Medicare does not cover Zepbound, but it may cover a similar medication called Mounjaro

Zepbound is a brand name for semaglutide made by Eli Lilly and approved by the FDA for weight loss. Medicare Part D (prescription drug coverage) does not cover Zepbound. However, Medicare Part D does cover Mounjaro, which is also made by Eli Lilly and contains the active ingredient tirzepatide. Mounjaro is approved for type 2 diabetes and works similarly to Zepbound, though it is prescribed for a different purpose.

The reason for the difference matters: Medicare can cover medications for diabetes management, but it does not cover medications prescribed solely for weight loss, even if the same drug company makes both versions. If your doctor prescribes Mounjaro for your type 2 diabetes, your Part D plan may cover it. If your doctor prescribes Zepbound for weight loss alone, Medicare will not pay for it.

Your out-of-pocket cost for either medication depends on your specific Part D plan, your deductible, and which tier (cost level) your plan places the drug on. Some plans charge a copay; others use coinsurance. You can check your plan's formulary — the official list of covered drugs — on your Medicare.gov account or by calling your plan directly.

Key Takeaways

  • Medicare Part D does not cover Zepbound when prescribed for weight loss, but it may cover Mounjaro when prescribed for type 2 diabetes.
  • Both medications contain similar active ingredients and work in comparable ways, but Medicare's coverage rules depend on the medical reason for the prescription.
  • Your out-of-pocket cost for Mounjaro varies by your Part D plan, deductible status, and the tier your plan assigns to the drug.
  • You can view your plan's formulary through Medicare.gov or by calling your plan's customer service number to confirm coverage before filling a prescription.

How Medicare Part D decides what it covers

Medicare Part D plans are run by private insurance companies, and each plan creates its own formulary — a list of drugs it will and will not cover. The formulary is organized by tier, usually ranging from tier 1 (lowest cost to you) to tier 5 (highest cost to you). Where a drug lands on the tier depends on the plan's negotiations with the drug manufacturer and the plan's own cost-management decisions.

For diabetes medications, most Part D plans cover multiple options, including GLP-1 receptor agonists (the drug class that includes both Mounjaro and Zepbound). However, plans do not all cover the same drugs at the same tier. One plan might place Mounjaro on tier 2 with a $35 copay, while another plan places it on tier 3 with a $75 copay or coinsurance.

The key distinction for Zepbound is the indication — the FDA-approved medical reason for the prescription. Zepbound is indicated for chronic weight management in people with obesity or overweight. Medicare Part D plans do not cover medications prescribed for weight loss alone, regardless of the drug's effectiveness or the patient's medical need. This is a coverage policy, not a judgment about whether the medication works.

What Mounjaro costs under Medicare Part D

Mounjaro is a brand-name injectable medication, and brand-name drugs typically land on higher tiers of Part D formularies. Most plans place Mounjaro on tier 3 or tier 4, meaning your copay or coinsurance will be higher than for generic or lower-tier drugs.

Your actual cost depends on where you are in the Part D benefit year. Early in the year, before you meet your deductible, you may pay the full price or a percentage of it. Once you meet your deductible (which varies by plan but is typically $505 in 2024, though this amount changes yearly), you move into the copay or coinsurance phase. Later in the year, if your total drug costs reach a certain threshold, you may enter the coverage gap (sometimes called the "donut hole"), where you pay a higher percentage until you reach catastrophic coverage.

A single pen of Mounjaro can cost $900 to $1,200 before insurance, depending on the dose and your pharmacy. With Part D coverage, your out-of-pocket cost per pen typically ranges from $50 to $250, but this varies widely by plan and your position in the benefit year. Some pharmaceutical companies offer copay cards that reduce your out-of-pocket cost to $25 per month for may be able to access patients.

How to learn about your Part D plan covers Mounjaro

The fastest way to check is to log into your Medicare.gov account, go to "Prescriptions," and search for Mounjaro by name. The search will show you whether your plan covers it, what tier it is on, and what your copay or coinsurance will be. You can also compare your current plan's coverage with other plans during the annual enrollment period (October 15 to December 7 each year).

If you do not have a Medicare.gov account, you can call your Part D plan's customer service number — it is on the back of your insurance card. Tell them you want to know if Mounjaro is covered, what tier it is on, and what your cost will be. Have your plan name and member ID ready. The representative can also tell you whether there are any prior authorization requirements, meaning your doctor may need to get approval from the plan before the pharmacy can fill the prescription.

If your plan does not cover Mounjaro, or if the cost is too high, ask your doctor whether there are other diabetes medications your plan does cover. Metformin, sulfonylureas, SGLT2 inhibitors, and other GLP-1 agonists may be options, and some may have lower out-of-pocket costs on your plan.

