How HSA Reimbursement Works

Short answer

You can reimburse yourself from your HSA for any qualified medical expense you paid for out of pocket. The process takes five steps. You spend money on the expense, save your receipt, and request reimbursement from your HSA administrator. The administrator reviews the request and documentation, then pays you out of your account by direct deposit or check.

For expenses that need a letter of medical necessity, Burst writes and files the reimbursement claim on your behalf, and your administrator pays you the same way. This works with every HSA administrator, every account holder, and every qualified expense.

You control the timing. Pay out of pocket now, build your HSA balance over time, and get reimbursed when you need the money back.

The path in five steps

HSA reimbursement is a straightforward process. You buy a qualified medical expense, save your receipt, ask your HSA administrator to reimburse you, they review your request, and they pay you back. All five steps happen without friction.

1. You pay for a qualified medical expense with your own money. This could be a purchase, a service, or a copay or deductible. You could use any card, cash, or check. The IRS defines a qualified medical expense as “the costs of diagnosis, cure, mitigation, treatment, or prevention of disease”, and the expense has to fit that definition under your plan.

2. You save documentation. Keep your receipt, invoice, or itemized statement showing what you bought, who you bought it from, the date, and the amount. If the expense requires a letter of medical necessity, Burst can write and file that on your behalf.

3. You request reimbursement. Sign in to your HSA administrator's website or app and submit a reimbursement request. You will upload your receipt and provide basic information about the expense. Some administrators have web portals, apps, or phone numbers for this. Instructions are on your administrator's website or on the back of your HSA card.

4. Your administrator reviews your request. They check that the expense is covered under your plan and that it qualifies under IRS Publication 969. They may ask for more documentation if something is unclear. If everything checks out, they approve the request. If not, they send you a denial explaining why.

5. You get paid. Your administrator pays you by direct deposit into the bank account you registered, or by check if that is your preference. The payment includes the full amount you requested. Money comes from your HSA balance. It takes typically five to ten business days from the date your administrator approves the request.

This process reverses the normal spending flow: instead of swiping your HSA card at the point of sale, you pay with your own money and let your account pay you back later. Many people choose reimbursement for the control over timing, and because it works at any merchant.

What your administrator asks for

Your HSA administrator will ask for proof of the expense. IRS Publication 969 says you “must keep records sufficient to show that the distributions were exclusively to pay or reimburse qualified medical expenses”. Different expenses need different documentation, and your administrator will tell you what is enough.

Receipt or invoice

For most expenses, a receipt or invoice from the merchant is enough. It should show the date, the merchant name, the item or service, the amount paid, and ideally a line-item breakdown. A credit card statement alone is not enough. A pharmacy receipt, a doctor's office invoice, a medical device receipt, a lab test invoice, or a dental bill all count. Take a photo of paper receipts or download digital ones from the retailer. Upload them through your administrator's website or app.

Itemized statement

If the receipt is not itemized, your administrator may ask for an itemized statement showing what was purchased. A pharmacy receipt might show you bought band aids, a pain reliever, and a compression sleeve. An itemized statement makes clear which items qualify as medical expenses.

Letter of medical necessity

If your plan or the IRS rules say the expense needs a letter, your administrator will ask for it. A letter of medical necessity is a one-paragraph statement from a licensed clinician explaining the diagnosis and how the purchase treats it. For gym memberships, physical therapy, certain supplements, or other conditional expenses, the letter makes the difference between reimbursable and not reimbursable. Burst writes and files these letters on your behalf. The letter has to be dated on or before the purchase it covers, so request it before you buy.

Proof of payment

Your administrator may ask how you paid: a credit card statement, a bank statement, a cancelled check, or a payment confirmation from the merchant. This is a standard check to confirm you actually paid for the expense yourself.

Explanation of benefits (EOB)

If the expense involved your medical insurance, your administrator may ask for an EOB from your health plan showing your cost and what your insurance paid. This is important for deductibles, copays, and coinsurance amounts that you paid out of pocket. Your health plan sends the EOB. You can request it online, by phone, or through their website.

Direct deposit versus check, and timing

Once your administrator approves a request, they pay you. The method and speed depend on their process.

Direct deposit

Most administrators offer direct deposit as the fastest method. The administrator pays you out of your account by deposit to the bank account you registered. Setup is usually one time: you provide your routing and account number when you open the account or later in your account settings. Direct deposit transfers take one to three business days after your administrator initiates the payment.

Check

If you prefer a check, you can request one. Your administrator mails the check to the address on file. A mailed check takes five to ten business days to arrive, plus one to three days for you to deposit it and for your bank to clear it. Checks are slower than direct deposit.

Timeline from submission to payment

After you submit a reimbursement request, your administrator reviews it. Most administrators confirm receipt within one business day and complete their review within five business days. If your documentation is complete, they approve and initiate payment at that point. By direct deposit, you typically see the money within five to ten business days total from submission. By check, add another five to ten days for delivery and deposit.

If your administrator asks for more documentation, the timeline pauses while you respond. The clock resets once you submit the additional information. Do not worry about this. It is normal and does not mean there is a problem. It just means they need clarification on one item or another.

Denials and appeals

Most requests are approved, but an administrator sometimes denies one. Knowing why, and what your options are, takes the mystery out of it.

Common reasons for denial

An administrator denies a reimbursement request when they believe the expense does not qualify under your plan, IRS rules, or both. Here are the most common reasons.

• The expense does not qualify under IRS Publication 969. For example, cosmetic work, general wellness items, or gym memberships (without a letter) do not qualify.

