Medicare's Coverage of Weight Loss Drugs

Medicare Part D (prescription drug coverage) covers some weight loss medications, but not all of them, and coverage rules differ between plans. The drugs Medicare is most likely to cover are those originally approved by the FDA for diabetes or other conditions — like metformin, GLP-1 receptor agonists such as semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro) — because they treat multiple conditions. Drugs approved solely for weight loss, or older weight loss medications, face stricter limits or may not be covered at all.

Coverage also depends on which Part D plan you chose and whether your doctor's recommendation meets that plan's requirements. Some plans require prior authorization (your doctor must get permission before you fill the prescription), step therapy (you must try a cheaper drug first), or proof that you have tried diet and exercise. The amount you pay out of pocket varies by plan and by which tier the drug is placed on — typically tier 3 or 4 for newer weight loss drugs, meaning higher copays.

Key Takeaways

  • Medicare Part D covers some weight loss drugs, particularly GLP-1 medications like semaglutide and tirzepatide, but coverage rules vary by plan and change year to year.
  • Your specific plan's formulary (the list of covered drugs) determines whether a weight loss medication is covered at all, and at what cost tier.
  • Many plans require prior authorization or step therapy, meaning your doctor must request permission or you must try a cheaper option first.
  • You can check your plan's formulary online or call the plan directly to confirm coverage for a specific drug before your doctor prescribes it.

How to Find Out What Your Plan Covers

Each Part D plan publishes a formulary — a list of covered drugs organized by tier. Tier 1 drugs have the lowest copay, and tier 4 or 5 drugs have the highest. Weight loss medications, when covered, usually land on tier 3 or 4. You can find your plan's formulary on its website or by calling the customer service number on your insurance card.

When you call or search online, have the exact drug name and strength ready (for example, "semaglutide 1 mg injection" rather than just "Ozempic"). Ask three things: Is it on the formulary? What tier is it on? Does the plan require prior authorization or step therapy? If the drug is not covered, ask what alternatives the plan does cover for weight loss.

If you have not yet chosen a Part D plan, you can compare formularies during the annual enrollment period (October 15 to December 7 each year). Medicare's Plan Finder tool lets you enter a specific drug and see which plans in your area cover it and at what cost.

Prior Authorization and Step Therapy Requirements

Prior authorization means your doctor must submit a request to the insurance plan before you can fill the prescription. The plan reviews the request to confirm the drug is medically necessary. This process usually takes a few business days but can take longer if the plan requests additional medical records.

Step therapy is more restrictive: it requires you to try and fail on a cheaper drug first — often metformin or an older weight loss medication — before the plan will cover the newer GLP-1 drugs. Your doctor can request a step therapy exception if they believe a cheaper drug will not work for you, but this adds time and requires documentation.

Some plans waive these requirements if you have certain conditions (such as type 2 diabetes or heart disease) or if your doctor documents that you have already tried the step therapy drug. Always ask your doctor to check with the plan before writing the prescription, rather than discovering the requirement at the pharmacy.

What Weight Loss Drugs Medicare Part D Usually Covers

GLP-1 receptor agonists are the weight loss drugs most commonly covered by Medicare Part D plans. Semaglutide (marketed as Ozempic for diabetes, Wegovy for weight loss) and tirzepatide (Zepbound for weight loss, Mounjaro for diabetes) are on many formularies, though usually at a higher tier with a copay of $35 to $150 per month or more, depending on your plan and the dose.

Metformin, a diabetes drug that can aid weight loss, is typically covered at tier 1 or 2 with a low copay. Phentermine, an older appetite suppressant, is covered by some plans but often at a higher tier. Orlistat, an over-the-counter fat-blocking drug, is not usually covered by Part D because it is available without a prescription.

Newer drugs like retatrutide (Stegaro) may not yet be on most formularies because they were approved by the FDA very recently. Coverage for brand-new drugs typically expands over time as more plans add them, but there is no may provide. If a drug is not covered, your doctor can request a coverage exception, though approval is not certain.

The Donut Hole and Your Out-of-Pocket Costs

Part D coverage has a structure with four stages: the deductible (what you pay before coverage starts), the initial coverage period (where you and the plan share costs), the coverage gap (the "donut hole," where you pay more), and catastrophic coverage (where the plan pays most costs after you reach a spending threshold).

