Does Medicare Cover Mounjaro? What You Need to Know in 2026

TL;DR

• Medicare Part D may cover Mounjaro for type 2 diabetes if it is on your plan's formulary, but it will not cover it for weight loss alone.
• Out-of-pocket costs vary by plan, but2026 Medicare Part D annual cap limits your total drug spending to $2,100 maximum.
• The CMS BALANCE demonstration program, announced in late 2025, may expand limited GLP-1 coverage for obesity to about 10% of Medicare beneficiaries starting mid-2026, but details are still pending.

What Does Medicare Part D Cover?

Medicare Part D isprescription drug benefit. Each Part D plan maintains its own formulary, which islist of medications it covers. Mounjaro is classified as a brand-name, specialty-tier medication on most formularies.

For Mounjaro to be covered, your prescriber needs to document thatmedication is being used for its FDA-approved indication: improving blood sugar control in adults with type 2 diabetes, alongside diet and exercise. Ifprescription is written for weight loss,claim will be denied.

Even with a diabetes diagnosis, your plan may require prior authorization. This means your doctor needs to submit documentation showing that Mounjaro is medically necessary for your condition. Some plans also use step therapy, which requires you to try and fail on a less expensive medication (like metformin or another GLP-1 such as Ozempic) before they will approve Mounjaro. Others may have quantity limits that capamount dispensed per month.

If Mounjaro is not on your specific plan's formulary, you or your doctor can request a formulary exception. This involves your doctor writing a letter explaining why Mounjaro is medically necessary for you specifically. Plans do not always approve these requests, but it is worth trying.

How Much Does Mounjaro Cost with Medicare?

The list price for a one-month supply of Mounjaro (four injection pens) is approximately $1,069 to $1,100 as of 2026, depending ondose. Without insurance, retail pharmacy prices range from about $1,000 to $1,300 per month.

With Medicare Part D coverage for type 2 diabetes, your costs will depend on your plan's deductible, coinsurance structure, andtier Mounjaro falls on.

Most plans have a deductible of up to $615 in 2026. You pay full price for covered drugs until you meet this amount. Afterdeductible, you typically pay 25% coinsurance until you reachannual out-of-pocket maximum. In 2026, Medicare Part D caps your total annual out-of-pocket drug costs at $2,100 across all covered medications. This cap includes your deductible and copays/coinsurance but does not include your monthly plan premium.

This means that even if Mounjaro is expensive on a per-month basis, your total annual spending on all Part D medications combined will not exceed $2,100. For many beneficiaries taking Mounjaro, this cap will be reached withinfirst few months ofyear, after which your plan coversremaining cost forrest ofyear.

In 2023, Medicare spent over $2 billion covering Mounjaro for approximately 370,000 beneficiaries, averaging roughly $6,379 per beneficiary per year. That gives you a sense ofscale of cost involved and why Medicare plans require documentation before approving coverage.

Does Medicare Cover Mounjaro for Weight Loss?

No. Current federal law prohibits Medicare from covering drugs prescribed solely for weight loss. This exclusion has been in place for decades and applies to all anti-obesity medications, not just Mounjaro.

However,landscape is shifting. In late 2025,Centers for Medicare and Medicaid Services (CMS) announcedBALANCE Model (Better Approaches to Lifestyle and Nutrition for Comprehensive Health), which includes a Medicare GLP-1 payment demonstration scheduled to begin in July 2026. Under this model, a limited number of Medicare beneficiaries, estimated at roughly 10% oftotal population, may gain access to GLP-1 medications for obesity.

CMS has not yet released full details on eligibility criteria, enrollment processes, or which specific medications will be included. As of early 2026,standard coverage rules still apply, and GLP-1 medications for weight loss remain excluded from Part D coverage.

If you are interested in howMounjaro savings card works for people not on Medicare, this guide coversdetails: Mounjaro Savings Card

Can You Use Manufacturer Savings Cards with Medicare?

No. Eli Lilly offers a Mounjaro savings card that can reducecost to as little as $25 per prescription for eligible commercial insurance patients. However, federal law prohibitsuse of manufacturer copay cards and savings programs by anyone enrolled in Medicare Part D, Medicaid, or other government-funded insurance programs. This restriction applies regardless of whether your Part D plan covers Mounjaro or not.

Eli Lilly also has a patient assistance program called Lilly Cares. As of early 2026, Mounjaro is not included in this program, but it is worth monitoring for future changes.

What If Your Medicare Plan Does Not Cover Mounjaro?

If your current Part D plan does not cover Mounjaro, or ifout-of-pocket costs are too high, you have several options.

You can switch plans duringMedicare Annual Enrollment Period (October 15 through December 7 each year). UseMedicare Plan Finder tool on Medicare.gov to compare plans in your area. Enter Mounjaro as one of your medications and your preferred pharmacy to see which plans cover it and at what estimated cost.

You can ask aboutExtra Help program (also calledLow-Income Subsidy). If your income and resources fall below certain thresholds, Extra Help can reduce your Part D premiums, deductibles, and coinsurance. You can apply throughSocial Security Administration at 1-800-772-1213 or online.

You can request a 90-day supply instead of a 30-day supply if your plan and pharmacy allow it. Research has shown that 90-day prescriptions can lower per-unit costs and improve medication adherence.

You can also ask your doctor whether an alternative GLP-1 medication on a preferred tier of your plan might work for your diabetes management. Options like Ozempic or Trulicity may be covered at a lower copay depending on your formulary.

What About Zepbound for Weight Loss Under Medicare?

Zepbound (also tirzepatide) is FDA-approved for chronic weight management and for moderate to severe obstructive sleep apnea in adults with obesity. Medicare Part D plans may cover Zepbound for obstructive sleep apnea if it is onformulary, but they still cannot cover it for weight loss alone under current law.

If you have both type 2 diabetes and are interested in weight management, Mounjaro prescribed for diabetes is likely your best path to coverage, since weight loss is a well-documented side effect ofmedication even when prescribed for blood sugar control.

For guidance on timing your Mounjaro injection for best results, this resource covers practical tips: Best Time of Day to Take Mounjaro

Conclusion

Medicare Part D can cover Mounjaro when it is prescribed for type 2 diabetes and listed on your plan's formulary, but it does not cover it for weight loss. You will likely need prior authorization, and your costs depend on your plan's deductible, coinsurance, and tier placement. The 2026 out-of-pocket cap of $2,100 provides meaningful financial protection once reached. The upcoming CMS BALANCE demonstration may expand limited GLP-1 coverage for obesity starting mid-2026, butstandard rules still apply for now. If cost is a barrier, compare plans during open enrollment, apply for Extra Help if you qualify, and talk to your doctor about covered alternatives. Always check your specific plan's formulary and requirements before assuming coverage.