Letter of Medical Necessity for a Mattress + Free Template

Short answer: You usually can use HSA or FSA funds toward a mattress — but not automatically. A plain mattress is not an eligible expense on its own. It can become eligible when a licensed healthcare provider writes a letter of medical necessity (LMN) stating that the mattress is needed to treat a diagnosed medical condition (such as chronic back pain or arthritis). You then either pay with your HSA/FSA card or submit the LMN with your receipt for reimbursement. Your plan administrator has the final say, so confirm before you buy.

What a letter of medical necessity actually is

A letter of medical necessity is a signed document from a licensed provider — a physician, osteopath, or chiropractor — explaining why a product or service is necessary to treat, prevent, or manage a diagnosed condition. For a mattress, the letter connects a specific medical problem to a specific sleep-surface need.

It’s the document that turns “a mattress is a personal expense” into “a mattress is a qualified medical expense” in the eyes of most HSA/FSA administrators. Without it, mattress purchases are normally rejected.

When does a mattress qualify?

A mattress is far more likely to qualify when all of these are true:

• You have a diagnosed condition that sleep affects — for example chronic lower-back pain, arthritis, sciatica, a spinal injury, or a similar issue.
• A licensed provider recommends a specific type of mattress (e.g. firm/orthopedic support, pressure relief, or an adjustable base) as part of your treatment.
• The recommendation is condition-specific — “needs medium-firm orthopedic support for diagnosed lumbar disc degeneration,” not “would sleep better on a nicer bed.”

A few honest caveats worth knowing up front:

• Standard comfort upgrades don’t qualify. Wanting a more comfortable or cooler bed isn’t a medical reason on its own.
• Some administrators reimburse only the difference between a standard mattress and the medically necessary one — not the whole price.
• The letter is usually dated and time-limited (commonly ~12 months), and it generally needs to exist before or around the purchase, not be invented afterward.

How the HSA/FSA process works, step by step

1. Talk to your provider. Bring up your diagnosed condition and ask whether a specific mattress is part of managing it. If yes, request a letter of medical necessity.
2. Get the letter written with the required details (see the template below). Your own doctor can write it, or some mattress retailers offer an online health-survey service (such as Truemed) where a licensed provider reviews your answers and issues the LMN — often within a day or two.
3. Check your plan rules. Call or message your HSA/FSA administrator and confirm what they require (LMN, itemized receipt, claim form) and whether they cover the full price or only the difference.
4. Buy the mattress and keep the itemized receipt showing the product, price, and date.
5. Pay or get reimbursed. Either pay directly with your HSA/FSA debit card, or submit the LMN + receipt + any claim form for reimbursement.
6. Keep copies of everything (letter, receipt, claim) with your tax records in case the expense is ever reviewed.

Free letter of medical necessity template (copy & paste)

Below is a generic sample you can give your provider as a starting point. It is not legal or medical advice — your provider should adapt it to your actual diagnosis and judgment, and you should confirm the required format with your HSA/FSA administrator.

[Provider / Clinic letterhead]

Date: [MM/DD/YYYY]

To Whom It May Concern / [HSA or FSA Administrator Name]:

RE: Letter of Medical Necessity for [Patient Full Name], DOB [MM/DD/YYYY]

I am the treating [physician / osteopath / chiropractor] for the above-named
patient. Based on my clinical evaluation, the patient has been diagnosed with
[diagnosed condition, e.g. chronic lumbar back pain] [ICD-10 code: ____].

As part of the treatment and management of this condition, I recommend that the
patient use a [describe medically necessary features — e.g. medium-firm
orthopedic-support / pressure-relieving / adjustable] mattress. This specific
sleep surface is medically necessary to [explain clinical benefit — e.g.
maintain spinal alignment, reduce pressure on affected joints, and prevent
worsening of symptoms]. A standard mattress does not adequately address the
patient's diagnosed condition.

I anticipate the patient will require this for [duration, e.g. 12 months /
ongoing]. Please consider this purchase a qualified medical expense.

If you have any questions, I can be reached at the contact information below.

Sincerely,

[Provider Name, Credentials]
License #: [__________]
Clinic / Practice: [__________]
Phone / Email: [__________]
[Signature]

Sample only — confirm with your provider and administrator. Don’t alter the clinical content yourself; the diagnosis, recommendation, and justification must be your provider’s own professional judgment.

What the letter must include

To satisfy most HSA/FSA administrators, the letter should contain:

• Patient info — full name and date of birth.
• Provider info — name, credentials, license number, contact details, and signature.
• Diagnosis — the specific condition, often with its ICD-10 code.
• Recommendation — the specific mattress features being prescribed (support level, pressure relief, adjustable base, etc.).
• Clinical justification — how that mattress treats, prevents, or manages the condition.
• Duration — how long the item is needed.

Affordable, supportive mattresses to consider

If your provider recommends a supportive or pressure-relieving mattress, you don’t have to spend a fortune — supportive budget models exist. Confirm eligibility first, then compare options. (We may earn a commission if you buy through the links below, at no cost to you — it never affects our recommendations.)

Want the full shortlist? See our Best Budget Mattresses 2026 rankings, our picks for back pain on a budget, and the budget mattress buying guide. For the wider market, see our 2026 budget mattress data study.

Related HSA/FSA guides

The same letter-of-medical-necessity process applies to other home-health purchases. See our companion guides: letter of medical necessity for an air purifier (asthma & allergies) and letter of medical necessity for a humidifier (sinus & dry-air conditions).