Insurance is the single biggest variable in what a GLP-1 costs you. A covered prescription with a manufacturer savings card can cost $25 a month; the same medication uncovered can cost over $1,000. Between those two numbers sits a paperwork process most people never learn how to work.
Why weight-loss coverage is so hard to get
Insurers have treated obesity medication differently from almost any other drug class. Three things drive it: many employer plans carve out weight-loss medication as an excluded category regardless of medical need; the drugs are expensive and, because obesity is chronic, the treatment is open-ended; and demand has been extraordinary. The result is that coverage for type 2 diabetes indications is common while coverage for weight management is patchy.
Practically, that means the first question is not “will my plan cover this?” but “does my plan cover this category at all?” If weight-loss medication is excluded from your benefit, no amount of documentation will change it, and you should move straight to comparing self-pay options.
How prior authorisation actually works
Where coverage does exist, it comes with prior authorisation almost without exception. Your prescriber submits clinical justification and the insurer decides before the pharmacy will fill it. Typical requirements:
- •Documented BMI meeting the plan's threshold (usually 30+, or 27+ with a comorbidity)
- •Diagnosis codes for any weight-related conditions
- •Sometimes evidence of a prior supervised weight-management attempt
- •Sometimes a requirement to try a cheaper medication first (step therapy)
- •Re-authorisation after a set period, often with documented weight loss to continue
This is where provider choice matters more than most people appreciate. A cash-pay compounded service cannot help you with any of it. Providers that bill insurance and submit prior authorisations on your behalf - and follow up on denials - are doing work that would otherwise fall to you and your prescriber.
Ask this before signing up
HSA and FSA: what actually qualifies
Health Savings Accounts and Flexible Spending Accounts let you pay with pre-tax dollars, which is effectively a discount equal to your marginal tax rate. The IRS position on weight loss is long-standing: amounts paid to participate in a weight-loss programme are a medical expense when the programme treats a specific disease diagnosed by a physician, such as obesity. General wellness or cosmetic weight loss does not qualify.
| Expense | Usually eligible? | What to keep |
|---|---|---|
| Prescribed GLP-1 medication | Yes, when prescribed for a diagnosed condition | Prescription and pharmacy receipt |
| Telehealth consultation fees | Generally yes - medical care | Itemised receipt naming the service |
| Lab work ordered by your provider | Generally yes | Lab invoice |
| Platform or membership fees | Often not - several providers state theirs are not eligible | Ask the provider in writing before assuming |
| CGM and coaching programmes | Sometimes - depends on your administrator | A letter of medical necessity strengthens the claim |
| Compounded medication | Generally yes when prescribed, but administrators vary | Prescription plus a receipt that names the medication |
The receipt problem
This trips people up more than eligibility does. Some providers issue only a plain purchase receipt - no medication name, no diagnosis code, no physician note. One provider we reviewed states exactly that: HSA and FSA cards are accepted, but if your administrator wants additional paperwork, codes or notes, it does not provide them. If you are planning to pay with HSA or FSA funds, ask what documentation you will receive before you order.
Letters of medical necessity
A letter of medical necessity is a short note from your clinician stating the diagnosis, the treatment and why the treatment is medically necessary for that diagnosis. It is the single most useful document for borderline HSA and FSA claims, and it costs nothing but a request. If your programme includes real clinician contact, ask for one at the outset rather than after a claim is rejected.
If you have no coverage at all
Most people using online GLP-1 services are in this position. The realistic options:
- •Manufacturer direct. Brand-name semaglutide from $149 to $199 a month, and Foundayo from $149 a month self-pay - FDA-approved product at a self-pay price
- •Manufacturer savings cards. Worth checking even without full coverage; commercially insured patients may qualify even when the drug is not on formulary
- •Flat-rate compounded plans. Cheaper, but not FDA-reviewed. Read the compounded guide first
- •Medicare Part D. Coverage has been expanding; Foundayo is expected at $50 a month for eligible Part D patients from as early as 1 July 2026