What You Can Buy With an FSA: The Complete Guide Including Gray-Zone Items, LMNs, and Spending Mistakes to Avoid

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The Core Categories: What FSA Funds Clearly Cover

Start with the unambiguous stuff, because there's a lot of it.

The clearest FSA expenses are the ones most people already know: copays, deductibles, coinsurance, prescription drugs, and services from licensed medical providers. Dentists, optometrists, therapists, chiropractors, surgeons — all covered. For you, your spouse, and any eligible dependents, even if they're not on your health insurance plan.

Beyond services, the product list runs longer than most people expect:

• OTC medications — pain relievers, allergy meds, cold and flu products, antacids, sleep aids. No prescription required. This changed in 2020 under the CARES Act, which removed the prescription requirement for over-the-counter drugs and medicines.
• Medical devices — blood pressure monitors, glucose meters and test strips, CPAP machines and supplies, knee and back braces, compression socks (therapeutic grade), hearing aids, and first aid kits.
• Baby and maternity supplies — breast pumps and lactation supplies are explicitly recognized as eligible. Nursing pads qualify too.
• Menstrual and incontinence products — also added by the CARES Act. Menstrual products including tampons, pads, cups, and discs are FSA-eligible.
• Wound care — bandages, antiseptics, gauze, and related supplies.
• Vision and dental supplies — contact lenses and solution, reading glasses, eye drops (medicated or lubricating for a diagnosed dry eye condition), toothache relief, orthodontics.

The authority for all of this flows from IRS Publication 502, which defines qualified medical expenses as amounts paid for the diagnosis, cure, mitigation, treatment, or prevention of disease, or for treatments affecting any structure or function of the body. That language — especially "mitigation" and "affecting any structure or function" — is precisely what creates the gray zone covered below.

Healthcare FSA vs. Limited-Purpose FSA vs. Dependent Care FSA: What Each One Actually Pays For

Not all FSAs are the same account. Using the wrong one for an expense is one of the most common — and fixable — mistakes people make.

Healthcare FSA is the broadest. It covers the full range of qualified medical expenses under Section 213(d): medical, dental, vision, OTC drugs, medical devices, and more. The 2026 contribution limit is $3,400 per employee. This is the account most people mean when they say "my FSA."

Limited-Purpose FSA (LPFSA) is typically restricted to dental and vision expenses only. It exists so people who have a Health Savings Account (HSA) can still get some FSA tax benefit, because HSA rules prohibit pairing a standard healthcare FSA with an HSA. If you're enrolled in an HSA-eligible high-deductible health plan, you likely have an LPFSA rather than a full healthcare FSA. Some plan designs do allow LPFSA funds to expand to general medical expenses after you've met your deductible, but that's a plan-specific feature, not a universal rule. Check your plan documents. For a deeper comparison, FSA vs. HSA breaks down how these accounts interact.

Dependent Care FSA covers childcare and adult dependent care — daycare, after-school programs, elder care while you work — so that you and your spouse can remain employed. The 2026 limit is $7,500 for single filers or married couples filing jointly, and $3,750 for married filing separately.

Here's the mistake people make: they assume dependent care FSA funds can pay their child's doctor bills. They cannot. A dependent care FSA is not a medical account. It covers the cost of *caring for* a dependent while you work, not the medical expenses of that dependent.

Practical scenario worth spelling out: a dual-income family where one spouse has an HSA-eligible plan and the other has a traditional employer plan. The HSA-holder uses an LPFSA for glasses and dental work. The other spouse's healthcare FSA handles pediatric copays and OTC meds. The dependent care FSA pays the daycare bill. Three accounts, three distinct lanes. Mixing them up creates correction headaches and potential tax problems.

Gray Zone: What Can You Buy With an FSA When the Answer Isn't Obvious?

This is where it gets interesting. The IRS standard — "primarily for medical care" — sounds simple until you're holding a $300 fitness tracker and wondering if your FSA can touch it.

The test is intent and primary purpose. If a product serves a medical function first and a general wellness or cosmetic function second, it leans eligible. If it's primarily about looking good, getting fit, or feeling generally well, it doesn't qualify. Even if it happens to benefit your health.

Sunscreen: eligible, with conditions. Sunscreen with SPF 15 or higher that provides broad-spectrum protection qualifies as an FSA-eligible medical product. General tanning products, bronzers, and sunless tanners do not — those are cosmetic.

Acne treatments: usually eligible. OTC products containing benzoyl peroxide or salicylic acid — Differin, Neutrogena Acne Wash, generic spot treatments — generally pass the medical care test. A cosmetic facial at a spa does not, even if it's "for acne."

