Medicare's coverage of weight loss injections depends on the specific drug and your reason for using it

Medicare Part B covers two weight loss injections: semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro) — but only under certain conditions. The drug must be prescribed for type 2 diabetes or, in some cases, for weight loss in people with obesity and related health conditions. Medicare will not cover these injections if your doctor prescribes them solely for weight loss without a may have access to medical reason. Coverage also varies depending on whether you have Original Medicare (Part A and B) or a Medicare Advantage plan, and your specific plan's formulary — the list of drugs it covers.

The cost difference matters. If Medicare covers the injection, you typically pay 20 percent of the cost after you meet your Part B deductible. If it does not cover it, you pay the full price, which can be $900 to $1,500 per month depending on the dose and pharmacy. Some people find that the same drug costs less when prescribed for diabetes than when prescribed for weight loss, because Medicare's rules differ between the two uses.

Key Takeaways

  • Medicare Part B covers semaglutide and tirzepatide when prescribed for type 2 diabetes, and may cover them for weight loss if you have obesity plus related conditions like heart disease or high blood pressure.
  • Your Medicare Advantage plan may have different rules than Original Medicare, so you need to check your plan's formulary or call the plan directly.
  • If Medicare covers the injection, you pay 20 percent after your Part B deductible; if it does not, you pay the full retail price.
  • Your doctor must document the medical reason for the prescription, and Medicare may require prior authorization before the pharmacy fills it.

When Medicare Part B covers weight loss injections

Medicare Part B covers semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro) when a doctor prescribes them for type 2 diabetes management. This is straightforward — if you have diabetes and your doctor thinks the injection will help control your blood sugar, Medicare will typically cover it after you meet your deductible and pay your 20 percent coinsurance.

For weight loss without diabetes, coverage is narrower. Medicare may cover these injections if you have obesity (a BMI of 30 or higher, or 27 or higher with weight-related health conditions) and you also have a related condition such as heart disease, high blood pressure, or sleep apnea. Your doctor must document both the obesity and the related condition in your medical record. Even then, your specific Medicare Advantage plan may not cover it, or may require prior authorization — approval from the plan before you start the drug.

Original Medicare (Part A and B) and Medicare Advantage plans do not always follow the same rules. Some Advantage plans cover weight loss injections more broadly; others cover them only for diabetes. You cannot assume that because Original Medicare covers something, your Advantage plan will too.

How to find out what your plan covers

The fastest way to know whether your plan covers a weight loss injection is to call the plan directly. Have your doctor's name and the specific drug name (semaglutide, tirzepatide, or the brand name) ready. Ask whether the plan covers it for your specific reason — diabetes, weight loss, or both — and whether prior authorization is required.

If you have Original Medicare, call Medicare at 1-800-MEDICARE (1-800-633-4227). They can tell you whether Part B covers the drug and what your out-of-pocket cost will be. If you have a Medicare Advantage plan, the phone number is on your insurance card.

You can also ask your pharmacy to check coverage before your doctor writes the prescription. Pharmacies can run a coverage check in their system and tell you whether the drug is covered and what you will owe. This takes a few minutes and saves you from finding out at the register that the drug is not covered.

Prior authorization and what it means for your timeline

Prior authorization is approval from your insurance plan before you fill the prescription. Your doctor's office usually handles this — they submit paperwork to Medicare or your Advantage plan explaining why you need the drug, and the plan decides whether to approve it. This process typically takes three to five business days, though it can be faster or slower depending on the plan.

If your plan requires prior authorization and your doctor's office does not submit it, the pharmacy will not fill the prescription. If you are ready to start the injection and prior authorization is required, ask your doctor's office to submit it as soon as the prescription is written. Do not wait until you are at the pharmacy.

Some plans approve the drug for a limited time — for example, three months — and then require another authorization if you want to keep taking it. Ask your plan how often you will need to renew authorization.

What you pay if Medicare covers it

If Medicare covers the injection, your cost depends on whether you have Original Medicare or a Medicare Advantage plan. With Original Medicare Part B, you pay 20 percent of the approved amount after you meet your annual Part B deductible (which is $240 in 2024, though this changes yearly). The actual cost varies by pharmacy and dose, but 20 percent of a typical monthly supply is roughly $150 to $300.

