Can I use my HSA for ketamine therapy?

In many cases, yes — when the treatment is medically necessary and properly documented. IRS Publication 502 defines qualified medical expenses broadly as amounts paid for the diagnosis, cure, mitigation, treatment, or prevention of disease. Most HSA administrators want to see a clinical record supporting medical necessity. Confirm directly with your HSA administrator and your tax advisor before assuming an expense is eligible. This article is general information, not legal or tax advice.

Does FSA work the same way as HSA for ketamine?

The eligibility rules under IRS Publication 502 are similar — both accounts use the same definition of qualified medical expenses. The main differences are structural: FSA funds are typically use-it-or-lose-it within the plan year (with limited carryover or grace period rules depending on the plan), while HSA funds roll over indefinitely. Always check your specific plan documents and ask your administrator how they handle ketamine therapy claims.

What is a Letter of Medical Necessity?

A Letter of Medical Necessity (LMN) is a written statement from a clinician documenting your diagnosis and the medical reasoning for a specific treatment. For HSA and FSA purposes, an LMN helps support that the expense meets the IRS Publication 502 definition of a qualified medical expense. It typically includes the diagnosis, the recommended treatment, expected duration, and the clinician's signature and credentials.

Will my HSA debit card just work at the clinic?

Often yes. Many HSA debit cards run cleanly through medical merchant codes. If the card is declined, the standard path is to pay out of pocket and submit a reimbursement claim to your administrator with an itemized receipt and, when requested, a Letter of Medical Necessity. Keep all documentation for your tax records — IRS Publication 969 outlines recordkeeping requirements for tax-advantaged medical spending.

Should I talk to my CPA about using HSA or FSA funds for ketamine therapy?

Yes. This article provides general information based on IRS Publications 502 and 969, but it is not personal tax or legal advice. Your CPA or tax advisor can review your specific plan documents, your medical situation, and your tax position to confirm whether ketamine therapy expenses qualify in your case. We recommend that conversation before submitting larger claims.

Using an HSA or FSA for Ketamine Therapy

First: this is general information, not tax advice

Before anything else, the most important sentence in this article: nothing here is legal or tax advice. We are a ketamine clinic, not a CPA firm or a law office. What follows is general information about how Health Savings Accounts (HSAs) and Flexible Spending Accounts (FSAs) typically interact with medical care under federal tax rules. Your specific plan, your tax situation, and your medical record matter. For decisions that affect your taxes or your reimbursement claim, talk to your CPA or tax advisor and your plan administrator.

That disclaimer is not a formality. HSA and FSA rules are governed by the Internal Revenue Code and interpreted by the IRS through publications like Pub 502 and Pub 969, but the practical experience of using these accounts also depends on your individual employer plan, your bank or HSA custodian, and the documentation you keep. Two patients with similar diagnoses can have different outcomes depending on how their administrators handle a claim. So treat what follows as a roadmap, not a guarantee.

What IRS Publication 502 actually says

The foundational document is IRS Publication 502, Medical and Dental Expenses. It defines what counts as a qualified medical expense for HSA, FSA, and itemized deduction purposes. The IRS describes qualified medical expenses as amounts paid for “the diagnosis, cure, mitigation, treatment, or prevention of disease, or for the purpose of affecting any structure or function of the body.” That is a broad definition, and it is the framework most administrators use when they evaluate a claim.

Publication 502 explicitly includes amounts paid to physicians, surgeons, dentists, and other medical practitioners for medical care. It also includes prescription drugs and amounts paid for diagnostic devices and medical procedures. What it does not include are expenses that are “merely beneficial to general health,” such as gym memberships or vitamins not prescribed for a specific medical condition.

The relevance for ketamine therapy: when ketamine is administered by a licensed clinician for a documented medical condition — treatment-resistant depression, severe anxiety, PTSD, chronic pain — the cost generally falls within the broad Pub 502 definition. The condition is real, the clinician is qualified, and the treatment is part of a clinical plan. That said, eligibility ultimately turns on documentation and on your administrator's interpretation, not on the clinical reasoning alone.

How HSAs and FSAs differ

IRS Publication 969, HSAs and Other Tax-Favored Health Plans, is the companion document. It walks through contribution rules, qualified distributions, and recordkeeping requirements for tax-advantaged medical spending. The headline difference between an HSA and an FSA matters when you are planning ketamine treatment across a calendar year:

HSA (Health Savings Account): Available to individuals enrolled in a high-deductible health plan. Funds roll over indefinitely. The account is yours, even if you change jobs. Contributions and qualified distributions are tax-advantaged. Pub 969 outlines annual contribution limits, which the IRS adjusts each year.
FSA (Flexible Spending Account): Typically offered through an employer. Funds are generally use-it-or-lose-it within the plan year, although many plans offer a limited carryover or grace period. FSA dollars are pre-tax payroll contributions, and they can be spent on qualified medical expenses as defined by Pub 502.

For ketamine therapy planning, the structural difference matters most in two scenarios. First, if you have an FSA and you are committing to a multi-session protocol, you want to make sure your sessions land inside the plan year so the dollars are not forfeited. Second, if you have an HSA, you have more flexibility — you can pay now and reimburse yourself later, even years later, as long as you keep the documentation.

Where ketamine therapy fits in

Ketamine is FDA-approved as an anesthetic. Its use for depression, anxiety, PTSD, and chronic pain is off-label, meaning the FDA has not specifically approved ketamine for those indications even though the clinical evidence supports it. Esketamine (Spravato), a related compound, is FDA-approved for treatment-resistant depression and for major depressive disorder with acute suicidal ideation, per the Spravato Prescribing Information (U.S. Food and Drug Administration, 2019). That regulatory distinction matters when a plan administrator evaluates whether a treatment is medically necessary.

