Medicare's Coverage of Weight Loss: The Basic Rules

Medicare covers weight loss treatment only when a doctor diagnoses obesity as a medical condition and prescribes treatment as part of your care plan. Medicare does not cover weight loss programs, gym memberships, diet plans, or weight loss drugs taken solely for appearance or lifestyle reasons. The coverage depends on which part of Medicare you have, what your doctor orders, and whether the treatment meets Medicare's medical necessity standard.

Original Medicare (Part A and Part B) covers some weight loss services, but the scope is narrow. Medicare Advantage plans (Part C) may offer additional coverage, including some preventive weight loss programs that Original Medicare does not. You need to know which services your specific plan covers before you pay out of pocket.

Key Takeaways

  • Medicare covers weight loss drugs like semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound) only when prescribed by a doctor for obesity as a medical condition, not for cosmetic weight loss.
  • Original Medicare Part B covers bariatric surgery when medically necessary, but you pay 20 percent of the cost after meeting your deductible, and the surgery must be performed at a Medicare-approved facility.
  • Medicare does not cover commercial weight loss programs, gym memberships, nutritionist visits, or behavioral counseling for weight loss unless your doctor orders them as part of treatment for a related condition like diabetes.
  • Medicare Advantage plans sometimes cover preventive weight loss programs and counseling that Original Medicare does not, so you should check your plan's summary of coverage before assuming you have no coverage.
  • Your doctor must document that weight loss is medically necessary to treat or prevent a condition like heart disease, diabetes, or sleep apnea for Medicare to consider paying.

Weight Loss Drugs: What Medicare Pays For

Medicare Part B covers weight loss medications when your doctor prescribes them to treat obesity as a medical condition. The most common drugs are semaglutide (brand names Ozempic and Wegovy) and tirzepatide (brand name Zepbound). Your doctor must document that you have obesity and that the drug is medically necessary — meaning it is being used to prevent or treat a related health problem, not for appearance alone.

You pay 20 percent of the Medicare-approved amount after you meet your Part B deductible. The actual out-of-pocket cost depends on the drug, the dose, and what your pharmacy charges. Some pharmacies offer copay cards or manufacturer discounts that can lower your cost, but these work differently depending on whether you have Original Medicare or a Medicare Advantage plan. Call your pharmacy and your plan before filling the prescription to find out your exact cost.

Medicare Part D (prescription drug coverage) may also cover weight loss drugs, depending on your plan's formulary — the list of drugs the plan covers. Some Part D plans cover semaglutide and tirzepatide; others do not. If your Part B does not cover the drug or if your out-of-pocket cost is high, ask your doctor whether a Part D plan might cover it instead. You cannot use both Part B and Part D for the same drug at the same time, so you need to know which one your plan uses.

Bariatric Surgery Coverage and Costs

Medicare Part B covers bariatric surgery (weight loss surgery) when your doctor determines it is medically necessary. This usually means you have a body mass index (BMI) of 35 or higher with a related health condition, or a BMI of 40 or higher regardless of other conditions. Your doctor must document the medical reason for the surgery and confirm that you have tried other weight loss methods first.

The surgery must be performed at a Medicare-approved facility by a surgeon who accepts Medicare. You pay 20 percent of the Medicare-approved cost after you meet your Part B deductible. The total out-of-pocket cost varies widely depending on the type of surgery, the facility, and your deductible status. Gastric bypass, gastric banding, and sleeve gastrectomy are the most common procedures Medicare covers. Before scheduling surgery, ask the surgeon's office to submit a request to Medicare for prior authorization — this confirms in advance whether Medicare will pay.

Medicare Advantage plans may have different rules for bariatric surgery, including higher BMI thresholds or additional requirements. Check your plan's coverage details or call the plan before you schedule a consultation with a surgeon.

