What is a Letter of Medical Necessity (LMN), exactly?

A short note from a licensed clinician naming the product, the medical condition it treats, and the duration of treatment. It's a single page. Caeli's telehealth partners issue one through an intake that runs concurrently with merchant checkout — under 3 minutes from your side.

What if I get audited?

Caeli vaults your LMN, the itemized receipt, and your symptom intake together for the full 7-year IRS audit window. If your HSA administrator or the IRS asks, you forward one folder.

Does my wellness stipend (LSA) cover this?

Maybe — LSA coverage is set by your employer's plan, so it varies by person. Caeli reads your employer's LSA categories and tells you whether you can pay this way — often with no paperwork. If you have both an LSA and an HSA, Caeli steers you to spend the LSA first (it can expire) and protect the HSA (it compounds).

Does Caeli ever see my medical records?

Only the intake answers you choose to share with the telehealth clinician. Caeli itself does not store diagnoses; we store the LMN as the clinician issues it.

Shop/Sleep/Dyson Purifier Big+Quiet Formaldehyde BP03 (Nickel/Prussian Blue)

Dyson

Dyson Purifier Big+Quiet Formaldehyde BP03 (Nickel/Prussian Blue)

Name: Dyson Purifier Big+Quiet Formaldehyde BP03 (Nickel/Prussian Blue)
Brand: Dyson
Price: 929.99 USD

Covered by your benefits

How this works

HSA · with LMNFSA · with LMN

Covered by your HSA/FSA with a Letter of Medical Necessity (LMN). Caeli runs the telehealth intake during checkout — under 3 minutes.

The smart play

Multi-wallet

Spend FSA first. Put the rest on credit and shoebox it for deferred HSA reimbursement.

Spend your FSA first — it resets yearly. Cover the rest on credit and shoebox it for deferred reimbursement years later from your (still-compounding) HSA.

1. Spend FSA

2. Credit for the rest

3. Shoebox for HSA later

You keep, instead of giving to tax~$279

Caeli runs this entire play for you — picks the wallet, files the paperwork, vaults the receipt.

$929.99

Est. tax savings

~$279

Caeli runs the play above end-to-end — picks the right wallet, handles any paperwork (including the LMN), and vaults your receipts. Zero markup.

HSA/FSA card OK
Receipt auto-vaulted
No markup — direct merchant

Benefit-maxxing playbook

How to benefit-maxx anywhere you shop

Install Caeli once to benefit-maxx anywhere — from Amazon to Best Buy to dyson.com.

Your part

Two clicks. That's it.

Install Caeli in 1-click

Add the free extension. It stays silent until a benefit opportunity appears on a product you're already shopping.

Add to Chrome — it's free

Benefit-maxx on Dyson Purifier

Head to the merchant site. Tap Caeli's inline drawer at checkout to claim your savings — we handle the rest.

Shop at dyson.com

Caeli's part

The magic, behind the scenes

Instant telehealth, in-checkout

If an LMN is needed, Caeli formulates a compliant intake inside the drawer in under 3 minutes — no separate appointment, no new tab.

Credit-card → shoebox → HSA later

Pay with a credit card to stack points. Caeli auto-vaults the receipt and signed LMN so you can reimburse from your HSA decades from now — keeping the principal compounding tax-free the whole time.

Direct-from-merchant routing

Every order ships straight from the original retailer. Caeli never marks up the product — same price you'd pay without us.

HIPAA-grade privacyWorks on 10,000+ merchantsAudit-ready records

About Letters of Medical Necessity

What's an LMN, and do you qualify?

A Letter of Medical Necessity is a one-page note from a licensed clinician stating that a product treats, mitigates, or prevents a specific medical condition. The IRS accepts an LMN as the documentation that turns a “general wellness” product into a qualified medical expense — which is what unlocks HSA/FSA coverage for the Dyson Purifier Big+Quiet Formaldehyde BP03 (Nickel/Prussian Blue).

Good to know: once issued, an LMN is valid for 12 months and can be reused for any other eligible purchase tied to the same condition — not just this one product.

Here's what Caeli does for you, automatically:

Checks if you need one. Flagged before you click buy — no surprises at reimbursement time.
Gets you one in ~3 minutes. A licensed clinician reviews a quick intake right inside checkout.
Vaults it for the long haul. Stored with every receipt — ready for future HSA reimbursements and the full IRS audit window (typically 7 years).

Telehealth intake runs inline — about 3 minutes.

Want the details first? How LMNs work

Who typically qualifiesClinician-reviewed

Do any of these sound like you?

An LMN is commonly issued when a wellness product supports one of the areas below. You don't need a formal diagnosis to start — a licensed clinician reviews your intake and decides whether one applies to the Dyson Purifier Big+Quiet Formaldehyde BP03 (Nickel/Prussian Blue).

Breathing & allergies
e.g. Cough, asthma
Skin
e.g. Urticaria, Dermatitis
Bones, joints & muscles
e.g. Fibromyalgia, low back pain

Not medical advice. A licensed clinician makes the final determination based on your full intake.

Members on Caeli

“Got reimbursed $382from my HSA six months after my purchase. I'd completely forgotten about the receipt — Caeli had the LMN and the invoice ready in one click.”

Sarah K.

Caeli member · Brooklyn, NY

Across all members

$1,840: Avg. annual benefits unlocked per member
2:17: Avg. checkout time, LMN included
2,400+: Receipts vaulted for deferred reimbursement

Individual reimbursement depends on your plan and qualifying conditions.

About this product

Our quietest, most powerful air purifier. For large spaces, projects up to 32 ft.¹

Caeli's pick

Dyson's quietest, most powerful purifier is built for serious square footage, projecting clean air up to 32 feet with minimal disruption. Its three-stage HEPA H13, activated carbon, and selective catalytic oxidization filtration continuously dismantles formaldehyde and captures allergens, wildfire smoke, and odors, with discreet wheels and app control keeping daily use seamless.

Quick facts

Brand: Dyson
Category: Sleep
Concerns addressed: Allergies & Respiratory Health
IRS classification: Qualified medical expense (with an LMN)
Caeli receipt vault: Auto-saved for 7 years
Sold by: dyson.com

FAQ

What shoppers ask before they click buy

Written by Caeli's benefits team. If we haven't answered your question, the extension's in-app chat is staffed by humans.

With a Letter of Medical Necessity, yes. The IRS treats many wellness products as "general wellness" by default; an LMN from a clinician documents the medical purpose and converts the purchase into a qualified medical expense. Caeli automates the LMN flow inline during checkout.