Medicare's coverage of weight loss drugs depends on the specific drug 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 have changed in recent years. The key difference is whether Medicare sees the drug as treating obesity itself or treating a related condition like type 2 diabetes. A drug like semaglutide (Ozempic, Wegovy) may be covered under one circumstance but not another, depending on which version you are taking and what your doctor documents as the reason for prescribing it.

Coverage also depends on which Medicare plan you have and which pharmacy you use. Your Part D plan's formulary — the official list of drugs it covers — determines what you pay. Some plans cover weight loss drugs with no restrictions; others require prior authorization from the plan before you fill the prescription; still others do not cover them at all.

Key Takeaways

  • Medicare Part D covers some weight loss medications, but your specific plan's formulary determines whether your drug is covered and what you pay out of pocket.
  • Semaglutide (Ozempic) prescribed for type 2 diabetes is more likely to be covered than semaglutide (Wegovy) prescribed for weight loss alone, because Medicare distinguishes between the two uses.
  • You must contact your Part D plan directly or ask your pharmacy to check coverage before filling a prescription, because coverage varies widely between plans.
  • If your plan does not cover a drug your doctor prescribes, you can ask your doctor to request a coverage exception, though approval is not may provide.
  • Some weight loss drugs are not covered by any Medicare plan because they are not approved by Medicare as medically necessary for seniors.

How Medicare decides which weight loss drugs to cover

Medicare Part D plans use a process called prior authorization to decide whether to cover a drug for your specific situation. When your doctor prescribes a weight loss medication, the pharmacy sends a request to your plan. The plan's pharmacist reviews the prescription and your medical history to decide whether it meets the plan's coverage rules.

For weight loss drugs, the distinction between treating obesity and treating another condition matters. If your doctor prescribes semaglutide because you have type 2 diabetes and high blood sugar, your plan is more likely to cover it as a diabetes treatment. If the same drug is prescribed because you are overweight but do not have diabetes, coverage is less certain. Medicare plans treat these as different medical reasons, even though the drug is identical.

Some plans also use step therapy, which means you must try a cheaper drug first before the plan will cover a more expensive one. You might be required to try metformin or another diabetes medication before your plan covers semaglutide, even if your doctor believes semaglutide is the right choice for you from the start.

Which weight loss drugs Medicare Part D plans typically cover

Semaglutide (Ozempic for diabetes, Wegovy for weight loss) is the most commonly discussed weight loss drug. Medicare Part D plans vary widely in their coverage. Some cover both versions; some cover only Ozempic (the diabetes version); some cover neither. You cannot know your plan's position without asking.

Tirzepatide (Zepbound for weight loss, Mounjaro for diabetes) follows a similar pattern. Plans that cover it usually cover the diabetes version more readily than the weight loss version. Phentermine, an older stimulant medication, is covered by most Medicare Part D plans because it is inexpensive and has been used for decades, though it is typically prescribed for short-term use only.

Orlistat (Xenical, Alli) is available over the counter at lower doses and by prescription at higher doses. The prescription version may be covered by some plans, but the over-the-counter version is not covered by Medicare because it is not a prescription drug.

GLP-1 drugs like liraglutide (Saxenda) and dulaglutide (Trulicity) are covered by some plans when prescribed for weight loss, though coverage is less consistent than for diabetes uses. Naltrexone-bupropion (Contrave) has limited coverage across Medicare Part D plans.

How to find out what your plan covers

The fastest way to learn your coverage is to call your Part D plan's customer service number, which is on your insurance card. Have your doctor's name and the exact name and dose of the medication ready. Tell the representative you want to know whether the drug is on your plan's formulary and whether prior authorization is required.

You can also use your plan's online formulary search tool, usually found on the plan's website under "Drugs" or "Pharmacy." Enter the drug name and it will show you the tier (how much you pay), any restrictions, and whether prior authorization is needed. If the tool says the drug is not covered, that is your answer for that plan.

Your pharmacy can also check coverage for you. When you pick up a prescription, the pharmacy's system will flag coverage issues before you pay. If the drug is not covered, the pharmacy staff can tell you when ready and help you contact your plan or your doctor.