Prior authorization and other coverage hurdles

Some Part D plans require prior authorization for Mounjaro, meaning your doctor must submit a request to the plan and receive approval before the pharmacy can dispense the medication. This is not a denial — it is a verification step. The plan wants to confirm that the prescription is medically necessary and that you have not already tried other, less expensive diabetes medications.

Prior authorization typically takes 24 to 72 hours. Your doctor's office handles the request, so ask them how long they expect it to take and whether they can expedite it if needed. Some plans also require step therapy, meaning you must try and fail a different medication first before the plan will cover Mounjaro. If your plan has a step therapy requirement, your doctor can sometimes request an exception if there is a medical reason you cannot take the other drug.

If your plan denies coverage, you have the right to appeal. Your doctor can submit an appeal on your behalf, explaining why Mounjaro is medically necessary for your specific situation. Appeals can take longer — sometimes several weeks — so it is worth starting the process as soon as you know coverage has been denied.

Zepbound and other weight-loss medications under Medicare

Zepbound is not covered by Medicare Part D because it is prescribed for weight loss, not for diabetes management. The same applies to Wegovy (another brand name for semaglutide) and Saxenda (liraglutide). These medications are effective for weight loss, and many people with type 2 diabetes also have obesity, but Medicare's coverage rules separate the indication for diabetes from the indication for weight loss.

If you are interested in weight-loss medication and you have Medicare, talk to your doctor about whether Mounjaro might be appropriate for your type 2 diabetes. If you do not have type 2 diabetes, Medicare will not cover any GLP-1 agonist for weight loss alone. Some Medigap plans or Medicare Advantage plans may offer different coverage, so it is worth checking your specific plan's details.

Outside of Medicare, Zepbound and Wegovy are available through private insurance, employer plans, or out-of-pocket payment. Some pharmaceutical companies offer patient information programs that reduce the cost for uninsured or underinsured people. If you are interested in exploring those options, ask your doctor or pharmacist for information.

Medicare Advantage plans and Zepbound coverage

Medicare Advantage (Part C) plans are an alternative to Original Medicare plus Part D. These plans are run by private insurance companies and include prescription drug coverage as part of the plan. Some Medicare Advantage plans may have different formularies than Part D plans, meaning they might cover different drugs or place them on different tiers.

A small number of Medicare Advantage plans have begun covering Zepbound for weight loss in specific circumstances, particularly for people with obesity and related health conditions like type 2 diabetes or heart disease. However, this is not standard across all plans, and coverage is limited. If you are enrolled in a Medicare Advantage plan and you are interested in Zepbound, contact your plan directly to ask whether it is covered and under what conditions.

If you are considering switching to a Medicare Advantage plan specifically for Zepbound coverage, remember that these plans have different networks, deductibles, and out-of-pocket maximums than Original Medicare. You can compare plans during the annual enrollment period using the Medicare Plan Finder tool on Medicare.gov.

Frequently Asked Questions

Can my doctor prescribe Mounjaro for weight loss instead of diabetes?

Your doctor can prescribe Mounjaro for any medical reason they believe is appropriate, but Medicare Part D will only cover it when it is prescribed for type 2 diabetes. If your doctor prescribes it for weight loss alone, your Part D plan will likely deny the claim. Talk to your doctor about whether Mounjaro is appropriate for your diabetes management.

What if I have both type 2 diabetes and obesity — will Medicare cover Zepbound?

No. Medicare Part D does not cover Zepbound regardless of your other health conditions. If you have type 2 diabetes, your doctor may prescribe Mounjaro, which Medicare may cover. If you want a medication specifically for weight loss, you would need to pay out of pocket or explore other insurance options.

How much does Zepbound cost without insurance?

Zepbound costs approximately $900 to $1,200 per month at retail pharmacies without insurance. Some people use copay cards or patient information programs to reduce this cost. Ask your doctor or pharmacist about programs that might help lower the price.

Can I switch from Zepbound to Mounjaro to get Medicare coverage?

If you are currently taking Zepbound and you have type 2 diabetes, your doctor may be able to switch you to Mounjaro, which Medicare Part D may cover. However, this is a medical decision between you and your doctor, not a coverage workaround. Mounjaro and Zepbound are different medications with different dosing schedules, so the switch requires your doctor's guidance.

What happens if my Part D plan stops covering Mounjaro?

Part D formularies can change from year to year. If your plan removes Mounjaro from its formulary or moves it to a higher tier, you can switch to a different Part D plan during the annual enrollment period (October 15 to December 7). You can also ask your doctor whether there are other diabetes medications your plan does cover that might work for you.