Neither plan is universally "better" — the right choice depends on your doctors, your prescription drugs, and what you are willing to pay each month

Aetna and Humana are both large insurers offering Medicare Supplement plans in most states, but they differ in which doctors and hospitals they cover, their monthly premiums, and how they handle prescription drugs. One plan may cost $30 less per month but cover only one of your three doctors. Another may cover all your doctors but charge $60 more. The "better" plan is the one that covers the people and medications you actually use, at a price you can afford.

This guide walks you through the real differences between these two insurers so you can compare them side by side using your own situation — not a general ranking.

Key Takeaways

  • Aetna and Humana offer the same standardized Medicare Supplement plan types (Plan A, Plan B, Plan G, and others), but their networks, premiums, and customer service vary by state and region.
  • Your current doctors and hospitals may be in one plan's network but not the other, which often matters more than the monthly premium difference.
  • Prescription drug coverage is handled through a separate Part D plan with both insurers, not included in the Medicare Supplement itself.
  • Premium costs for the same plan type can differ by $50 or more per month between the two insurers, and both raise rates annually.
  • You can switch between plans during the annual Open Enrollment Period (October 15 to December 7) or if you may have access to for a Special Enrollment Period.

How Medicare Supplement plans work with Aetna and Humana

A Medicare Supplement plan (also called Medigap) sits between you and Medicare. When you go to the doctor, Medicare pays its share first, then your Medigap plan pays some or all of what Medicare does not cover. The plan type — Plan A, Plan B, Plan G, Plan N — determines what costs the plan will cover. Both Aetna and Humana offer the same plan types, so Plan G from Aetna covers the same benefits as Plan G from Humana.

What differs is the network — the list of doctors and hospitals each insurer has contracted with. If your cardiologist is in Humana's network but not Aetna's, Humana will pay its share of the bill and Aetna will not. You are responsible for any difference. This is why checking your doctors' names against each plan's network is the first step, before you look at price.

Both insurers also require you to have Original Medicare (Part A and Part B) to buy a Medigap plan. You cannot use a Medicare Supplement with a Medicare Advantage plan.

Comparing networks in your area

Aetna and Humana maintain separate provider directories — lists of doctors, hospitals, and specialists they cover. These lists change, and they vary significantly by state and county. A Humana network in Florida may be much larger than a Humana network in Montana, and the same is true for Aetna.

To compare networks, visit each insurer's website and use their provider search tool. Enter your primary care doctor's name, your specialists' names, and your preferred hospital. Write down which doctors appear in which plan. If all three of your regular doctors are in Humana's network but only one is in Aetna's, Humana is the practical choice regardless of monthly cost.

If you cannot find a doctor's name in either directory, call the doctor's office directly and ask which Medicare Supplement insurers they accept. Some doctors are in-network for one insurer but not listed correctly online, and the office staff can clarify.

Premium costs and how they change

Both Aetna and Humana set their own premiums for the same plan type. In the same zip code, Plan G from Aetna might cost $145 per month while Plan G from Humana costs $165 per month — or vice versa. The difference can range from $20 to $80 per month depending on your location and age. Over a year, that adds up to $240 to $960.

Premiums are not fixed. Both insurers raise rates annually, and the increase varies. One year Aetna might raise rates 3 percent and Humana 6 percent; the next year it could reverse. You will receive a notice each fall about your new rate for the coming year. If the increase is steep, you can switch to a different plan or insurer during Open Enrollment (October 15 to December 7).

Age also affects premiums. Some insurers use age-attained pricing, which means your premium goes up each birthday. Others use issue-age pricing, which means your rate is locked to your age when you first buy the plan and does not increase with age — only with general rate increases. Ask each insurer which pricing method they use in your state.

Prescription drug coverage through Part D

Neither Aetna nor Humana includes prescription drug coverage in a Medicare Supplement plan. Drug coverage comes through a separate Part D plan, which you buy independently. Both insurers offer Part D plans, but you do not have to buy Part D from the same company as your Medigap plan.

Some people buy Aetna Medigap and Humana Part D, or vice versa. Compare Part D plans separately using the Medicare Plan Finder tool at Medicare.gov. Enter your current medications and see which plans cover them and at what cost. Part D premiums and drug coverage change every year, so you should review your Part D plan each October during Open Enrollment, even if you keep the same Medigap plan.

Customer service and claims handling

Both Aetna and Humana operate customer service phone lines, but response times and ease of reaching a person vary. Some people report faster claims processing with one insurer; others have the opposite experience. Online reviews can be helpful but are often written by people with problems, not satisfied customers.

Before you choose, call each insurer's customer service line and ask a specific question — for example, how long claims typically take to process, or how to check a claim status online. The quality of the conversation may tell you something about how they handle problems later. You can also ask your doctor's office which insurer they find easier to work with; office staff deal with claims daily and have real experience.

When you can switch between plans

You can change your Medicare Supplement plan during the Annual Open Enrollment Period, which runs from October 15 to December 7 each year. Changes take effect January 1. You can switch from Aetna to Humana, from Humana to a different plan type, or make any other change during this window.

You may also may have access to for a Special Enrollment Period if certain life events occur — for example, if you move out of your plan's service area, if your employer coverage ends, or if you lose Medicaid. Special Enrollment Periods last 60 days from the may have access to event and allow you to change plans outside the normal October-December window.

If you switch plans, your new coverage begins on the first day of the following month. There is no waiting period or medical underwriting for Medicare Supplement plans, so you cannot be denied based on health conditions.

Frequently Asked Questions

Can I use Aetna or Humana Medigap with any doctor?

No. You must use doctors and hospitals in your plan's network. If you see an out-of-network provider, the plan will not pay its share and you will owe the full bill. Check your doctors' names in the network before you enroll.

Do Aetna and Humana cover the same things in Plan G?

Yes. Plan G is standardized by Medicare, so both insurers cover the same benefits — Part B deductible, coinsurance, copays, and excess charges. The difference is the network and the premium. The benefits are identical.

What happens to my Medigap plan if I move to a different state?

Your current plan may not be available in your new state, or the network may not include your new doctors. Contact your insurer at least 30 days before you move and ask whether your plan is available in your new location. If not, you can switch to a different plan or insurer during your Special Enrollment Period.

Can I have both Aetna and Humana Medigap plans at the same time?

No. You can have only one Medicare Supplement plan at a time. If you enroll in a new plan, your old plan automatically ends. You cannot "double cover" or hold two plans simultaneously.

How do I know if my doctor accepts Aetna or Humana?

Use each insurer's online provider directory to search by name, or call your doctor's office directly. Office staff can tell you when ready which Medicare Supplement insurers they accept. This is the fastest and most reliable way to check.