You see the ads everywhere: a weekly shot that melts away stubborn weight. But getting your hands on it is not as simple as asking your doctor. The approval process for weight loss shots like Wegovy or Zepbound is strict, and most people get denied the first time. To get approved for a weight loss shot, you must meet specific BMI requirements, have a documented weight-related health condition, and prove you have tried a supervised diet and exercise program first.
The process feels like jumping through hoops. Insurance companies use these hoops to make sure the drug is medically necessary, not just a cosmetic fix. This article walks you through the exact medical criteria, the paperwork your doctor needs, and the common roadblocks that trip people up. Most online advice skips the insurance reality — we will not.
Key Points at a Glance
| Point | What It Means | Why It Matters |
|---|---|---|
| BMI Requirement | You need a BMI of 30+ or 27+ with a weight-related condition. | This is the hard cutoff most insurers use for approval. |
| Documented Weight History | Your chart must show at least 6 months of weight records. | Without this, insurers flag the request as insufficient evidence. |
| Supervised Diet Attempt | Your doctor must document a structured weight loss program you tried. | Insurers want proof you tried lifestyle changes before medication. |
| Prior Authorization | Your doctor submits a detailed form to your insurance company. | This is where 80% of denials happen due to missing information. |
| Appeal Process | You can appeal a denial with additional documentation. | Most denials are overturned on appeal with the right paperwork. |
What Are the Exact Medical Criteria for Approval?
The FDA approval for weight loss shots like semaglutide and tirzepatide is clear. You need a body mass index of 30 or higher, which is classified as obesity. Or you need a BMI of 27 or higher with at least one weight-related condition like type 2 diabetes, high blood pressure, or high cholesterol.
Your doctor will measure your height and weight at the visit. They will also check your blood pressure and run basic lab work. I have seen patients who assume their old records count — they do not. The measurements must be from the same appointment where you discuss the shot.
Practical tip: Ask your doctor to check your BMI before you even mention the shot. If it is borderline, a 5-pound water weight fluctuation can push you over the cutoff. Schedule the appointment first thing in the morning when your weight is lowest.
How to Get Approved for Weight Loss Shot Through Your Insurance
Insurance approval is the hardest part. Most plans require a prior authorization form that your doctor submits. This form asks for your BMI, your weight history, and proof that you tried a supervised diet program for at least six months.
The biggest mistake people make is assuming their doctor knows what to write. Your doctor sees dozens of patients a day. They may rush the form and leave out key details like your failed attempts at Weight Watchers or a medical nutrition therapy program. You need to hand them a printed summary of your weight loss efforts.
What Documentation Do You Need to Bring to Your Appointment?
Bring a written log of your weight over the past year. This can be from a home scale, a gym check-in system, or a health app. Also bring a list of any weight-related health conditions you have, including dates of diagnosis.
Bring proof of any structured diet program you tried. This includes receipts, app subscriptions, or a letter from a dietitian. Insurers want to see that you spent time and money on lifestyle changes before asking for medication. I always tell people to bring their pharmacy printout too — it shows you filled medications for related conditions like high blood pressure.
What Happens If Your Insurance Denies the Request?
Denials are normal. Roughly 30 to 40 percent of initial prior authorization requests get rejected. The most common reason is missing documentation or a form that does not clearly state the medical necessity.
You have the right to appeal. Your doctor can submit a letter of medical necessity that explains why the shot is needed. You can also call your insurance company and ask for the specific reason for the denial. Sometimes the fix is as simple as having your doctor re-submit the form with your BMI clearly written in the right box.
What worked for one reader: She called her insurance and learned the denial was because her doctor listed her BMI as 29.8 instead of rounding up. A single decimal point cost her two weeks of delay. She asked the nurse to re-enter it as 30.0, and the appeal went through the same day.
What About Cash-Pay Options and Compounding Pharmacies?
If your insurance denies you or you do not have coverage, you can pay out of pocket. Brand-name Wegovy costs roughly $1,300 per month without insurance. Some manufacturers offer savings cards that bring the cost down to about $500 for the first few months.
Compounding pharmacies make a version of semaglutide that costs $200 to $400 per month. These are not FDA-approved and the dose accuracy varies between pharmacies. The American Society of Health-System Pharmacists has raised concerns about sterility and potency. This is a personal risk decision, not a straightforward alternative.
Frequently Asked Questions
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What BMI do you need for a weight loss shot?
You need a BMI of 30 or higher, or 27 or higher with a weight-related condition like high blood pressure or diabetes. Your doctor measures this at the appointment, not from a previous visit.
Can you get a weight loss shot without insurance?
Yes, you can pay cash at a medical weight loss clinic or through a compounding pharmacy. Expect to pay between $400 and $1,300 per month depending on the source and dose.
How long does the approval process take?
Most approvals take three to seven business days after your doctor submits the prior authorization form. Denials and appeals can add two to four weeks to the timeline.
What happens if your doctor does not support weight loss shots?
You can find a doctor who specializes in obesity medicine through the Obesity Medicine Association directory. Some telehealth services like Ro and Sequence also handle the full approval process remotely.
Do you need to stop other medications before starting the shot?
Your doctor will review your current medications to check for interactions. You typically do not stop other medications, but doses for diabetes drugs like insulin may need adjustment.
How much weight do people lose on these shots?
Clinical trials show an average weight loss of 15 to 20 percent of body weight over 68 weeks. Individual results vary widely, and some people lose very little weight.
Use our TDEE Calculator to find your maintenance calories. This number helps your doctor see your baseline and proves you understand the energy balance side of weight management.
The TDEECAL Team writes about nutrition, metabolism, and fat loss the way we built our calculator, with real numbers and no hype. We dig into the research so you don’t have to guess.