• The expense was paid before your plan year started or after it ended, and is outside the window for reimbursement.

• The expense is not covered by your specific plan. Your plan document may exclude certain items that IRS rules would otherwise cover. Administrators apply their own plan rules.

• The letter of medical necessity is missing or insufficient. If a letter is required and you did not provide one, or if the letter does not adequately explain the diagnosis and treatment, the request is denied.

• Documentation is incomplete or missing. If you did not provide a receipt, an EOB, or proof of payment, the administrator cannot verify the expense.

• The merchant is not recognized as a medical provider. If you buy a medical item at a general retailer, the administrator may deny it because the seller does not code as medical.

• The amount is wrong or does not match the receipt. A clerical error in the dollar amount, or a mismatched date between the receipt and the request, can trigger a denial.

• The expense was already paid or reimbursed from another source. IRS Publication 969 requires proof that “the qualified medical expenses hadn't been previously paid or reimbursed from another source”, so claiming an expense your insurance or another plan already covered gets denied.

How an appeal works

Your plan gives you appeal rights. These are governed by your plan document and Department of Labor rules. If you disagree with a denial, you can appeal.

Contact your administrator and ask for the formal appeal process, which they will explain based on your plan. Most plans let you submit a written appeal with new or clarifying documentation: a letter of medical necessity you did not have before, documentation that was missing, or an explanation of why the denial was wrong on the facts.

Your administrator will reconsider. An overturned denial gets paid. If they stand by it, you get a second decision letter explaining why, plus any further appeal rights under your plan. Burst writes the appeal for a letter of medical necessity issue. For any other denial reason, we help you understand it, though the appeal itself runs between you and your administrator.

How Burst handles it for members

For expenses that require a letter of medical necessity, Burst simplifies the entire process. You do not file the claim yourself. Burst does.

When you request a letter through Burst, you provide the details of your expense and purchase. A licensed clinician reviews your condition and writes a one-paragraph letter explaining how the purchase treats it, dated on or before your purchase date. Burst files the reimbursement claim with your HSA administrator, and the administrator pays you out of your account by direct deposit or check.

Your administrator typically processes the reimbursement request within five to ten business days after they receive it, the same window as any other HSA reimbursement request.

If your administrator denies the claim, Burst writes the appeal. We draft a stronger letter, clarify the clinician's findings, and resubmit. The appeal process happens without extra cost. You do not have to know how claims and appeals work. We handle the entire process on your behalf.

For expenses that do not need a letter, you can request reimbursement directly from your HSA administrator using the five-step process described above. You do not need Burst for those. The letter is only needed when your plan or the IRS rules require one to qualify. See which expenses qualify outright and which need a letter.

Getting it reimbursed with Burst

Burst handles the letter and the claim. You request the letter of medical necessity in about two minutes for $35, a licensed clinician reviews it, and it typically lands in your inbox within 24 hours. Burst files the reimbursement claim with your FSA, HSA or HRA administrator. The administrator pays you out of your account by deposit or check. No letter, no charge. Claim denied, money back. Request it before you buy, because the letter has to be dated on or before the purchase it covers.

Get reimbursed for my medical expense

Frequently asked questions

How do I request an HSA reimbursement?

Sign in to your HSA administrator's website or app, submit a reimbursement request, upload your receipt, and provide the expense details. Your administrator will review it and pay you out of your account by direct deposit or check, typically within five to ten business days.

What documentation do I need to get reimbursed?

A receipt or invoice showing the date, merchant, item, and amount. If your plan requires a letter of medical necessity, Burst can write that for you. Some administrators may ask for an EOB or proof of payment.

How long does HSA reimbursement take?

Most administrators process requests within five business days. Direct deposit takes one to three business days, so you typically see money five to ten business days after you submit. Mailed checks take longer.

Will my HSA deny my reimbursement request?

Most requests are approved. Denials happen when the expense does not qualify under IRS rules or your plan rules, documentation is missing, or a required letter is not provided. You have appeal rights if you disagree.

Can I appeal an HSA reimbursement denial?

Yes. Contact your administrator for the appeal process. You can submit new documentation or a stronger letter. If the denial was for a letter of medical necessity, Burst can write the appeal at no extra cost.

What is the difference between using my HSA card and requesting reimbursement?

The card pays at the point of sale (and sometimes declines). Reimbursement means you pay out of pocket and ask your administrator to pay you back. Both draw from the same account. You control the timing with reimbursement.

Do I need a letter for every HSA reimbursement?

No. Most expenses qualify outright and need no letter. You only need a letter if your plan or the IRS rules require one. See which expenses need a letter.

Can I reimburse myself for a past purchase?

If the expense already qualifies outright, yes, as long as you're within your plan's deadline for submitting requests. If it needs a letter of medical necessity, the letter has to be dated on or before the purchase, so request it before you buy.

Keep reading: Which expenses qualify for HSA reimbursement, HSA basics and how it works, HSA distributions and withdrawal rules, When your HSA card works and when it declines, and all guides on this topic.

Sources

• IRS Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans (HSA reimbursement rules, qualified medical expenses under Section 213(d), the recordkeeping requirement, and that administrators check against plan and IRS rules)

• IRS Publication 502, Medical and Dental Expenses (The definition of a qualified medical expense that HSA administrators apply when reviewing a reimbursement request)

• Instructions for Form 8889, Health Savings Accounts (HSAs) (How HSA distributions for qualified medical expenses are reported on Form 8889 with the account holder's federal income tax return)