

*Plan F is only available to individuals eligible for Medicare before January 1, 2020.**Plan N pays 100% of Part B coinsurance, except for a copayment of up to $20 for office visits and up to $50 for emergency room visits.

Premium Pricing Structures and Cost Factors

Medigap policy costs vary depending on the insurance provider, location, and plan type. Insurance companies use one of three rating systems to set monthly premiums:

1. Community-Rated (No-Age-Rated)

Under community rating, every policyholder living in a specific geographic zone who buys the same plan pays the same monthly premium, regardless of age. Premiums may rise over time due to inflation and healthcare costs, but not because you grow older.

2. Issue-Age-Rated

Premiums are based on the age you are when you purchase the policy. Younger buyers lock in lower base rates. Prices will not increase purely because of aging, though rate adjustments for medical inflation can still occur.

3. Attained-Age-Rated

Premiums are based on your current age and automatically increase as you grow older. Attained-age plans often start with lower rates at age 65 but can become significantly more expensive over time compared to community-rated or issue-age-rated plans.

Note on AARP / UnitedHealthcare Pricing: UnitedHealthcare utilizes different rating structures depending on state law. In many states, AARP Medigap policies follow a modified community rating or issue-age model, often incorporating tiered early-enrollment discounts for individuals enrolling at age 65.

Factors Influencing Your Premium

• Geographic Location: ZIP code and county significantly affect costs due to local medical service pricing.
• Gender: In states where permitted, women often pay slightly lower premiums than men due to differences in life expectancy and claim patterns.
• Tobacco Use: Smokers and tobacco users generally pay higher premiums than non-users.
• Discounts: AARP/UnitedHealthcare frequently offers premium discounts, such as:
  • Household Discounts: Available when multiple household members maintain active AARP Medigap plans.
  • Electronic Funds Transfer (EFT) Discounts: A small monthly savings for enrolling in automated bank draft payments.
  • AARP Membership Fee: You must be an active member of AARP to purchase and maintain an AARP Medicare Supplement policy. The standard AARP membership fee (typically around $16 annually) is separate from your insurance premium.

Enrollment Timelines: Open Enrollment vs. Underwriting

Timing your Medigap enrollment properly is essential to avoid medical underwriting and potential coverage denial.

1. Medigap Open Enrollment Period (6 Months)
   • Starts the month you are BOTH 65+ and enrolled in Medicare B.
   • Guaranteed Issue:
     • No medical underwriting
     • Cannot be denied coverage
     • Pre-existing conditions covered
2. Outside Open Enrollment
   • Guaranteed Issue Event? (e.g., loss of employer plan)
     • No Underwriting Required
     • Guaranteed Acceptance
   • No Special Circumstances? (Standard Application)
     • Medical Underwriting
     • Can be denied or charged higher rates for health history

The Medigap Open Enrollment Period (OEP)

Your best opportunity to buy an AARP Medicare Supplement policy is during your Medigap Open Enrollment Period. This six-month period automatically begins on the first day of the month in which you are both age 65 or older and enrolled in Medicare Part B.

During your Medigap OEP:

• You have a Guaranteed Issue Right.
• UnitedHealthcare cannot refuse to sell you any Medigap plan offered in your state.
• The insurer cannot charge you higher monthly premiums based on pre-existing health conditions, medical history, or prescription drug usage.
• Pre-existing condition waiting periods are generally waived if you had continuous prior creditable coverage.

Applying Outside Open Enrollment (Medical Underwriting)

If you apply for an AARP Medigap policy outside your six-month Open Enrollment Period—and do not qualify for a Guaranteed Issue Right—UnitedHealthcare requires you to complete a medical questionnaire.

During this process, known as medical underwriting:

• The insurer evaluates your health history, medical records, and current medications.
• UnitedHealthcare may accept your application, charge a higher monthly premium based on health risks, or reject your application entirely.

Guaranteed Issue Rights (Special Protections)

Under specific circumstances defined by the Centers for Medicare & Medicaid Services (CMS), you maintain Guaranteed Issue Rights outside your standard OEP. Key scenarios include:

• Loss of Employer Group Coverage: You lose health coverage from an employer or union that was primary to Medicare.
• Leaving a Medicare Advantage Plan: You move out of your Medicare Advantage plan’s service area, or your plan leaves the Medicare program.
• Trial Rights: You joined a Medicare Advantage plan when first eligible for Medicare at age 65, and you decide to switch to Original Medicare within your first 12 months of joining.
• Involuntary Plan Loss: Your Medigap insurance company goes bankrupt or violates its policy contract.

