Medicare's coverage of weight loss drugs depends on the specific medication and your reason for taking it

Medicare Part D (prescription drug coverage) covers some weight loss medications, but not all of them, and coverage rules differ by plan. The key distinction is whether you are taking the drug to treat obesity as a medical condition or for weight loss alone. Medicare is more likely to cover a medication if your doctor prescribes it to manage a related health problem — such as type 2 diabetes or heart disease — rather than weight loss by itself.

The medications most commonly discussed for weight loss — semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro) — have different coverage paths depending on which version you use and which Medicare plan you have. Your individual plan's formulary (the list of covered drugs) determines what is actually covered in your situation.

Key Takeaways

  • Medicare Part D covers some weight loss medications, but coverage varies by plan and depends on whether the drug is prescribed for obesity, diabetes, or another medical condition.
  • Semaglutide and tirzepatide are covered by many Medicare plans when prescribed for type 2 diabetes, but coverage for weight loss alone is less common and plan-specific.
  • You will need to check your specific plan's formulary or call your plan directly to learn whether a particular medication is covered and what your out-of-pocket cost will be.
  • If your plan does not cover a medication your doctor recommends, you can ask your doctor to request a coverage exception, though approval is not may provide.

How Medicare decides what weight loss drugs to cover

Medicare Part D plans are run by private insurance companies, and each plan creates its own formulary — the official list of medications it will pay for. Because of this, coverage for weight loss drugs is not uniform across all Medicare beneficiaries. One plan may cover semaglutide for weight loss while another covers it only for diabetes.

The Food and Drug Administration (FDA) has approved certain medications specifically for weight management: semaglutide (Wegovy), tirzepatide (Zepbound), phentermine, and a few others. However, FDA approval does not automatically mean Medicare will cover it. Medicare Part D plans decide independently whether to include each drug on their formulary and under what conditions.

When a medication is approved for multiple uses — such as semaglutide for both diabetes and weight loss — plans may cover it for one use but not the other. This is called a medical necessity restriction. Your plan might cover semaglutide if you have type 2 diabetes but not if you are taking it for weight loss alone.

Semaglutide and tirzepatide: what Medicare typically covers

Semaglutide comes in two brand names: Ozempic (for diabetes) and Wegovy (for weight loss). Many Medicare Part D plans cover Ozempic for type 2 diabetes because it lowers blood sugar. Wegovy, the same drug at the same dose but marketed for weight loss, is covered by fewer plans and often requires prior authorization — a process where your doctor must request permission from the insurance company before you fill the prescription.

Tirzepatide has a similar split: Mounjaro is approved for type 2 diabetes, and Zepbound is approved for weight loss. Plans that cover Mounjaro for diabetes may not cover Zepbound for weight loss. Some plans cover tirzepatide only when prescribed for diabetes, even though the medication works the same way regardless of the indication.

Prior authorization is common for both drugs when prescribed for weight loss. This means your doctor submits a request to your plan explaining why the medication is medically necessary. The plan then decides whether to approve it. The process typically takes a few business days to a week, though it can be longer if the plan requests additional information from your doctor.

Other weight loss medications Medicare may cover

Phentermine, an older stimulant-based weight loss medication, is covered by many Medicare Part D plans because it is inexpensive and has been in use for decades. It is typically approved for short-term use (12 weeks or less) and is not a GLP-1 receptor agonist like semaglutide or tirzepatide.

Orlistat (Xenical, Alli) is another option that some plans cover. It works differently from semaglutide and tirzepatide — it reduces the amount of fat your body absorbs from food rather than affecting appetite. Some versions are available over-the-counter, which means they are not covered by Medicare Part D, but prescription-strength orlistat may be covered by your plan.

Naltrexone-bupropion (Contrave) is a combination medication that some plans cover, though coverage is less common than for semaglutide or phentermine. Your doctor can tell you which medications are options for your specific health situation and which ones your plan is likely to cover.

How to find out what your plan covers

The fastest way to learn whether your Medicare plan covers a specific weight loss medication is to check your plan's formulary online or call the plan directly. Your plan's customer service number is on your Medicare card. Have the medication name and strength ready when you call — for example, "semaglutide 0.5 mg" or "tirzepatide 2.5 mg."

When you call, ask three things: whether the medication is on the formulary, whether it requires prior authorization, and what your out-of-pocket cost will be (copay or coinsurance). Out-of-pocket costs for weight loss drugs can be substantial — some plans charge $50 to $100 per month or more, depending on the medication and your plan's cost-sharing structure.

You can also use Medicare's online Plan Finder tool at Medicare.gov. Enter your zip code and the specific medication name, and the tool will show you which plans in your area cover it. This is useful if you are comparing plans during the annual enrollment period (October 15 to December 7 each year).

What to do if your plan does not cover the medication your doctor recommends

If your doctor prescribes a weight loss medication that your plan does not cover, you have several options. The first is to ask your doctor to submit a prior authorization request or coverage exception request. Your doctor explains to the plan why the medication is medically necessary for you — for example, because you have obesity and type 2 diabetes, or because you have tried other medications without success.

Plans must respond to coverage exception requests within 72 hours for urgent requests and 30 days for standard requests. However, approval is not may provide. If the plan denies the request, your doctor can appeal the decision, though this adds time to the process.

Another option is to pay out of pocket. Some people choose to do this if the medication is important to their health and their plan will not cover it. Prices vary widely depending on the pharmacy and the medication — some discount programs and manufacturer coupons may lower the cost, though these are not always available to Medicare beneficiaries.

Medicare Part B and weight loss: a separate path

Medicare Part B (hospital and doctor visits) does not typically cover weight loss drugs, but it may cover weight loss counseling in certain situations. If you have obesity and related conditions such as diabetes or heart disease, your primary care doctor can refer you to a registered dietitian for counseling, and Medicare Part B may cover some of those visits.

This is different from drug coverage, but it is worth knowing about because counseling combined with medication often works better than either approach alone. Ask your doctor whether you are a candidate for covered nutrition counseling while you are exploring medication options.

Frequently Asked Questions

Does Medicare cover Ozempic or Wegovy for weight loss?

It depends on your specific plan. Many plans cover Ozempic (semaglutide for diabetes) but not Wegovy (semaglutide for weight loss). Some plans cover both, and some cover neither. Check your plan's formulary or call your plan's customer service number to find out.

Will I need prior authorization to get a weight loss drug?

Possibly. Many Medicare plans require prior authorization for weight loss medications, especially newer ones like semaglutide and tirzepatide. Your doctor can submit this request, and the plan usually responds within a few days to a week. Prior authorization does not mean the plan will deny coverage — it is a review step.

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

Ask your doctor to submit a coverage exception request explaining why the medication is medically necessary for you. The plan must respond within 72 hours for urgent requests. If denied, your doctor can appeal. You can also pay out of pocket or ask your doctor about alternative medications your plan does cover.

Are weight loss drugs covered under Medicare Part A or Part B?

No. Weight loss drugs are covered only under Medicare Part D (prescription drug coverage). Medicare Part B may cover weight loss counseling from a registered dietitian if you have obesity and related conditions, but not the medications themselves.

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

It varies by plan and medication. Some plans charge a copay (a fixed amount like $25 or $50), while others use coinsurance (a percentage of the drug's cost). Call your plan to ask about the specific cost for the medication your doctor recommends. Costs can range from $25 to over $100 per month.