Medicare's Coverage of Weight Loss Shots

Medicare Part D (prescription drug coverage) covers some weight loss shots, but not all of them, and coverage rules differ between plans. The most common weight loss shots — semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro) — are covered by many Part D plans, though your specific plan may require prior authorization or place the drug on a higher cost tier. Medicare Part B does not cover weight loss shots as a standalone treatment; they are only covered through a Part D prescription drug plan.

Coverage depends on three things: whether your plan includes the drug on its formulary (the list of covered medications), what tier it is placed on, and whether your doctor's prescription meets the plan's medical necessity rules. Some plans cover these drugs only for people with type 2 diabetes, while others cover them for weight loss alone. You need to check your specific plan's formulary to know what you will pay.

Key Takeaways

  • Weight loss shots like semaglutide and tirzepatide are covered by many Medicare Part D plans, but coverage varies by plan and may require prior authorization from your doctor.
  • Your out-of-pocket cost depends on which tier your plan places the drug on — typically $0 to $500+ per month depending on your plan and whether you have met your deductible.
  • Some plans cover these drugs only for diabetes treatment, not for weight loss alone, so you must check your plan's formulary before assuming coverage.
  • If your plan does not cover the drug or charges too much, you can switch to a different Part D plan during the annual enrollment period (October 15 to December 7).
  • Medicare does not cover the cost of doctor visits, lab work, or monitoring that may be needed while taking weight loss shots — those are covered under Part B with your regular copay or coinsurance.

How to Check What Your Plan Covers

Start by finding your plan's formulary on Medicare.gov or by calling the phone number on your insurance card. The formulary lists every drug your plan covers and what tier it is on. Search for the specific drug name your doctor recommended — for example, "semaglutide" or "Wegovy" — and note the tier number.

Each tier has a different cost structure. Tier 1 (generic drugs) is cheapest. Tier 2 (preferred brand-name drugs) costs more. Tier 3 and higher (non-preferred drugs) cost the most. Weight loss shots often land on Tier 3 or higher because they are expensive brand-name drugs. Once you know the tier, your plan documents will show what you pay — usually a copay for generic or Tier 1 drugs, and coinsurance (a percentage of the cost) for higher tiers.

If the drug is not on the formulary at all, your plan does not cover it. In that case, you have two options: pay out of pocket (these shots cost $900 to $1,500 per month without insurance), or switch to a different Part D plan during open enrollment that does cover it.

Prior Authorization and Medical Necessity Requirements

Even if your plan covers the drug, your doctor may need to get prior authorization before the pharmacy will fill the prescription. Prior authorization means your doctor submits paperwork to the insurance company proving the drug is medically necessary for you. This usually takes a few days to a week.

Some plans require prior authorization for all weight loss shots. Others only require it if you are using the drug for weight loss rather than diabetes. A few plans require your doctor to document that you have tried other weight loss methods first, or that you meet certain weight or BMI thresholds. Your doctor's office handles this paperwork, but you should ask them upfront whether your plan requires it so there are no surprises at the pharmacy.

What You Will Pay Out of Pocket

Your cost depends on your plan's tier structure and whether you have met your deductible. If weight loss shots are on Tier 3 or higher, you typically pay coinsurance — a percentage of the drug's cost — rather than a flat copay. For a drug that costs $1,200 per month, 20% coinsurance means you pay $240 per month.

Once you have paid a certain amount out of pocket in a calendar year, you enter the "catastrophic coverage" phase, where Medicare pays most of the cost and you pay a small copay. The exact threshold varies by year and plan, but in 2024 it is around $7,050 in out-of-pocket costs. After that point, your copay drops significantly.

Keep in mind that the cost of the shot itself is only part of the picture. Doctor visits to monitor your progress, blood work, and any side effect management are covered under Medicare Part B with your regular copay or coinsurance — usually $15 to $50 per visit depending on your plan.

Switching Plans if Your Current Plan Does Not Cover the Drug

If your current Part D plan does not cover the weight loss shot your doctor recommended, or if the cost is too high, you can switch to a different plan. The annual enrollment period runs from October 15 to December 7 each year, and any new plan you choose takes effect January 1.

Use the Medicare Plan Finder tool on Medicare.gov to compare plans side by side. Enter the specific drug name and dosage your doctor prescribed, and the tool will show you which plans cover it, what tier it is on, and what your estimated cost will be. You can also call 1-800-MEDICARE to speak with someone who can help you compare plans.

If you are in a Special Enrollment Period — for example, because you moved, lost other coverage, or your plan is leaving Medicare — you may be able to switch outside the annual enrollment period. Check Medicare.gov or call 1-800-MEDICARE to see if you may have access to.

Weight Loss Shots Not Covered by Medicare

Some weight loss medications and shots are not covered by any Medicare Part D plan. These include older drugs like phentermine (an appetite suppressant taken by mouth) and some compounded versions of semaglutide made by compounding pharmacies rather than the original manufacturer. If your doctor prescribes one of these, you will pay the full cost out of pocket unless you have other insurance.

Compounded semaglutide is sometimes cheaper than the brand-name versions, but Medicare does not cover it because it is not FDA-approved in that form. If cost is a barrier, talk to your doctor about whether a covered version might work for you, or ask about patient information programs run by the drug manufacturers — these sometimes reduce the cost for people with limited income.

What Happens if You Cannot Afford the Cost

If your plan's cost for the weight loss shot is too high, contact the drug manufacturer directly. Novo Nordisk (which makes Ozempic and Wegovy) and Eli Lilly (which makes Mounjaro and Zepbound) both run patient information programs that may reduce your cost if your income is below a certain threshold. You can also ask your doctor's office for samples or information about these programs.

Some community health centers and federally may have access to health centers (FQHCs) offer weight loss programs at reduced cost based on income. You can find one near you by searching the HRSA Find a Health Center tool on findahealthcenter.hrsa.gov.

Frequently Asked Questions

Does Medicare Part B cover weight loss shots?

No. Medicare Part B covers doctor visits and lab work related to weight loss treatment, but the shots themselves are only covered through Part D (prescription drug coverage). Part B would cover the office visit where your doctor prescribes the shot, but not the shot itself.

Will my plan cover the shot if I use it for diabetes instead of weight loss?

Possibly. Some plans that do not cover weight loss shots will cover semaglutide or tirzepatide if you have type 2 diabetes, because these drugs are FDA-approved for diabetes treatment. Check your plan's formulary or call your plan to ask whether coverage differs based on the reason your doctor is prescribing it.

What if my doctor says the drug is medically necessary but my plan denies prior authorization?

You have the right to appeal the denial. Your doctor can submit additional medical records or a letter explaining why the drug is necessary for your specific situation. The appeal process usually takes 30 to 60 days. You can also file a complaint with your state's insurance commissioner if you believe the denial was unfair.

Can I use a GoodRx coupon or discount card instead of my Medicare coverage?

No. Once you are enrolled in Medicare Part D, you must use your Part D coverage for prescription drugs — you cannot use discount cards or coupons instead. Using a discount card could affect your coverage and cost calculations for the year. Always use your Medicare card at the pharmacy.

Do I have to pay for the shot upfront and get reimbursed later?

No. When you fill the prescription at the pharmacy, you pay your copay or coinsurance amount at that time, and Medicare pays the rest directly to the pharmacy. You do not pay the full price and wait for reimbursement.