Getting weight loss medication covered by insurance requires meeting specific medical criteria, navigating prior authorization, and knowing how to push back if you’re denied. The process varies significantly depending on whether you have employer-sponsored insurance, a marketplace plan, Medicaid, or Medicare, but the core steps are similar: confirm your plan covers these drugs, document your medical need, and be prepared to appeal.
Check Whether Your Plan Covers Weight Loss Drugs
Before anything else, find out if your insurance plan covers weight loss medications at all. Many plans exclude them entirely, and no amount of paperwork will change that until the exclusion itself is removed. The document you need depends on your plan type. If your employer self-insures (meaning the company pays claims directly rather than buying coverage from an insurer), look for the Summary Plan Description or plan document. If your plan is fully insured, request the Certificate of Coverage or Summary of Benefits from your insurer.
Look for a section labeled something like “Expenses Not Covered” or “Exclusions.” A common exclusion reads: “Weight control services including surgical procedures, medical treatments, weight control/loss programs, medications, and other services primarily intended to control weight or treat obesity.” If you find language like this, your plan likely won’t cover any weight loss medication regardless of your health status. But read carefully. Sometimes the same section includes exceptions or covered benefits that aren’t obvious at first glance. Call your insurer and ask them to highlight the specific exclusion language and mail you a copy.
Self-insured employers have wide latitude to customize what they cover, which is why weight loss drug coverage varies so much from one workplace to another. If your employer excludes these medications, you can advocate for a policy change through HR, sometimes successfully, especially as obesity treatment becomes more mainstream. Fully insured plans tend to follow more standardized benefit packages set by the insurance carrier.
Meet the Medical Eligibility Thresholds
Insurance plans that do cover weight loss medications almost universally require you to meet BMI-based criteria before they’ll pay. The standard thresholds, used by most commercial insurers and state programs, are:
- BMI of 30 or higher with no additional conditions required
- BMI of 27 to 29.9 with at least one weight-related health condition, such as high blood pressure, type 2 diabetes, or high cholesterol
For adolescents aged 12 to 17, some programs require a BMI of 30 or above and a body weight over 132 pounds (60 kg). Most plans also want documentation that you’ve already started or are actively participating in lifestyle changes: a reduced-calorie diet or working with a registered dietitian, plus a physical activity regimen (unless a medical condition makes exercise unsafe).
This is where many people hit their first obstacle. Even if your BMI qualifies, insurers often want proof that you’ve been making lifestyle efforts alongside medication. Ask your doctor to note diet and exercise counseling in your medical records at every visit. These notes become critical evidence later.
Which Medications Are Most Likely to Be Covered
Six medications are FDA-approved for long-term weight management: orlistat (Xenical, Alli), phentermine-topiramate (Qsymia), naltrexone-bupropion (Contrave), liraglutide (Saxenda), semaglutide (Wegovy), and tirzepatide (Zepbound). An additional drug, setmelanotide (Imcivree), is approved only for people with specific rare genetic conditions confirmed by testing.
Insurance formularies don’t treat all of these equally. Older, less expensive options like orlistat and naltrexone-bupropion are more likely to be covered without extensive hurdles. The newer GLP-1 drugs, Wegovy and Zepbound, cost significantly more and almost always require prior authorization. Some insurers will only approve a GLP-1 after you’ve tried and failed a cheaper medication first.
Your doctor may also prescribe medications “off-label,” meaning a drug approved for a different condition is used for weight management. Off-label prescriptions are harder to get covered because insurers can argue the drug isn’t indicated for weight loss. If your doctor believes an off-label option is the right fit, they’ll need to build a strong medical necessity case.
How Prior Authorization Works
Nearly all GLP-1 prescriptions for weight loss require prior authorization, a process where your insurer reviews the prescription before agreeing to pay for it. Your doctor’s office typically handles the submission, but understanding what happens behind the scenes helps you stay on top of it.
When your doctor submits a prior authorization request, a reviewer at the insurance company checks your medical records against the plan’s clinical guidelines. They’re looking for your BMI, documented comorbidities, evidence of lifestyle modifications, and whether you’ve tried other treatments. If everything checks out, the prescription gets approved. If the clinical criteria aren’t met on paper, the request gets escalated to a physician reviewer at the insurance company, who makes a judgment call on medical necessity.
One important detail: even if you don’t meet every checkbox in the clinical guidelines, a physician reviewer can still approve your request if they determine the medication is medically necessary for your situation. This means borderline cases aren’t automatically dead on arrival.
