Can You Use an HSA or FSA for a GLP-1 if Insurance Will Not Pay?

The short answer

If your health insurance will not pay for a prescribed GLP-1 drug, you may still be able to use HSA or health FSA money for the expense.

But the insurance denial is not what makes the expense eligible.

The IRS starts with a different question: is the expense a qualified medical expense? IRS guidance says medical expenses include costs for diagnosis, cure, mitigation, treatment, or prevention of disease, as well as expenses affecting a part or function of the body. They also include medicines and drugs prescribed by a physician. Expenses that are merely beneficial to general health do not qualify. [1]

IRS Publication 502 separately confirms that amounts paid for prescribed medicines and drugs can be included in medical expenses. [2]

The IRS also says that medical expenses qualifying under section 213 can be paid or reimbursed through an HSA or health FSA, subject to the rules governing those accounts. [1]

The IRS materials reviewed for this article do not contain a special rule declaring "GLP-1 drugs" eligible as a category. The more precise conclusion is this:

A prescribed GLP-1 used for qualifying medical care can generally fall within the medical-expense rules used by HSAs and health FSAs, provided the other rules for the account are satisfied. [1] [2] [3]

Whether your insurance company pays for the drug is a separate question.

Why a prescribed GLP-1 can qualify

For tax purposes, the important fact is not simply that a medicine belongs to the GLP-1 drug class.

It is that the expense qualifies as medical care.

IRS guidance says medical expenses must be primarily for medical care rather than merely for improving general health. It specifically includes medicines and drugs prescribed by a physician among medical expenses. [1]

Publication 502 likewise states that amounts paid for prescribed medicines and drugs can be included in medical expenses. [2]

FDA prescribing information confirms that individual GLP-1-related medicines are prescription drugs with specific medical indications.

For example, FDA prescribing information identifies Wegovy as a GLP-1 receptor agonist. Its labeled uses include long-term weight reduction in adults with obesity and in adults with overweight plus at least one weight-related comorbid condition, among other indications. [6]

Mounjaro is identified by the FDA as a GIP and GLP-1 receptor agonist indicated, with diet and exercise, to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus. [7]

Those FDA labels establish what the individual drugs are approved to treat. They do not determine HSA or FSA eligibility.

The tax analysis comes from IRS medical-expense rules. [1] [2] [3]

What changes if insurance will not pay?

An insurance denial can change how much of the prescription you have to pay yourself.

It does not, by itself, turn an expense into a qualified medical expense.

For HSA purposes, IRS Publication 969 says qualified medical expenses generally mean amounts paid for medical care as defined in section 213, but only to the extent those amounts have not been compensated by insurance or otherwise. [3]

That means there are two separate questions:

1. Is the expense a qualified medical expense?
2. Has somebody else already paid or reimbursed that expense?

If your insurer denies the claim entirely, the prescription may be left as an unreimbursed expense. But "unreimbursed" does not automatically mean "qualified."

The underlying medical-expense rules still have to be satisfied. [1] [3]

If insurance pays only part of an otherwise qualifying expense, the uncompensated portion is the amount relevant to the HSA analysis. [3]

Health FSAs have a related rule. Publication 969 says an FSA claimant must certify that the expense has not already been paid or reimbursed under other health plan coverage. [3]

So insurance refusing to pay can make HSA or FSA funds more useful because you are now responsible for the bill. The denial itself is not the tax rule that makes the expense eligible.

Paying for a GLP-1 with an HSA

For an HSA, the central question is whether the money is being used for a qualified medical expense.

Publication 969 says qualified medical expenses generally include medical care under section 213 that has not been compensated by insurance or otherwise. [3]

The HSA owner also carries the recordkeeping responsibility.

The IRS says you should maintain records showing that HSA distributions were used for qualified medical expenses, that the expenses had not previously been paid or reimbursed from another source, and that you did not also take those expenses as an itemized medical deduction. [3]

There is another rule that is easy to miss.

The expense must be incurred after the HSA was established.

Publication 969 specifically states that expenses incurred before an HSA is established are not qualified medical expenses for HSA purposes. [3]

So if you are considering using an HSA for a prescribed GLP-1, ask:

• Is the prescription expense qualifying medical care?
• Was the expense incurred after the HSA was established?
• Has insurance or another source already reimbursed it?
• Do you have records supporting the expense?

An insurance denial may answer the reimbursement question. It does not replace the other requirements.

Paying for a GLP-1 through a health FSA

A health FSA is similar, but the plan itself plays a larger role.