Fitness trackers and smartwatches: generally not eligible. The IRS hasn't issued specific guidance on wearables, and plan administrators typically reject them. A Fitbit or Apple Watch purchased for general wellness tracking doesn't meet the "primarily for medical care" standard. That said, if your doctor prescribes a specific device to monitor a diagnosed condition — say, a cardiac arrhythmia — a Letter of Medical Necessity may shift that calculation. More on LMNs in the next section.

Wellness and mental health apps: depends on what they do. A telehealth app where you see a licensed therapist is almost certainly eligible; you're paying for a medical service. A meditation app or general stress-management platform is a harder case and typically requires an LMN. Check the app's own FSA eligibility documentation — some have worked with administrators to get pre-approval.

Massage guns: eligible with LMN, not for general recovery. Using a Theragun after a workout is general wellness. Using one to manage muscle spasms from a diagnosed condition, documented by a physician, is a different story. See our deep-dive on whether massage guns are FSA-eligible.

Gym memberships: almost never eligible. Honestly, this is the one people push on most, and the answer is almost always no. The IRS position is that general fitness isn't medical care. There's a narrow exception if a doctor has prescribed a specific exercise program for a specific diagnosed condition, and even then plan administrators vary on whether they'll approve it. More detail in our gym membership eligibility piece.

Lip balm: depends on formulation. Medicated lip products treating angular cheilitis or severely cracked lips as a medical condition may qualify. Standard cosmetic ChapStick does not.

Air purifiers: conditional. Often approved with an LMN for asthma or severe allergies. Without one, it stays in gray-zone territory — read the full breakdown on air purifier FSA eligibility.

How a Letter of Medical Necessity (LMN) Works — and Which Purchases Require One

An LMN is a written statement from a licensed healthcare provider connecting a specific product or service to a diagnosed medical condition. It doesn't make an ineligible expense eligible. What it does is document that an otherwise-ambiguous item meets the "primarily for medical care" standard for your particular situation.

Items that commonly require an LMN before a plan administrator will approve them:

• Air purifiers (for asthma, allergies, respiratory conditions)
• Ergonomic furniture, including standing desks (for back conditions, chronic pain)
• Fitness equipment prescribed for a specific rehabilitation need
• Massage devices (for diagnosed musculoskeletal conditions)
• Certain nutritional supplements or specialized formulas
• Weighted blankets (for anxiety disorders, sensory processing conditions)
• Probiotics or other supplements treating a diagnosed deficiency

What the LMN should include:

• The patient's diagnosed condition, using medical terminology where applicable
• The specific item or service being recommended
• How the item treats, mitigates, or manages the condition
• The expected duration of need, or a statement that it's ongoing treatment
• The provider's name, credentials, signature, and date

The IRS doesn't mandate a specific LMN format — that's left to plan administrators. But the content above is what most want to see. A vague note saying "this patient may benefit from better ergonomics" is not the same as "this patient has lumbar disc herniation at L4-L5 and requires an adjustable standing desk to relieve pressure during the workday." The specificity matters.

One thing to be clear about: an LMN does not guarantee approval. Your plan administrator makes the final call, and some are considerably more conservative than others. Before spending significant money on an LMN-dependent item, call your administrator first and ask directly whether they'll accept that category of expense with documentation.

How to Verify If a Specific Product Is FSA-Eligible Before You Buy

The cleanest approach: check before you spend, not after.

At pharmacies and major retailers, many FSA-eligible products are flagged automatically at the point of sale through a system called IIAS (Inventory Information Approval System). When you swipe your FSA debit card, the IIAS-enabled register separates eligible items from ineligible ones and only processes the FSA card for qualifying purchases. This is why your FSA card sometimes declines when you're buying a mix of aspirin and shampoo — the system is working as intended.

But IIAS approval isn't IRS certification. A store register accepting your FSA card for an item does not mean the IRS would agree it's eligible. If your employer audits FSA claims — and some do — a card swipe receipt alone won't protect you.

Practical steps before buying a gray-zone item:

• Check your plan administrator's eligibility list. Most publish one online. It's specific to your plan and can be more restrictive (or occasionally more permissive) than the IRS baseline.
• Search the retailer's FSA store. Amazon's FSA store and FSAstore.com are useful proxies — if a product is listed there, it's likely eligible. But these are commercial platforms, not IRS rulings.
• Call your administrator for edge cases. Five minutes on the phone before a $250 purchase is worth it.
• Keep itemized receipts. Always. Your FSA debit card receipt showing a dollar amount is not sufficient documentation on its own. You need a receipt showing the merchant, the date, a description of what was purchased, and the amount. For medical services, an Explanation of Benefits from your insurer often substitutes for a receipt.

