Getting insurance to cover weight loss medications like Wegovy or Zepbound requires meeting specific clinical criteria, navigating prior authorization, and sometimes appealing a denial. Only about 14.6% of employer health plans cover Wegovy, and 83% of people with coverage still face restrictions like prior authorization or step therapy. The process is bureaucratic, but it’s winnable if you understand what insurers need to see.
The Clinical Criteria You Need to Meet
Insurance coverage for weight loss drugs follows the FDA-approved indications closely. You generally qualify if you have a BMI of 30 or higher, or a BMI of 27 or higher with at least one weight-related condition such as high blood pressure, type 2 diabetes, high cholesterol, or sleep apnea. Your doctor will need to document your height, weight, the date you were weighed, and your calculated BMI as part of any coverage request.
Beyond BMI, insurers typically ask whether you’re pregnant or nursing, whether you have a history of eating disorders or substance misuse, and whether your prescriber has ruled out medical contraindications. Most plans also require that you’ve participated in a weight loss treatment plan for at least six months before starting medication. That means documented nutritional counseling, an exercise regimen, or a calorie-restricted diet, and a commitment to continue those efforts while on the drug. If you haven’t started this yet, ask your doctor to begin documenting a structured plan now. That six-month clock matters.
How Prior Authorization Works
Almost every insurer requires prior authorization before covering a weight loss medication. This means your doctor’s office submits a formal request proving you meet the plan’s criteria. The paperwork covers your diagnosis, BMI, weight-related conditions, treatment history, and a goal weight. Your doctor also attests that the medication is appropriate for you and that no contraindications exist.
The process typically takes a few days to a few weeks. You can speed things up by making sure your medical records already contain everything the insurer will look for: recent weight measurements, documentation of any weight-related diagnoses, and notes showing you’ve been following a diet or exercise plan. If your doctor’s office is unfamiliar with the prior authorization forms for these drugs, ask them to pull the form from your insurer’s website. Being proactive here saves time.
Step Therapy: The Drugs They May Ask You to Try First
Some plans use step therapy, meaning they require you to try a less expensive weight loss medication before they’ll approve a GLP-1 drug like Wegovy or Zepbound. Older, cheaper options like phentermine are commonly used as a first step. Phentermine is typically approved for only three months at a time and cannot be renewed, while GLP-1 medications like Wegovy are initially approved for six months with the possibility of renewal.
If your plan requires step therapy, the fastest path forward is to complete the required trial. Keep records of how you responded to the initial medication, including whether you lost weight, experienced side effects, or saw no improvement. If the first-step drug doesn’t work or causes problems, that documentation becomes your justification for moving to the next tier.
What Happens at Renewal
Prior authorization for weight loss drugs is usually valid for 6 to 12 months. When that period ends, your insurer will require proof that the medication is working before they continue paying. The most common renewal threshold is a loss of at least 5% of your initial body weight. If you started at 250 pounds, for example, you’d need to show you’ve lost at least 12.5 pounds.
This is worth knowing from day one, because if you don’t hit that target, your coverage could be cut off. Track your weight at regular doctor visits so the documentation is clean when renewal time comes. If you’re close but not quite at 5%, talk to your doctor about adjusting your overall plan before the renewal deadline.
Using the Cardiovascular Indication
Wegovy has a separate FDA approval for reducing the risk of heart attack, stroke, and cardiovascular death in adults who already have established heart disease and are living with obesity or overweight. In clinical trials, serious cardiovascular events occurred in 6.5% of people taking Wegovy compared to 8% on placebo. If you have a history of heart attack, stroke, or other cardiovascular disease, your doctor can prescribe Wegovy specifically for cardiovascular risk reduction rather than weight loss. This distinction matters because some plans that exclude weight loss drugs still cover medications prescribed to reduce heart risk. It changes the billing code and the clinical justification, which can open a door that would otherwise be closed.
Medicare Coverage Starting in 2026
Medicare has historically excluded weight loss drugs from Part D coverage. That’s changing through the Medicare GLP-1 Bridge, a demonstration program running from July 2026 through December 2027. The program will cover Wegovy, Zepbound, and Foundayo for weight reduction, but with stricter BMI requirements than commercial plans use.
To qualify, Medicare beneficiaries will need a BMI of 35 or higher, or a BMI of 30 or higher with certain serious conditions like heart failure, uncontrolled high blood pressure, or stage 3a kidney disease. There’s also a pathway for those with a BMI of 27 or higher who have pre-diabetes, a history of heart attack, previous stroke, or symptomatic peripheral artery disease. If you’re on Medicare and already taking Wegovy for cardiovascular risk reduction, that’s a separate coverage pathway through standard Part D, not the Bridge program.
What to Do When You’re Denied
A denial isn’t the end. You have the right to appeal, and appeals succeed more often than people expect, especially when the paperwork is solid. Start by reading the denial letter carefully. It will cite a specific reason, whether that’s not meeting BMI criteria, missing documentation, or the drug being excluded from your formulary.
Your appeal letter should do four things. First, quote the exact language from the denial and attach the letter. Second, reference your plan’s Evidence of Coverage document to show that medically necessary treatments are a covered benefit and that weight loss medication isn’t expressly excluded. Third, include a letter from your doctor describing your condition, why the medication is necessary, and what’s likely to happen to your health without it. Fourth, attach supporting medical records: your BMI history, documented weight-related conditions, and evidence of prior weight loss attempts.
If your state has mandated benefit laws requiring coverage for obesity treatment, cite them. Some states classify obesity as a disease and require insurers to cover FDA-approved treatments. If the denial stands after a standard appeal, many plans have an external review process where an independent reviewer evaluates your case. Ask your insurer about this option in writing.
Manufacturer Savings Programs
If your commercial insurance doesn’t cover these medications at all, manufacturer savings cards can reduce the cost significantly, though not to the level of a typical copay. Zepbound’s savings card, for example, brings the price down to $499 per month for eligible patients with commercial insurance that doesn’t cover the drug. You can use it for up to 13 fills per year, and the card is valid through December 2026.
There are important restrictions. You can’t use these savings cards if you’re on Medicare, Medicaid, or any other government insurance. You’re also ineligible if your plan participates in an alternate funding program that requires using the savings card as a condition of coverage. Check the manufacturer’s website for the most current terms, as these programs change frequently.
Practical Steps to Start Today
- Document everything now. Get a current weight on file with your doctor. If you have high blood pressure, sleep apnea, high cholesterol, or diabetes, make sure those diagnoses are clearly noted in your chart.
- Start a structured weight loss plan. Many insurers require six months of documented lifestyle intervention before approving medication. Nutritional counseling visits and exercise plans logged in your medical record count.
- Call your insurer before your doctor’s visit. Ask whether your plan covers anti-obesity medications, which drugs are on the formulary, and what prior authorization criteria apply. Get the answers in writing or take notes with the representative’s name and date.
- Ask your doctor to submit prior authorization proactively. Don’t wait for a pharmacy rejection. Have your doctor’s office submit the PA with all supporting documentation upfront.
- Check your plan’s formulary for cardiovascular coverage. If you have heart disease, ask your doctor whether prescribing Wegovy for cardiovascular risk reduction rather than weight loss changes your coverage status.