The difference between paying $25 and paying $1,000 for the same GLP-1 medication is usually not which provider you chose. It is whether your insurance covers anti-obesity medication, and whether anyone filed the paperwork properly. This guide covers how coverage works, what prior authorisation actually requires, how HSA and FSA funds apply, and what to do when a claim is denied.

Quick Takeaway:

• If your plan covers a GLP-1, filling under your pharmacy benefit almost always beats every cash price
• Many employer plans exclude weight loss medication from the formulary entirely, regardless of medical need
• Prior authorisation typically requires documented BMI, comorbidities, and prior intervention attempts
• Medically supervised weight management is generally an eligible HSA and FSA expense
• Manufacturer self-pay channels are the fallback when coverage is unavailable, not a substitute for it

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Step One: Check Your Formulary, Not Your Plan

The most common mistake is assuming that having health insurance means having GLP-1 coverage. These are separate questions.

Your formulary is the list of drugs your pharmacy benefit covers. Many employer plans place Wegovy and Zepbound in an excluded category — not a high tier, but excluded outright — because anti-obesity medication is an optional benefit that employers can decline to purchase. No amount of clinical justification overrides an exclusion.

Before anything else:

1. Find your plan's formulary, usually on the insurer's member portal
2. Search for Wegovy, Zepbound, or the drug you expect to be prescribed
3. Note whether it is covered, excluded, or requires prior authorisation
4. If unclear, call the number on your card and ask specifically: is Wegovy covered under my pharmacy benefit for weight management, and what are the prior authorisation criteria?

That one phone call determines which entire category of provider you should be looking at.

What Prior Authorisation Typically Requires

If your plan covers the medication with prior authorisation, expect the payer to ask for some combination of:

• Documented BMI at or above the threshold, often with a specified duration
• Comorbidity documentation — diagnosis codes for hypertension, dyslipidaemia, sleep apnoea, or type 2 diabetes
• Evidence of prior lifestyle intervention, sometimes a specified number of months
• Trial of alternative medications in some plans (step therapy)
• Attestation that the medication will be used alongside diet and physical activity
• Ongoing documentation of weight response for continued approval

This is why questionnaire-only telehealth platforms struggle with coverage: they do not generate the clinical documentation payers require. Providers that do this properly — LifeMD handles prior authorisation in-house, Circle Medical treats it as ordinary clinical care, Form Health bills insurance directly — are worth their fees precisely when coverage is achievable.

When You Are Denied

Denials are common and frequently reversible. In order:

1. Get the denial reason in writing. "Not covered" and "criteria not met" require completely different responses.
2. If criteria were not met, identify which one and have your clinician supply the missing documentation.
3. If it is a formulary exclusion, appeal is usually futile on clinical grounds — but ask whether a formulary exception process exists.
4. File the internal appeal within the stated deadline.
5. Escalate to external review if the internal appeal fails; in the US this is a right under most plans.
6. Ask about the alternative drug. Some plans cover Wegovy but not Zepbound, or vice versa.

Medicare and Medicaid

Medicare Part D has historically excluded medications used solely for weight loss, which is why manufacturer bridge programmes emerged. LillyDirect operates a Medicare GLP-1 Bridge programme with specific clinical criteria that must all apply when treatment is started, and Sesame advertises select FDA-approved GLP-1s at $50 per month for eligible Medicare patients with visit costs separate.

Coverage where the medication treats an approved non-weight indication — such as semaglutide for type 2 diabetes or for cardiovascular risk reduction in specific populations — follows different rules. Medicaid coverage varies by state.

HSA and FSA Eligibility

Medically supervised weight management is generally an eligible expense for Health Savings Accounts and Flexible Spending Accounts. Several providers state this explicitly:

• Sesame confirms that monthly care and medications through its weight loss programme qualify for HSA and FSA reimbursement
• Mochi Health identifies FSAs and HSAs as tools members can use for its programme
• Most telehealth providers accept HSA and FSA cards directly

Because HSA and FSA contributions are pre-tax, using them effectively reduces your cost by your marginal tax rate — often 20% to 35%. On a $300 monthly programme, that is $60 to $105 a month, which is a larger saving than switching providers usually delivers.

Pro Tip: Keep itemised receipts showing the service, date, provider, and amount. Some administrators require a Letter of Medical Necessity from your clinician for weight management expenses. Ask your provider for one proactively rather than after a reimbursement is rejected.

The Cash-Pay Hierarchy When Coverage Fails

If you have no coverage, the order of cost from lowest to highest generally runs:

Note that manufacturer channels do not include clinical care, so a bundled telehealth programme and a manufacturer purchase are not directly comparable. See our provider cost comparison.

Coverage Outside the United States

United Kingdom. The NHS funds tirzepatide within NICE-defined criteria, with phased rollout prioritised by clinical need. NHS treatment costs the standard prescription charge or nothing if you are exempt. Services such as Oviva deliver NHS-commissioned weight management free via GP referral. UK private medical insurance rarely covers weight loss medication — check your policy rather than assuming.

Elsewhere in Europe. Reimbursement varies substantially by country and typically depends on national formulary decisions and whether the indication is obesity or diabetes.

Frequently Asked Questions

Does insurance cover Wegovy or Zepbound?

It depends entirely on your specific plan's formulary. Many employer plans exclude anti-obesity medication outright, while others cover it with prior authorisation. Check your formulary directly rather than assuming, and call your insurer to confirm the prior authorisation criteria.

What does prior authorisation require?

Typically documented BMI at or above the threshold, diagnosis codes for qualifying comorbidities, evidence of prior lifestyle intervention, and sometimes a trial of alternative medications. Requirements vary by plan.

Can I use my HSA or FSA for GLP-1 treatment?

Generally yes. Medically supervised weight management is usually an eligible expense, and several providers explicitly confirm this. Keep itemised receipts, and ask your clinician for a Letter of Medical Necessity if your administrator requires one.

Does Medicare cover GLP-1s for weight loss?

Medicare Part D has historically excluded medications used solely for weight loss. Manufacturer bridge programmes exist for eligible patients — LillyDirect operates a Medicare GLP-1 Bridge programme with specific clinical criteria, and Sesame advertises select FDA-approved GLP-1s at $50 per month for eligible Medicare patients.

What should I do if my claim is denied?

Get the denial reason in writing, determine whether it is a criteria failure or a formulary exclusion, supply missing documentation through your clinician, file the internal appeal within the deadline, and escalate to external review if needed. Also ask whether an alternative covered drug exists.

Do telehealth membership fees count toward insurance?

Generally no. Most cash-pay telehealth memberships are not billed to insurance, and platforms like Hims & Hers and Lemonaid state this explicitly. Some practices, such as Circle Medical and Midi Health, do bill insurance for visits.

Bottom Line

Coverage is the single largest lever on what GLP-1 therapy costs you, and it is the first thing to investigate rather than the last.

Check your formulary before you compare providers. If the medication is covered, choose a provider that will actually file the prior authorisation. If it is excluded, stop paying for insurance navigation you cannot use and optimise for all-in cash cost instead. And use HSA or FSA funds either way — the tax saving usually exceeds what switching providers would give you.

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Medical disclaimer: Informational only, and not medical, tax, or insurance advice. Coverage, eligibility, and reimbursement rules vary by plan, employer, and jurisdiction, and change over time. Confirm details with your insurer and plan administrator.

Sources: Centers for Medicare & Medicaid Services coverage guidance; LillyDirect Medicare Bridge programme criteria; Sesame and Mochi Health published HSA/FSA statements; NICE tirzepatide guidance; IRS publications on medical expenses.

Date reviewed: August 2026