What Medicare Covers for Weight Loss Medications

Medicare's coverage of weight loss medications depends on which part of Medicare you have and whether your doctor prescribes the drug for an approved medical reason

Medicare Part B covers some weight loss medications, but not all of them, and coverage rules differ from state to state and plan to plan. The medications Medicare is most likely to cover are those prescribed to treat a specific health condition — such as diabetes or heart disease — rather than weight loss alone. Medications like semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro) fall into a gray area: Medicare may cover them if your doctor documents that you need them for diabetes or another approved condition, but coverage for weight loss as a standalone reason is less common.

The first step is to check your specific plan's formulary — the official list of medications your plan will help pay for. You can find this on your Medicare plan's website or by calling the plan directly. Your doctor will also need to submit a request to your plan explaining the medical reason for the prescription, a process called prior authorization.

Key Takeaways

Medicare Part B may cover weight loss medications if prescribed for an approved medical condition like diabetes, but coverage for weight loss alone is limited.
Each Medicare plan maintains its own formulary, so coverage varies; you must check your specific plan's list of covered drugs.
Your doctor must submit a prior authorization request explaining the medical reason for the prescription before the medication is covered.
Medicare Part D (prescription drug plans) covers some weight loss medications, but your out-of-pocket cost depends on which tier the drug is on in your plan.
If your plan denies coverage, you have the right to request an appeal, and your doctor can provide medical documentation to support the request.

How Medicare Part B covers weight loss medications

Medicare Part B covers medications that are injected or infused in a doctor's office or hospital outpatient setting. Some weight loss medications fall into this category. However, Part B coverage is typically limited to situations where the medication treats a diagnosed medical condition — not weight loss by itself.

For example, if you have type 2 diabetes and your doctor prescribes semaglutide (Ozempic) to manage your blood sugar, Medicare Part B may cover it. If you have heart disease and your doctor prescribes the same medication because it also reduces cardiovascular risk, Part B may cover it. But if your only reason for taking the medication is weight loss, Part B coverage becomes much less certain.

Your doctor will need to document the medical reason in your chart and submit it to Medicare for review. This is called prior authorization. Medicare will then decide whether the medical reason meets their coverage rules. The process usually takes 5 to 10 business days.

How Medicare Part D covers weight loss medications

Medicare Part D is the prescription drug plan that covers medications you take at home. Many weight loss medications are on Part D formularies, meaning your plan will help pay for them — but the amount you pay depends on which tier the drug is on.

Part D divides drugs into tiers, usually ranging from tier 1 (lowest cost) to tier 5 (highest cost). Newer weight loss medications like semaglutide and tirzepatide are often placed on higher tiers, which means your copay or coinsurance will be higher. Some plans place them on tier 4 or tier 5, where you might pay 25 to 50 percent of the drug's cost.

Before your doctor writes a prescription, ask your Part D plan whether the medication is covered and what your out-of-pocket cost will be. You can find this information on your plan's website or by calling the plan's customer service number on the back of your Medicare card. If the cost is too high, ask your doctor whether a lower-tier alternative exists or whether your plan will consider a lower tier through prior authorization.

Medications Medicare is most likely to cover

Medicare is more likely to cover weight loss medications when they are prescribed for a condition other than weight loss alone. The following medications have stronger coverage pathways:

Semaglutide (Ozempic, Wegovy): Ozempic is approved for type 2 diabetes and is often covered by Medicare Part B or Part D when prescribed for diabetes. Wegovy is the same drug at a higher dose, approved for weight loss only, and coverage is less common.
Tirzepatide (Mounjaro, Zepbound): Mounjaro is approved for type 2 diabetes and may be covered by Medicare when prescribed for diabetes. Zepbound is approved for weight loss only and has limited Medicare coverage.
Phentermine: This older medication is often on lower tiers of Part D plans and may have lower out-of-pocket costs, though it is typically prescribed for short-term use only.
Orlistat (Xenical, Alli): This medication is available over the counter and by prescription. The prescription version may be covered by some Part D plans, though many people buy the over-the-counter version instead.

The key difference is that medications approved for diabetes or other conditions have clearer coverage pathways than medications approved for weight loss alone. If your doctor prescribes a medication for its approved medical use, your chances of coverage are higher.

What happens if Medicare denies coverage

If your plan denies coverage for a weight loss medication, you have the right to request an appeal. The appeal process is different depending on whether you have Part B coverage or Part D coverage, but both allow you to challenge the decision.

For Part B denials, you can file an appeal with Medicare directly. Your doctor can submit additional medical documentation explaining why the medication is medically necessary for your condition. This might include lab results, imaging reports, or notes about previous treatments you have tried.

For Part D denials, you can file an appeal with your prescription drug plan. Again, your doctor's documentation is important. Some plans will reconsider a denial if your doctor provides evidence that the medication is medically necessary or that you have tried other medications without success. This process is called an exception request or formulary exception.

The appeal process usually takes 30 to 60 days. During this time, ask your doctor whether there is a lower-cost alternative medication you could try while you wait for the decision.

Out-of-pocket costs and ways to reduce them

If Medicare covers your weight loss medication, your out-of-pocket cost depends on your plan type and the drug's tier. Part B medications typically require a 20 percent coinsurance after you meet your deductible. Part D medications require a copay or coinsurance that varies by tier.

Several strategies can help reduce your costs. First, compare plans during the annual enrollment period (October 15 to December 7 each year) to find a plan with lower copays for your specific medication. Second, ask your doctor whether a generic version or lower-tier alternative is available. Third, check whether the medication's manufacturer offers a patient information program or coupon that can reduce your out-of-pocket cost.

Some manufacturers of weight loss medications offer copay cards that cap your monthly cost at a certain amount, even if your insurance copay is higher. Ask your doctor's office or pharmacist whether this option is available for your medication.

Frequently Asked Questions

Does Medicare cover Ozempic or Wegovy for weight loss?

Medicare may cover Ozempic if your doctor prescribes it for type 2 diabetes, but coverage for Wegovy (the weight-loss version of the same drug) is less common. Coverage depends on your specific plan and whether your doctor can document a medical reason beyond weight loss alone.

What is prior authorization and why do I need it?

Prior authorization is a request your doctor submits to Medicare or your plan before you start a medication. The plan reviews the request to confirm the medication is medically necessary and covered under your plan. Without prior authorization, your claim may be denied even if the medication is on your plan's formulary.

Can I switch Medicare plans to get better coverage for weight loss medications?

Yes. During the annual enrollment period (October 15 to December 7), you can switch to a different Part D plan or Medicare Advantage plan that may have better coverage or lower copays for your medication. Compare plans on Medicare.gov to see which plans cover your specific drug and at what cost.

What should I do if my plan's copay is too high?

Talk to your doctor about lower-cost alternatives, ask whether the medication's manufacturer offers a copay card, and check whether your plan will make an exception to place the drug on a lower tier. You can also appeal the plan's tier placement or switch to a different plan during the next enrollment period.

Are weight loss medications covered under Medicare Advantage plans?

Medicare Advantage plans must cover at least the same medications as Original Medicare, but each plan's formulary and copays are different. Check your specific plan's formulary to see which weight loss medications are covered and what your cost will be.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.