Medicare Advantage plans set their own copays and coinsurance. Some plans charge a flat copay per injection (for example, $50 per month); others charge a percentage of the cost. Check your plan documents or call the plan to find out your specific cost.

If you reach your out-of-pocket maximum during the year, you pay nothing for the injection for the rest of that calendar year. This maximum varies by plan and year.

What you pay if Medicare does not cover it

If Medicare does not cover the injection — either because you do not meet the medical criteria or because your Advantage plan excludes it — you pay the full retail price. Semaglutide (Wegovy) costs roughly $900 to $1,500 per month depending on the dose. Tirzepatide (Zepbound) is similar. Some pharmacies offer discount programs or coupons that can lower the price, but these are not the same as insurance coverage.

If cost is a barrier, ask your doctor whether there are other weight loss medications that Medicare does cover, or whether your situation might meet Medicare's criteria for coverage. Sometimes a small change in how the medical reason is documented can affect whether Medicare will pay.

Medicare Advantage plans and weight loss injections

Medicare Advantage plans (also called Part C) are run by private insurance companies under contract with Medicare. Each plan decides which drugs to cover and at what cost. One Advantage plan may cover semaglutide for weight loss, while another covers it only for diabetes, and a third does not cover it at all.

If you are thinking about switching to a different Advantage plan or are choosing a plan for the first time, check whether the plan covers the weight loss injection you want. This information is in the plan's formulary, which you can find on the plan's website or by calling the plan. If the drug is not listed, call and ask directly — sometimes drugs are covered but not listed in the online formulary.

If your current Advantage plan does not cover a weight loss injection your doctor recommends, you can switch to a different plan during the Annual Enrollment Period (October 15 to December 7 each year). You can also appeal your plan's decision not to cover the drug, though appeals can take weeks.

Questions to ask your doctor and Medicare

Before your doctor prescribes a weight loss injection, ask whether Medicare is likely to cover it based on your health conditions. Ask your doctor to document the medical reason clearly in your chart — this matters for prior authorization. If your doctor is prescribing it for weight loss, ask what related health conditions Medicare will recognize as a reason to cover it.

Ask your doctor's office to check with your insurance plan before writing the prescription. This takes a phone call and can save you from discovering at the pharmacy that the drug is not covered or requires prior authorization.

If your plan denies coverage, ask your doctor whether they can appeal the decision or resubmit with additional medical information. Some denials are reversed on appeal.

Frequently Asked Questions

Does Medicare cover Ozempic for weight loss?

Medicare covers Ozempic (semaglutide) when prescribed for type 2 diabetes. For weight loss alone, Medicare may cover it only if you have obesity plus a related condition like heart disease or high blood pressure. Your specific Medicare Advantage plan may have different rules.

What is the difference between Ozempic and Wegovy?

Ozempic and Wegovy are both semaglutide, but Ozempic is approved and marketed for diabetes, while Wegovy is approved for weight loss. Medicare is more likely to cover Ozempic when prescribed for diabetes. If your doctor prescribes Wegovy for weight loss, Medicare coverage depends on whether you meet the criteria for weight loss coverage.

Can I appeal if Medicare denies coverage?

Yes. If Original Medicare denies coverage, you can file an appeal. If a Medicare Advantage plan denies it, you can appeal to the plan. Your doctor's office can help with the appeal by providing additional medical information. Appeals can take several weeks.

Will my out-of-pocket costs change if I switch from Ozempic to Wegovy?

Possibly. If Medicare covers Ozempic for your diabetes but not Wegovy for weight loss, your cost will jump from 20 percent coinsurance to the full retail price. Ask your doctor and your insurance plan about the cost difference before switching.

What if my Medicare Advantage plan covers the injection but my doctor is not in the plan's network?

You can still see the doctor and get the prescription, but you may pay more. Out-of-network care in Medicare Advantage plans is usually more expensive than in-network care. Check your plan's rules about out-of-network prescriptions before you see the doctor.