Member Perks and Extra Value-Added Benefits

Beyond standard insurance benefits, AARP Medicare Supplement plans insured by UnitedHealthcare include access to extra non-insurance programs. These perks vary by state but commonly include:

• Gym and Fitness Programs: Access to participating fitness facilities and online wellness classes through services such as Renew Active® by UnitedHealthcare.
• Dental, Vision, and Hearing Discounts: Access to discount networks providing reduced fees for routine dental procedures, vision exams, frames, lenses, and hearing instruments.
• 24/7 NurseLine: Direct phone access to registered nurses for non-emergency medical guidance and advice at no additional charge.
• Driver Safety Courses: Discounted rates on AARP Smart Driver™ courses, which can help improve driving skills and potentially lower auto insurance premiums in participating states.

Disclaimer: Non-insurance benefits and services are optional, subject to change, and are not part of the standardized Medigap policy contract. State availability varies.

Step-by-Step Decision Guide: Choosing the Right AARP Plan

To select the Medicare Supplement policy that best fits your medical needs and budget, follow this practical step-by-step process:

Step 1: Verify Your Medicare Part A and Part B Eligibility

Ensure you are officially enrolled in Medicare Part A and Part B. Note your Part B effective date, as this triggers your 6-month Medigap Open Enrollment Period.

Step 2: Determine Your Risk Tolerance and Budget

• If you want predictable costs: Plan G provides maximum coverage for post-2020 enrollees, leaving you with only the Part B deductible to pay out-of-pocket each year.
• If you want lower monthly premiums and don't mind small copays: Plan N offers premium savings in exchange for minor copayments at physician offices and emergency rooms, along with out-of-pocket responsibility for Part B excess charges.

Step 3: Compare Local Pricing and Discounts

Request price quotes for AARP/UnitedHealthcare plans in your specific ZIP code. Be sure to ask about available household discounts, electronic auto-pay discounts, and community-rating structures in your state.

Step 4: Evaluate Prescription Drug (Part D) Needs

Remember that Medigap policies do not include coverage for outpatient prescription medications. Pair your Medigap policy selection with a stand-alone Medicare Part D Prescription Drug Plan to avoid late enrollment penalties.

Step 5: Check Provider Acceptance

Confirm that your preferred doctors, specialists, and hospital systems participate in Original Medicare. If a provider accepts Original Medicare, they automatically accept your AARP Medigap plan.

Frequently Asked Questions

Is AARP Medicare Supplement Insurance the same as Medicare Advantage?

No. AARP Medicare Supplement Insurance (Medigap) works alongside Original Medicare (Part A and Part B) to cover out-of-pocket costs like copayments and deductibles. You retain Original Medicare as your primary insurer.

In contrast, Medicare Advantage (Part C) replaces Original Medicare as your primary coverage, delivering benefits through a private managed care network (HMO or PPO) with its own copays, deductibles, and network restrictions. You cannot hold a Medigap policy and a Medicare Advantage plan at the same time.

Do I need to be an AARP member to buy an AARP Medicare Supplement policy?

Yes. AARP Medicare Supplement plans are available exclusively to active AARP members. If you are not currently a member, you can join AARP during the insurance application process.

Does an AARP Medigap plan cover prescription drugs?

No. Standardized Medigap policies sold today do not cover outpatient prescription drugs. To get drug coverage, you should enroll in a separate, stand-alone Medicare Part D plan.

Can UnitedHealthcare cancel my Medigap policy if my health worsens?

No. All standardized Medigap policies are guaranteed renewable. As long as you pay your premiums on time and made true statements on your application, UnitedHealthcare cannot cancel your plan or reduce your benefits due to changes in your health status.

What is the difference between Plan G and Plan N?

Plan G covers all Original Medicare out-of-pocket gaps except the annual Part B deductible. It also covers Part B excess charges. Plan N has lower monthly premiums than Plan G, but requires you to pay the Part B deductible, copays up to $20 for office visits and $50 for ER visits, and any Part B excess charges.

Will my AARP Medigap policy cover me if I travel outside the United States?

Plans C, D, F, G, M, and N cover foreign travel emergency medical care. The policy covers 80% of the billed expenses for medically necessary emergency care received outside the U.S. after you pay a $250 annual deductible, up to a lifetime maximum benefit of $50,000.

Summary and Next Steps

AARP Medicare Supplement Insurance plans insured by UnitedHealthcare offer nationwide medical access, predictable healthcare costs, and financial protection against unexpected hospital and outpatient expenses. For most individuals entering Medicare, Plan G provides the most comprehensive benefit package, while Plan N serves as a cost-effective alternative for those willing to handle minor copayments.

To take action on your Medicare coverage:

1. Confirm your Medicare Part B start date to identify your Medigap Open Enrollment window.
2. Review local premium rates for AARP/UnitedHealthcare plans in your state via the official AARP/UnitedHealthcare portal or Medicare's Plan Finder Tool.
3. Compare Medigap plan premiums against stand-alone Medicare Part D drug plans to build a comprehensive coverage profile.
4. If you are within your 6-month Open Enrollment window, complete your application early to secure guaranteed acceptance without medical underwriting.