What to do if your plan does not cover the drug your doctor prescribed

If your plan denies coverage, you have several options. The first is to ask your doctor to request a coverage exception (sometimes called an appeal or formulary exception). Your doctor writes to your plan explaining why this specific drug is medically necessary for you and why alternatives will not work. The plan's medical director reviews the request and decides whether to approve coverage.

Coverage exceptions are approved more often when your doctor can document that you have tried other drugs first and they did not work, or that you have a medical reason why an alternative drug is unsafe for you. If your plan covers semaglutide for diabetes but not for weight loss, and your doctor can show that you have both conditions, that strengthens the case for an exception.

If the exception is denied, you can file a formal appeal with your plan. This is a longer process, but you have the right to do it. You can also switch to a different Medicare Part D plan during the annual open enrollment period (October 15 to December 7 each year) if your current plan's coverage does not meet your needs.

Another option is to pay out of pocket. Some people choose to do this if the drug is expensive but their plan will not cover it. Ask your pharmacy for the cash price before deciding; some weight loss drugs cost several hundred dollars per month without insurance.

Medicare Part B coverage for weight loss services

Medicare Part B (medical insurance) covers some weight loss services that are separate from medications. Part B covers a behavioral therapy program for obesity if your doctor refers you and you meet certain criteria. This is not a drug, but rather counseling sessions with a doctor or other health professional focused on changing eating and exercise habits.

Part B covers up to 14 sessions in the first year if your body mass index (BMI) is 30 or higher, or 22 or higher if you are Asian. The sessions must be in person or by telehealth, and your doctor must refer you. You pay 20 percent of the cost after you meet your Part B deductible.

This behavioral therapy is sometimes covered alongside medication, and sometimes instead of it. If your plan will not cover a weight loss drug, your doctor might refer you to behavioral therapy as an alternative that Medicare will pay for.

Cost and out-of-pocket expenses

If your Part D plan covers a weight loss drug, your out-of-pocket cost depends on which tier the drug is on. Most weight loss medications are on higher tiers (tier 3 or 4), which means you pay more than you would for a generic drug. Your copay or coinsurance for a tier 3 drug might be $35 to $75 per month; a tier 4 drug might be $75 to $150 or more, depending on your plan.

Once you reach your plan's out-of-pocket maximum (usually between $6,000 and $7,000 per year), Medicare covers 95 percent of remaining drug costs for the rest of the year. If you take an expensive weight loss drug all year, you may reach this maximum.

If you cannot afford the copay, ask your doctor or pharmacist whether the drug manufacturer offers a patient information program. Many pharmaceutical companies provide free or reduced-cost medication to people who meet income requirements, even if they have insurance.

Frequently Asked Questions

Does Medicare cover Ozempic or Wegovy for weight loss?

It depends on your plan. Some Medicare Part D plans cover semaglutide (Ozempic or Wegovy) for weight loss; others cover it only when prescribed for diabetes; some do not cover it at all. You must contact your specific plan to find out. If your plan covers it, you may still need prior authorization from your plan before filling the prescription.

What if I switch from Original Medicare to a Medicare Advantage plan?

Medicare Advantage plans (Part C) include prescription drug coverage as part of the plan. Each Advantage plan has its own formulary and coverage rules for weight loss drugs, which may be different from Part D plans. If you switch plans, you need to check the new plan's formulary to see whether your weight loss drug is covered.

Can my doctor appeal if Medicare denies coverage?

Yes. Your doctor can request a coverage exception by writing to your plan and explaining why the drug is medically necessary for you. The plan's medical director will review the request. If the exception is denied, you have the right to file a formal appeal, though this process takes time.

Will Medicare cover weight loss drugs in the future?

Medicare's coverage of weight loss drugs continues to change as new drugs are approved and as plans update their formularies. Coverage rules may expand or contract depending on cost and clinical evidence. Check with your plan each year during open enrollment to see whether coverage has changed.

What is the difference between a copay and coinsurance for weight loss drugs?

A copay is a fixed dollar amount you pay each time you fill a prescription (for example, $50). Coinsurance is a percentage of the drug's cost that you pay (for example, 25 percent). Your plan documents will tell you which applies to your specific drug and tier.