Off-label does not mean unrecognized. Many widely used treatments are prescribed off-label. The IRS Pub 502 definition of medical care does not require FDA on-label approval for an indication; it requires that the expense be for diagnosis, cure, mitigation, treatment, or prevention of disease. A clinician documenting a diagnosis of treatment-resistant depression and recommending ketamine therapy is making a clinical case that fits comfortably inside that definition. But administrators sometimes ask for extra documentation when a treatment is off-label, which is where the Letter of Medical Necessity comes in.

Patients sometimes ask whether the cost of ketamine therapy is treated differently from, say, a routine doctor's visit. From the Pub 502 standpoint, the analysis is the same: is it medical care delivered by a qualified provider for a documented condition? If yes, it generally qualifies. The price tag does not change the eligibility framework — it just means the documentation needs to be solid because larger claims attract more scrutiny. If you want a sense of typical pricing, see our cost overview.

The Letter of Medical Necessity (LMN)

A Letter of Medical Necessity is a written statement from your clinician documenting your diagnosis and explaining why the recommended treatment is medically appropriate. For HSA and FSA purposes, an LMN serves as evidence that the expense meets the Pub 502 definition. It is not always required, but it is often requested for off-label or higher-cost treatments. A useful LMN typically includes:

The diagnosis, with ICD-10 codes when applicable (for example, F33.2 for severe major depressive disorder, recurrent).
The clinical rationale for ketamine or esketamine therapy, including which prior treatments have been tried.
The recommended protocol and approximate duration — for instance, an induction series of six infusions over two to three weeks, with possible maintenance sessions.
The clinician's credentials, license number, and signature.
The date the letter was issued. Many administrators want the LMN dated within the same plan year as the expense.

An LMN does not guarantee approval, but it dramatically improves the chances that a claim is processed cleanly. Research suggests that documentation specificity is one of the strongest predictors of reimbursement success for off-label medical claims. If your plan administrator declines a claim, the LMN also gives you a stronger basis for an appeal.

What to ask your administrator before you commit

Before you spend HSA or FSA dollars on ketamine therapy, a fifteen-minute call to your plan administrator can save a lot of friction later. Useful questions include:

Do you accept ketamine therapy as a qualified medical expense under IRS Publication 502?
Do you require a Letter of Medical Necessity in advance, or only on audit?
If I pay with my HSA debit card and the card is declined, what is your reimbursement claim process?
What documentation do you want me to keep — itemized receipt, CPT/HCPCS codes, the LMN, anything else?
Are there any specific exclusions in my plan I should know about?

Take notes during the call. Plan administrators sometimes give different answers from different representatives, and a written record of what you were told helps if a claim is later contested. Studies indicate that patients who pre-verify coverage with their administrator have meaningfully fewer reimbursement disputes than those who submit claims without that step.

How patients typically pay at MCK

At Music City Ketamine, we see a few common payment patterns. The most straightforward is the HSA debit card swiped at the clinic; for most patients, the transaction processes cleanly because we are billed under medical merchant codes. When that works, the patient simply keeps the receipt for their tax records as required by Pub 969.

The second common pattern is pay-then-reimburse: a patient pays out of pocket — by credit card, ACH, or check — and submits the itemized receipt and, when requested, a Letter of Medical Necessity to their HSA or FSA administrator for reimbursement. This is also the standard fallback when an HSA debit card is declined for any reason. We provide an itemized receipt that lists the date of service, the procedure description, and the amount paid.

The third pattern, less common, is a patient who plans the treatment around their FSA election. If you know in advance that you intend to pursue ketamine therapy in the next plan year, you can elect a higher FSA contribution at open enrollment to cover the expected sessions. We have had patients approach us in November and December to map out a January-through-March protocol so that FSA dollars are used efficiently. Our team is comfortable providing whatever clinical documentation your accountant or administrator asks for, and Marla Peterson, CRNA, oversees every infusion and can sign clinical letters when appropriate. For the safety background that often appears in those letters, see our safety overview.

Year-end planning notes

A few practical notes that come up most years.

FSA deadlines are real. If your plan year ends December 31 and you have not used your balance, you may forfeit the unused funds depending on whether your plan offers a carryover or grace period. Check before December.
HSA receipts are forever. Pub 969 emphasizes recordkeeping. You can reimburse yourself from your HSA in a future year for an expense paid out of pocket today, but only if you have kept the documentation. Some patients keep a dedicated folder, physical or digital, of medical receipts and LMNs.
Talk to your CPA about itemized deductions. If you exceed the threshold for itemized medical deductions in a given tax year, your CPA can advise whether to claim the deduction directly versus using HSA/FSA dollars. The interaction matters and is fact-specific.
Do not double-dip. An expense paid with tax-advantaged HSA or FSA dollars cannot also be claimed as an itemized medical deduction. Pub 969 is explicit on this point.
Keep your clinician informed. If your administrator asks for additional documentation, let your clinic know early. We can usually provide what is needed quickly when we know the request is coming.

None of this is meant to overcomplicate something that is, for most patients, fairly simple in practice. HSA debit cards usually work. Itemized receipts are easy to keep. Letters of Medical Necessity are a standard clinical document. The main thing we want to leave you with is the framing: this is general information, not legal or tax advice, and the right people to confirm your specific situation are your tax advisor and your plan administrator. If you want a clinical conversation about whether ketamine therapy is a good fit and what documentation you might need, that part is what we can help with directly. For background on the clinic itself, see our overview of ketamine care in Nashville.