If you use your FSA card on an ineligible item, you'll typically need to repay the amount to the plan. Unreimbursed non-qualified FSA expenditures are subject to income tax. Unlike HSAs — which carry a 20% excise tax penalty on non-qualified distributions — FSAs don't have the same statutory excise penalty, but the plan-level consequences (repayment demands, potential account suspension) are real. A card swipe does not close the loop.

Reimbursement Claims: Process, Timeline, and Mistakes That Get Claims Denied

If you paid out of pocket and want reimbursement, or if your FSA card transaction gets flagged for substantiation, you're in the claims process.

Submit after the expense occurs — not before. FSA rules require that the expense has already been incurred before you submit. You can't file a claim for an appointment next month.

What documentation you need:

• For medical services: An Explanation of Benefits (EOB) from your insurer showing the date of service, provider, service description, and your out-of-pocket amount. Some plans also accept itemized bills from the provider directly.
• For product purchases: An itemized receipt from the merchant — not a credit card statement showing a total charge. The receipt needs to show what was purchased, not just how much was spent.

The mixed-purchase problem comes up constantly. Say you walk into CVS and buy ibuprofen, a thermometer, some vitamins, and a magazine. The vitamins and magazine aren't eligible. If you paid with your FSA card, your administrator may send a substantiation request asking you to prove the eligible items. Submit the full register receipt without separating eligible from ineligible items, or if the receipt doesn't itemize clearly, and the claim can be denied in full. Solution: ring up FSA-eligible items separately when you can.

On timing: claims must generally be submitted within your plan's run-out period — the window after the plan year ends during which you can still submit receipts for expenses incurred that year. Run-out periods commonly run around 90 days, but they vary by plan.

If your plan offers a grace period instead of a carryover, you have up to 2.5 months after the plan year ends to incur new expenses. If it offers a carryover, you can roll up to $680 into the next plan year — but you can't have both features on the same plan. Honestly, the carryover rule trips everyone up at least once. The FSA grace period vs. carryover explainer walks through how to figure out which one your plan uses and which is worth more to you.

Quick-Reference FAQ: Common FSA Purchase Questions Answered

Can I buy groceries with my FSA? No, with a narrow exception. Ordinary food doesn't qualify. If a physician has prescribed a specific medically necessary diet to treat a diagnosed condition — celiac disease requiring gluten-free food is the classic example — the incremental cost above what you'd pay for regular food may be eligible, with documentation. In practice, this is hard to claim and rarely reimbursed without significant paperwork.

Are international pharmacy purchases eligible? Generally yes, if the expense meets the IRS definition of a qualified medical expense. Foreign receipts must still be itemized, showing the date, a description of what was purchased, and the amount. The geography of the purchase doesn't disqualify it on its own.

Can I use FSA funds for travel to a medical appointment? Yes. Transportation costs incurred primarily to receive medical care — mileage, bus fare, parking — are eligible. The IRS sets a standard mileage rate for medical travel; confirm the current rate at IRS.gov before calculating your reimbursement, since it adjusts periodically.

Is LASIK covered? Yes. LASIK and other corrective eye surgery are qualified medical expenses.

Are teeth whitening or other cosmetic dental procedures covered? No. Cosmetic procedures — whitening, veneers for appearance, elective cosmetic surgery — don't meet the medical care standard.

Can I buy a standing desk with my FSA? Only with an LMN from a physician tying it to a diagnosed condition. Without that documentation, it's a general wellness purchase and not eligible.

Does FSA cover therapy and mental health treatment? Therapy with a licensed mental health professional — yes. General mental wellness apps without a therapeutic relationship — typically no, unless you have an LMN or the platform has been pre-approved by your administrator.

Can I use FSA for a service dog? Potentially yes. The costs of a guide dog or service animal used for a diagnosed disability — including purchase, training, and ongoing care — may be eligible. Documentation connecting the animal to your medical condition is essential. Call your administrator before incurring these costs.

Are COVID tests eligible? Yes. At-home COVID tests are OTC medical products and have been FSA-eligible since the CARES Act changes. More details in our COVID test eligibility guide.

For anything not listed here, the framework is always the same: does it primarily serve a medical purpose as defined by IRS Publication 502? If yes, it likely qualifies. General health or wellness product? You probably need an LMN to make the case.