Preventive Counseling and Behavioral Programs

Original Medicare Part B covers one preventive visit per year with your primary care doctor to screen for obesity and discuss weight loss. This visit is free (no copay or coinsurance) and is meant to identify whether weight loss would help prevent disease. However, this visit does not include a full weight loss program or ongoing counseling sessions.

If your doctor refers you for behavioral counseling or nutritionist visits as treatment for a related condition — such as diabetes management or heart disease prevention — Medicare may cover those services under Part B. You would pay 20 percent of the cost after your deductible. The key is that the counseling must be ordered by your doctor as part of treating a specific medical condition, not as a standalone weight loss program.

Medicare Advantage plans often cover more preventive services than Original Medicare, and some include weight loss counseling, nutritionist visits, or gym memberships as part of their wellness benefits. These vary by plan and by region. If you have a Medicare Advantage plan, review your plan's summary of coverage or call the plan to ask whether weight loss counseling or programs are included.

What Medicare Does Not Cover

Medicare does not cover commercial weight loss programs like Weight Watchers, Noom, Jenny Craig, or similar services, even if your doctor recommends them. You pay the full cost yourself. Medicare also does not cover gym memberships, fitness classes, or personal training, even if a doctor says exercise would help you lose weight.

Nutritionist or dietitian visits are not covered by Original Medicare unless your doctor orders them as part of treatment for diabetes, kidney disease, or another specific medical condition. Even then, coverage is limited. Over-the-counter weight loss supplements, meal replacement shakes, and diet books are never covered.

If you have a Medicare Advantage plan, some of these services may be covered as part of your plan's wellness or preventive benefits. The only way to know is to check your plan documents or call the plan directly.

How to Find Out What Your Plan Covers

The fastest way to learn what your plan covers for weight loss is to call the customer service number on the back of your Medicare card. Have your plan name and member ID ready. Ask specifically: "Does my plan cover weight loss drugs?" "Does my plan cover bariatric surgery?" and "Does my plan cover weight loss counseling or programs?" Write down the answers and ask for a reference number in case you need to follow up.

You can also review your plan's summary of coverage online. For Original Medicare, visit Medicare.gov and search for "obesity coverage." For Medicare Advantage, log into your plan's website or request a printed copy of your plan's coverage details. If you are considering a specific drug or surgery, ask your doctor's office to contact your plan for a coverage information before you proceed.

If your plan denies coverage for a service your doctor ordered, you have the right to request a reconsideration. Your doctor can submit additional documentation explaining why the service is medically necessary. This process is called an appeal, and your plan must respond within a set timeframe.

Frequently Asked Questions

Does Medicare cover Ozempic or Wegovy for weight loss?

Medicare Part B covers semaglutide (Ozempic and Wegovy) when your doctor prescribes it to treat obesity as a medical condition. You pay 20 percent of the cost after your deductible. Some Medicare Advantage or Part D plans may also cover it. Call your plan to confirm coverage before filling the prescription.

Will Medicare pay for weight loss surgery if I have not tried diet and exercise first?

No. Medicare requires documentation that you have attempted other weight loss methods before approving bariatric surgery. Your doctor must include this in the medical record submitted for prior authorization. The specific requirements vary, so ask your surgeon's office what Medicare will need to see.

Does Medicare cover Weight Watchers or other commercial diet programs?

No. Medicare does not cover commercial weight loss programs, gym memberships, or fitness classes. You pay the full cost yourself. Some Medicare Advantage plans may offer gym discounts or wellness programs, so check your plan's benefits.

Can I use both Medicare Part B and Part D to pay for weight loss drugs?

No. A drug is covered by either Part B or Part D, not both. If your Part B cost is high, ask your doctor whether switching to a Part D plan might lower your out-of-pocket cost. You can change Part D plans during the annual enrollment period.

What if my doctor says weight loss is medically necessary but Medicare denies coverage?

You can request an appeal. Your doctor can submit additional medical records and documentation explaining why the treatment is necessary. Your plan must respond to the appeal within a set timeframe. If you disagree with the appeal decision, you can request an independent review through Medicare.