Letter of Medical Necessity for Gym Membership: What It Is & How to Get One

Adam Z. Kawalek, MD

June 15, 2026 · 6 min read

A gym membership is not an eligible HSA or FSA expense on its own. With a Letter of Medical Necessity, it can be. I have practiced medicine for over 15 years, and in this guide I will explain exactly what this letter is, who qualifies for one, what it must contain, and how the reimbursement actually works. No hype, just the rules.

What is a Letter of Medical Necessity?

A Letter of Medical Necessity, or LMN, is a signed document from a licensed healthcare provider. It states that a specific product or service is needed to treat, manage, or prevent a diagnosed medical condition. That last part is the key. The letter does not say exercise is good for you. Everyone knows exercise is good for you, and that is exactly why the IRS does not treat it as a medical expense by default. The letter says something much more specific: this patient has this condition, and I am recommending this exercise program as part of managing it. When that connection exists, a gym membership can shift from a personal expense to a medical one in the eyes of your HSA or FSA administrator.

Why gym memberships are not eligible by default

HSAs and FSAs follow IRS rules, specifically Section 213(d) of the tax code. That section defines medical care as expenses for the diagnosis, treatment, or prevention of disease.

The IRS draws a hard line between medical care and general health. Vitamins for general wellness, a standing desk, a gym membership to stay in shape: these are considered personal expenses, even though they are clearly good for you. IRS Publication 502 says it plainly: you cannot include health club dues paid for general health.

But the same rules allow an exception. If an expense exists primarily to treat a specific medical condition, and you would not have paid for it otherwise, it can qualify. Tax professionals call this the "but for" test. But for your diagnosed condition, you would not be joining the gym. The Letter of Medical Necessity is the document that establishes this. It is the bridge between the IRS rule and your gym membership.

Who qualifies for an LMN for exercise?

You need a real medical condition that exercise helps treat or manage. In my practice, the most common qualifying conditions include:

Obesity or being overweight with related health risks High blood pressure (hypertension) Type 2 diabetes or prediabetes High cholesterol Heart disease or cardiac rehabilitation needs Chronic back, joint, or muscle pain Anxiety and depression Osteoporosis or low bone density This list is not complete, and having a condition on it does not automatically qualify you. A licensed provider has to review your situation and decide, in their professional judgment, that an exercise program is appropriate for managing your specific condition. And to be direct: if you are perfectly healthy and simply want a tax break on your gym membership, you do not qualify. A provider who signs a letter for someone with no medical basis is putting their license at risk, and you are putting yourself at risk in an audit. I will not sign those letters, and you should be suspicious of any service that promises everyone qualifies.

What a valid LMN must contain

Administrators reject letters that are vague or incomplete. A valid Letter of Medical Necessity should include:

• Your full name and date of birth -The diagnosed condition being treated or managed -The recommended treatment, stated specifically (for example, a structured exercise program through a gym membership) -How the treatment addresses the condition (for example, regular aerobic and resistance exercise to lower blood pressure and support weight reduction) -The duration of the recommendation, usually 12 months -The provider's full name, credentials, and license information -The provider's signature and the date

Here is what the core of a strong letter sounds like:

"This patient has been diagnosed with hypertension. I am recommending a structured exercise program, including a gym membership, as a necessary part of managing this condition. This recommendation is valid for 12 months from the date below."

Short, specific, and signed. That is what holds up.

How to get a Letter of Medical Necessity

You have two routes.

Route one: your own doctor. If you have a primary care physician who knows your history, ask at your next visit. Many doctors will write the letter, especially if they have already told you to exercise more. The downside is timing. If your next appointment is months away, or you would need to book a visit just for the paperwork, you are paying a copay and waiting weeks for a one-page letter.

Route two: an online physician documentation service. At MedSlip, you fill out a short health questionnaire describing your condition and history. I review every request personally. If your situation supports it, you receive a signed Letter of Medical Necessity, usually within hours, for $40. If your situation does not support it, you do not get a letter. That is the honest trade: it is fast and inexpensive, but it is real physician review, not a rubber stamp.

To be clear about what MedSlip is: it is a physician documentation service. I review the information you provide and issue signed documentation when it is medically appropriate. It is not medical care, and it does not replace your own doctor for diagnosis or ongoing management.

How reimbursement actually works

Once you have your letter, here is the typical process:

• Pay for your gym membership as you normally would, and keep the receipts.

-Submit a claim to your HSA or FSA administrator. This is usually done through their website or app. Attach your receipt and the Letter of Medical Necessity.

-Wait for review. Most administrators respond within a few days to a couple of weeks.

-Get reimbursed from your pre-tax funds, or have the expense approved if you paid with an HSA/FSA card.

Keep your letter and receipts for your records. HSA purchases can be reviewed by the IRS years later, and the letter is your supporting documentation. Plan to renew the letter every 12 months if you continue claiming the expense.

What an LMN does not do

I want to be straight with you, because some companies in this space are not.

An LMN supports your claim. It does not guarantee approval. Your administrator makes the final call, and policies differ between companies like HealthEquity, Optum, Fidelity, and WEX. Most accept properly written LMNs for qualifying conditions. Some ask follow-up questions. A few are strict.

The IRS has also warned about companies that market letters as a trick to make any wellness purchase reimbursable. They are right to warn about it. A letter without a genuine medical basis does not protect you in an audit. A letter with one does its job: it documents that a licensed provider determined the expense was medically necessary for your condition.  ## The bottom line

A gym membership becomes HSA/FSA eligible when a licensed provider documents that exercise is necessary for managing your diagnosed medical condition. The letter must be specific, signed, and renewed annually, and your administrator has the final say. If you have a qualifying condition, this is a legitimate way to pay for your gym with pre-tax money, and it can save you hundreds of dollars a year.

Disclaimer: This article is for general information and is not medical, tax, or legal advice. IRS rules and administrator policies change and vary by plan. If you are reading this well after publication, confirm current rules with your HSA/FSA administrator or a tax professional.

Frequently Asked Questions (FAQs)

Adam Z. Kawalek, MD

Board-Certified Physician · Founder, MedSlip · Cedars-Sinai · Johns Hopkins

Dr. Kawalek is a board-certified internal medicine physician with 15+ years of clinical experience. He founded MedSlip to give patients fast, affordable access to the Letters of Medical Necessity that make fitness and wellness spending HSA/FSA-eligible.