In 2024, the coverage gap begins after you and your plan have spent $5,850 combined on covered drugs. Once you enter the gap, you pay a higher percentage of the drug cost — currently 25 percent for most drugs, though this percentage changes year to year. For expensive weight loss medications, reaching the donut hole can mean a sharp jump in your copay.

The good news: once your out-of-pocket spending reaches $8,550 in 2024, you enter catastrophic coverage and the plan pays 95 percent of costs for the rest of the year. If you take a weight loss drug regularly, tracking your spending through the year helps you plan for the gap and know when you will reach catastrophic coverage.

What to Do If Your Plan Does Not Cover the Drug

If your plan's formulary does not include the weight loss drug your doctor recommended, you have several options. First, ask your doctor to request a coverage exception — a formal appeal to the plan asking it to cover the drug anyway. The plan will review your medical history and may approve the exception if your doctor documents that you have tried other drugs or have a condition that makes this drug medically necessary.

Second, check whether a generic or lower-tier version of the same drug is covered. For example, if brand-name Wegovy is not covered, the plan might cover generic semaglutide at a lower tier. Third, ask your doctor about alternative drugs that your plan does cover — there may be another GLP-1 medication or weight loss drug on the formulary.

Third, you can switch to a different Part D plan during the annual enrollment period (October 15 to December 7) if you find a plan that covers the drug you need. You are not locked into your current plan. If you need the drug urgently and cannot wait until October, you can request a special enrollment period, though these are granted only in specific circumstances (such as loss of other coverage).

Medicare Advantage Plans and Weight Loss Drug Coverage

If you have Medicare Advantage (Part C) instead of Original Medicare, your coverage for weight loss drugs works differently. Medicare Advantage plans include prescription drug coverage as part of the plan, so you do not choose a separate Part D plan. Coverage rules, formularies, and copays are set by the Advantage plan, not by Medicare.

Some Medicare Advantage plans cover weight loss drugs generously; others do not cover them at all or place them on very high tiers. You can check your plan's formulary the same way you would for Part D — on the plan's website or by calling customer service. If your current Advantage plan does not cover the drug you need, you can switch to a different Advantage plan or switch to Original Medicare plus a Part D plan during the annual enrollment period.

Frequently Asked Questions

Does Medicare cover Ozempic or Wegovy for weight loss?

Some Medicare Part D plans cover semaglutide (Ozempic, Wegovy), but not all. Coverage depends on your specific plan's formulary. Ozempic, approved for diabetes, is more likely to be covered than Wegovy, which is approved for weight loss alone. Call your plan or check its website to confirm whether semaglutide is covered and at what tier.

Will Medicare pay for weight loss drugs if I do not have diabetes?

Yes, Medicare Part D can cover weight loss drugs for people without diabetes, though some plans may require prior authorization or step therapy. Coverage is based on your plan's formulary, not on whether you have a specific condition. However, some plans may deny coverage if you do not meet their medical necessity requirements — your doctor can appeal these denials.

What if my doctor says I need a weight loss drug but my plan will not cover it?

Ask your doctor to request a coverage exception from the plan. The plan will review your medical records and may approve coverage if your doctor documents medical necessity. If the exception is denied, you can appeal the decision or switch to a different Part D plan during the annual enrollment period that does cover the drug.

How much will I pay out of pocket for a weight loss drug?

The copay depends on which tier your plan places the drug on and your plan's copay structure. Weight loss drugs are usually tier 3 or 4, with copays ranging from $35 to $150 or more per month. Some plans use coinsurance (a percentage of the cost) instead of a flat copay. Check your plan's formulary or call customer service for the exact copay for the specific drug and dose you need.

Can I get a weight loss drug without Medicare coverage?

Yes. You can pay out of pocket at a pharmacy, though weight loss drugs are expensive — semaglutide can cost $900 to $1,500 per month without insurance. Some manufacturers offer patient information programs or discount cards that reduce the cost. Ask your doctor or pharmacist whether the drug maker offers a discount program, or search the drug's official website.