Is a smart ring HSA or FSA eligible? What each brand says

What each brand says

Here's each brand's own statement, word for word where we have it, with the route it documents and what it says about a letter of medical necessity (LMN). We only list what we could read on the brand's or its checkout partner's page.

Two things stand out. First, “eligible” on a product page is the seller's statement, not your plan's decision. Second, two of these brands route payment through Flex, a checkout service that adds a short medical screening, and Flex lists Oura too. Neither is a problem, but both are worth understanding before you spend account money. The rest of our no-subscription hub covers what each ring costs to own once it's paid for.

The IRS rule behind the badges

The IRS defines medical expenses as “the costs of diagnosis, cure, mitigation, treatment, or prevention of disease, and for the purpose of affecting any part or function of the body.” It adds that they “must be primarily to alleviate or prevent a physical or mental disability or illness” and “don't include expenses that are merely beneficial to general health” ( IRS). The IRS page we checked, last reviewed January 15, 2026, doesn't mention wearables at all.

That's the tension. A sleep and recovery ring sold for general wellness is exactly the kind of purchase that could count as “merely beneficial to general health.” In practice, the gap gets closed one of two ways: your plan accepts the purchase as it is, or a clinician writes a letter of medical necessity linking it to a condition you have. Oura's own blog says of the letter: “Most providers don't require it, but some may” (Oura).

How the Flex letter works

Flex is the checkout partner RingConn and Ultrahuman name, and it lists Oura as well. Its product pages say: “All products shown in the Flex Marketplace are HSA/FSA eligible, some may require a Letter of Medical Necessity (LMN).” Here's the process as Flex describes it (Flex):

1. You pick Flex at checkout and are taken to “a chat-based consultation with a healthcare practitioner.” You answer the questions as prompted.
2. A clinician decides. “A licensed clinician will determine your eligibility during a chat-based telehealth consultation.” Flex says “you must have a medical condition that warrants the product or service you intend to purchase using your HSA/FSA,” and lists qualifying categories as “cardiovascular, metabolic, musculoskeletal, autoimmune, neurological, or mental health.”
3. The letter arrives by email. “You'll get the Letter of Medical Necessity in your inbox within 24 hours.”
4. You keep it. The letter is “valid for 12 months from the date of issue,” and Flex says to keep it “on file for at least three years in the event of an IRS audit.”

We didn't find what the consultation costs on the Flex pages we checked, so ask before you start. For Oura specifically, Flex says: “Generally, you do not need a Letter of Medical Necessity (LMN) for an Oura Ring; however, some plans may require you to get one” ( Flex).

One more thing: a Flex consultation means describing a health condition to a company other than the ring maker. That's how a letter of medical necessity works, and it may well be worth it for the tax saving, but if data control is part of why you want a ring, read our smart ring data privacy guide too.

Paying for a membership with HSA or FSA

This is where pre-tax money changes the fee math. Oura says “Oura Ring and Membership are covered and reimbursable via Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA),” and its support page says a prepaid membership can be paid with HSA or FSA funds when you buy it with a new ring. The membership is $69.99 a year, so three years on the annual plan comes to $209.97. Paying that with pre-tax dollars makes it cheaper in real terms, though it's still a fee that runs as long as you use the ring.

The no-fee rings have nothing to reimburse after the ring itself. Ultrahuman is a middle case: its HSA/FSA page also lists its optional Cycle & Ovulation Pro PowerPlug. For the whole-life cost of each ring, see our Oura membership cost guide and the three-year cost breakdown.

How to pay for a ring with HSA or FSA

1. Ask your plan administrator first. Ask whether they reimburse a wearable, whether they need a letter of medical necessity, and whether they expect you to pay with the account card or claim afterward with a receipt.
2. Size before you spend. Get your size confirmed with the brand's kit before you put account money on the ring. Our sizing guide explains why your jewelry size won't do.
3. Buy through the route the brand documents. Oura documents its own store; RingConn and Ultrahuman document Flex. We didn't verify whether buying the same ring on Amazon qualifies, so confirm with your administrator before you use the account card there.
4. Keep the paperwork. Save the receipt and, if you got one, the letter. Flex says to keep it for at least three years.
5. Watch the date on the letter. Flex says its letter is valid for 12 months from issue.

Picking a ring with pre-tax money

Pre-tax money doesn't change what makes a ring good. Check the required fee, your phone, your size and the published evidence first, then check the HSA/FSA route. On that basis, these rings pair a clear HSA/FSA statement with the rest of what we look for. Scores come from our published rubric.

Ultrahuman Ring PRO and Circular Ring 2 also carry HSA/FSA statements. Both are sold only from their brands' own stores, which is where you'd use the account anyway; see our Ultrahuman Ring PRO review and Circular Ring 2 review. If you're still choosing a ring, start with the best smart rings without a subscription or the smart ring comparison chart.

HSA and FSA mistakes

• Reading “eligible” as guaranteed. The badge is the seller's statement. Your plan decides.
• Skipping a letter your plan needs. If your administrator wants a letter of medical necessity, get it before you buy, not after a claim is denied.
• Paying a membership post-tax by habit. If you pay Oura's membership from a regular card, you may be paying post-tax for something Oura says is reimbursable.
• Assuming every store counts. The brands document their own store or Flex. Check before using the account card anywhere else.
• Treating the ring as a medical device because medical money paid for it. HSA eligibility doesn't make a ring diagnostic. RingConn, for one, says Gen 3 is “not a medical device.”