Introduction

Getting a Letter of Medical Necessity used to mean booking a doctor’s appointment, taking time off work, and paying a copay—all before you even knew if you’d qualify. Online LMN providers have changed the game. This guide walks through exactly how to get your LMN online, what to expect, and how to choose the right provider.

The Traditional Way (And Why It’s Painful)

The old-school process for getting an LMN involved calling your doctor’s office to schedule an appointment, waiting days or weeks for availability, paying your copay or out-of-pocket visit fee, explaining what an LMN is (many primary care doctors aren’t familiar with the process), hoping your doctor agrees to write one, waiting for them to draft and send the letter, and then submitting it to your FSA/HSA administrator yourself. This process could take weeks, and many people gave up or never received a properly formatted LMN that their administrator would accept.

The Online Process: How It Works in 2026

Online LMN providers use telehealth to connect you with licensed providers who specialize in medical necessity documentation. Here’s what a typical process looks like:

• Step 1 – Complete a Health Assessment: You’ll answer questions about your medical history, current conditions, and the product or service you want to use your FSA/HSA funds for.

• Step 2 – Provider Review: A licensed healthcare provider reviews your assessment and determines whether medical necessity can be established for your purchase.

• Step 3 – LMN Issuance: If you qualify, the provider issues a formal Letter of Medical Necessity that meets FSA/HSA administrator requirements.

• Step 4 – Reimbursement: You submit the LMN to your administrator (or, with Burst, we handle the reimbursement for you).

How Burst Is Different

Most online LMN providers stop at step 3: they hand you a letter and leave you to figure out the reimbursement process yourself. Burst takes a fundamentally different approach.

With Burst, you buy the product you want with any payment method—your regular credit card, debit card, or Apple Pay. No need to find a store that accepts FSA/HSA cards. After your purchase, Burst’s platform verifies your eligibility, coordinates the LMN through a licensed provider, and processes the reimbursement directly to your bank account. You get your pre-tax savings without ever touching your FSA/HSA card.

What to Look for in an Online LMN Provider

• Licensed providers: Ensure the platform uses MDs, DOs, NPs, or PAs licensed in your state.

• Turnaround time: Look for 12–24 hour delivery. Anything longer than a week is a red flag.

• Acceptance rate: Ask about their LMN acceptance rate with major FSA/HSA administrators.

• Reimbursement support: Does the provider help you actually get reimbursed, or just hand you a letter?

• Transparent pricing: No hidden fees or surprise charges.

Frequently Asked Questions

Is an online LMN legitimate? Yes. As long as the LMN is issued by a licensed healthcare provider after a legitimate clinical evaluation, it’s fully valid for FSA/HSA reimbursement purposes.

How much does an online LMN cost? Costs vary by provider. With Burst, there’s no upfront fee for the LMN—our fee is built into the reimbursement process.

What if I don’t qualify? If a provider determines that medical necessity cannot be established, you won’t be charged for an LMN you can’t use.