Prescriptions for GLP-1 medications are typically limited to a one-month supply per fill, so expect to go through the pharmacy regularly rather than getting a 90-day supply.
Build a Strong Medical Necessity Case
The single most important thing you can do is work with your doctor to create thorough documentation before the prior authorization is submitted. A Letter of Medical Necessity from your physician should include your specific medical condition and diagnosis, the duration of treatment (for a chronic condition like obesity, this may be noted as ongoing), and a clear statement that the medication is medically necessary rather than for cosmetic or general wellness purposes.
Beyond the letter, your medical chart should contain:
- BMI history over multiple visits, showing a pattern rather than a single measurement
- Weight-related conditions with documented diagnoses (hypertension, sleep apnea, type 2 diabetes, high cholesterol)
- Lifestyle intervention records showing diet counseling, dietitian visits, or exercise programs you’ve participated in
- Previous treatment attempts and their outcomes, especially if you tried other weight loss medications that didn’t work or caused side effects
If your insurer requires step therapy, meaning you must try a lower-cost drug before they’ll approve a more expensive one, make sure your doctor documents why the first medication failed. “Failed” can mean it didn’t produce adequate weight loss, caused intolerable side effects, or was medically contraindicated for you.
What to Do If You’re Denied
A denial isn’t the end. You have the legal right to appeal, and the process has two levels. First is an internal appeal, where you ask the insurance company to conduct a full review of its own decision. If your situation is urgent, the company must expedite this review. Gather any additional documentation your doctor can provide, including updated lab results, specialist letters, or evidence of worsening health conditions related to your weight.
If the internal appeal fails, you can request an external review. This takes your case to an independent third party who is not employed by or affiliated with your insurance company. The external reviewer makes a binding decision, meaning the insurer no longer has the final say. External reviews are particularly worth pursuing when you have strong documentation of medical necessity that you believe was overlooked.
Many people give up after the first denial, which is exactly what insurers count on. Studies of prior authorization denials across all drug categories consistently show that a significant percentage of appeals succeed, especially when additional clinical evidence is submitted.
Medicare, Medicaid, and Government Plans
Medicare has historically not covered weight loss medications under Part D. That’s changing, but slowly. A program called the Medicare GLP-1 Bridge is set to begin in July 2026, providing eligible Medicare beneficiaries access to certain GLP-1 drugs through December 2027. Until that program launches, Medicare Part D does not cover GLP-1 medications prescribed purely for weight loss.
There’s an important exception. If your doctor prescribes Wegovy specifically to reduce cardiovascular risk in someone with established heart disease and obesity, or Zepbound for moderate-to-severe obstructive sleep apnea in adults with obesity, those uses can be covered under the existing Part D benefit. The key distinction is the indication: it’s not being prescribed “for weight loss” on paper, even though weight loss is a secondary benefit.
Medicaid coverage varies dramatically by state. While state Medicaid programs must cover nearly all FDA-approved drugs, a longstanding federal exception allows states to opt out of covering weight loss medications specifically. As of January 2026, only 13 state Medicaid programs cover GLP-1 drugs for obesity treatment. Several states, including California, New Hampshire, Pennsylvania, and South Carolina, recently eliminated coverage due to budget pressures. If you’re on Medicaid, check your state’s current formulary, because this landscape shifts frequently.
Manufacturer Savings Programs
If you have commercial insurance that partially covers your medication but leaves you with a high copay, manufacturer savings cards can help. The Wegovy Savings Offer, for example, can bring your cost down to as little as $25 per month if you have commercial insurance coverage for the drug. The maximum savings are $100 per one-month prescription, $200 per a two-month prescription, or $300 for three months.
For people without insurance coverage for Wegovy, the manufacturer offers introductory pricing: $149 per month for the oral tablet form and $199 per month for the injectable pen at the lowest dose. These prices use the savings offer and vary by dose, so higher maintenance doses will cost more.
These programs come with a significant limitation. You’re not eligible if you’re enrolled in any government-funded healthcare program, including Medicare, Medicaid, Medicare Part D, Medicare Advantage, TRICARE, VA, or any state healthcare program. The savings cards are exclusively for people with commercial (private) insurance.
Zepbound and other brand-name weight loss medications offer similar savings programs with their own terms. Check each manufacturer’s website directly, as eligibility rules and savings amounts change frequently.