Publication 969 says health FSA qualified medical expenses are those specified in the plan that would generally qualify for the medical and dental expense deduction. [3]

FSA claims must also be substantiated.

The IRS says the participant must provide the health FSA with a written statement from an independent third party showing that the medical expense was incurred and stating its amount. The participant must also certify that the expense has not been paid or reimbursed under other health plan coverage. [3]

Timing matters here too.

Publication 969 says health FSA distributions generally reimburse qualified medical expenses incurred during the participant's period of coverage. [3]

That means having an FSA at some point during the year does not necessarily make every expense incurred during that calendar year reimbursable. The expense generally needs to fall within the applicable coverage period, subject to the plan's rules.

The IRS sources reviewed for this article do not establish a universal rule requiring a Letter of Medical Necessity for every prescribed GLP-1 FSA claim.

That does not mean an FSA administrator can never request additional documentation. It means there is no GLP-1-specific universal LMN rule in the IRS materials reviewed here.

Your own FSA plan and administrator's substantiation requirements therefore matter.

What if the GLP-1 is being used for weight loss?

This is where the rules can easily become confused.

The IRS has specific guidance for weight-loss programs.

Its FAQ says the cost of a weight-loss program can qualify when the program treats a specific disease diagnosed by a physician, giving obesity, diabetes, hypertension, and heart disease as examples. Otherwise, the cost of a weight-loss program is not a medical expense. [1]

Publication 502 states the same basic distinction for weight-loss programs. [2]

But a weight-loss program and a prescribed drug are not identical categories in the IRS guidance.

Publication 502 separately states that prescribed medicines and drugs can be medical expenses. [2]

That does not mean prescription status alone resolves every case. The expense must still fit within the underlying medical-care framework. The IRS says medical expenses must be for medical care and not merely for general health. [1]

The FDA indication also does not independently settle the tax question.

For example, Wegovy has FDA-labeled weight reduction indications, while Mounjaro's FDA-labeled indication is for glycemic control in type 2 diabetes. [6] [7]

Those are FDA regulatory determinations. HSA and FSA treatment is determined under the applicable tax and plan rules.

The IRS materials reviewed here also do not establish a categorical GLP-1-specific rule for off-label prescribing. It would therefore go beyond the evidence to say that every off-label GLP-1 prescription either automatically qualifies or automatically fails.

FDA approval and HSA eligibility are different questions

It helps to separate three decisions that are often treated as though they are the same:

FDA approval: What has the FDA approved this particular product to treat?

Insurance coverage: Will your health plan pay for this prescription under its own benefit and formulary rules?

HSA or FSA qualification: Does the expense satisfy the federal medical-expense rules and the additional requirements governing the account?

One answer does not automatically determine the others.

An insurer can refuse to cover an expense that still qualifies for HSA or FSA treatment.

Likewise, the fact that a drug has an FDA-approved indication does not, by itself, establish tax qualification.

How much can you contribute in 2026 and 2027?

For plan years beginning in 2026, the health FSA salary-reduction contribution limit is $3,400. [4]

For 2026, the HSA contribution limits are:

• $4,400 for self-only HDHP coverage.
• $8,750 for family HDHP coverage.
• An additional $1,000 for a qualifying individual age 55 or older. [4]

The IRS has already published the 2027 HSA figures. For 2027, the contribution limits rise to $4,500 for self-only HDHP coverage and $9,000 for family HDHP coverage. The additional amount for a qualifying individual age 55 or older remains $1,000, because that figure is set by statute rather than adjusted for inflation. [5]

As of August 2026, the IRS has not published the 2027 health FSA contribution limit. That figure is normally announced later in the year, after the HSA amounts. If you are planning a 2027 FSA election during open enrollment, confirm the current published figure before relying on any number. [4] [5]

These are contribution limits. They are not necessarily the amount available in an existing HSA.

Unlike an FSA, money remaining in an HSA generally carries over from year to year. Someone who has accumulated HSA funds over several years may therefore have considerably more available than the current year's contribution limit. [3]

A Medicare rule to know after age 65

For readers approaching Medicare, there is another important distinction.

IRS guidance says no HSA contributions can be made after an individual becomes enrolled in Medicare Part A or Part B. [4]

That is a contribution rule.

It does not mean an existing HSA disappears when you enroll in Medicare. Existing HSA funds can continue to receive the tax treatment applicable to distributions used for qualified medical expenses. [3]

Five mistakes to avoid

1. Assuming insurance denial proves eligibility

It does not.

Insurance nonpayment may leave you with an unreimbursed bill, but the expense still has to qualify as medical care under the applicable rules. [1] [3]

2. Getting reimbursed twice

For an HSA, qualified medical expenses are limited to amounts not compensated by insurance or otherwise. [3]

For a health FSA, the claimant must certify that the expense has not been paid or reimbursed under other health plan coverage. [3]

3. Ignoring when the expense was incurred

For an HSA, the expense must have been incurred after the HSA was established. [3]

For a health FSA, qualified medical expenses generally must be incurred during the applicable coverage period. [3]

4. Assuming every GLP-1 drug has the same FDA indication

They do not.

Wegovy and Mounjaro are both GLP-1-related medicines, but their FDA-labeled indications are not identical. [6] [7]

5. Treating a weight-loss program and a prescription as the same expense

IRS guidance addresses weight-loss programs separately from prescribed medicines and drugs. [1] [2]

The rules applicable to one should not automatically be copied onto the other.

A practical way to check your expense

If you are considering using HSA or FSA money for a GLP-1 prescription, work through the questions in this order.

First, identify what you are paying for. Is it the prescribed medicine itself, or a separate membership, coaching service, weight-loss program, food product, or other expense? Different rules may apply. [1] [2]

Second, determine whether the expense is for qualifying medical care. Prescription status is important, but the medical-purpose requirement still matters. [1] [2]

Third, check whether insurance paid any of the expense. For an HSA, the qualified amount is limited to the amount not compensated by insurance or otherwise. [3]

Fourth, check timing. For an HSA, the expense must have been incurred after the account was established. For an FSA, it generally needs to have been incurred during the applicable coverage period. [3]

Fifth, keep or submit the required documentation. HSA owners are responsible for maintaining records supporting tax-free distributions. FSA claims must satisfy the plan's substantiation requirements. [3]

If you are uncertain about a particular prescription or reimbursement, check the terms of your own FSA plan or seek individual tax advice rather than assuming the drug's brand name or your insurer's denial determines the answer.

Bottom line

A prescribed GLP-1 can generally fall within the federal medical-expense framework used for HSA and health FSA reimbursement when the expense is qualifying medical care and the other account requirements are satisfied. [1] [2] [3]

But the IRS sources reviewed for this article do not contain a blanket rule declaring every GLP-1 prescription automatically HSA or FSA eligible.

If insurance refuses to pay, that can leave you with an unreimbursed expense. It does not independently make the expense qualified.

For an HSA, you also need to consider whether the expense was incurred after the HSA was established, whether another source reimbursed it, and whether you have adequate records. [3]

For a health FSA, the plan's eligible-expense rules, coverage period, and substantiation requirements matter. [3]

The simplest way to think about it is this:

Insurance determines whether your health plan pays. The tax rules determine whether your HSA or FSA can.

Sources

1. Internal Revenue Service. Frequently Asked Questions About Medical Expenses Related to Nutrition, Wellness and General Health. Added March 17, 2023. Establishes the section 213 medical-care test, connects qualifying medical expenses with HSA and FSA reimbursement, and addresses weight-loss programs.

2. Internal Revenue Service. Publication 502: Medical and Dental Expenses (2025). Establishes IRS treatment of prescribed medicines and drugs and addresses weight-loss programs.

3. Internal Revenue Service. Publication 969: Health Savings Accounts and Other Tax-Favored Health Plans (2025). Establishes HSA qualified medical expense, reimbursement, account-establishment, recordkeeping, FSA coverage-period, and substantiation rules.

4. Internal Revenue Service. Publication 15-B (2026), Employer's Tax Guide to Fringe Benefits. Provides the 2026 health FSA and HSA contribution limits and the Medicare enrollment rule for HSA contributions.

5. Internal Revenue Service. Revenue Procedure 2026-24. May 29, 2026. Establishes the 2027 inflation-adjusted HSA contribution limits and high deductible health plan parameters.

6. U.S. Food and Drug Administration. WEGOVY (semaglutide) prescribing information. Revised June 2026. Establishes Wegovy's GLP-1 classification and FDA-labeled indications reviewed here.

7. U.S. Food and Drug Administration. MOUNJARO (tirzepatide) prescribing information, pediatric indication expansion approved December 2025. Establishes Mounjaro's GIP and GLP-1 classification and FDA-labeled type 2 diabetes indication in adults and pediatric patients aged 10 years and older.

This article provides general information about federal tax rules and is not individualized tax, insurance, or medical advice.