Letter of Medical Necessity for Food: How It Works for Meals

LMN for Food: What It Covers for HSA and FSA Meals

A Letter of Medical Necessity (LMN) for food is a clinician’s written documentation that a specific diet supports the management of a diagnosed health condition. For meals, it can let you put Health Savings Account (HSA) or Flexible Spending Account (FSA) funds toward the eligible portion of the cost, not the full price. The letter supports your claim, but it does not make ordinary food eligible on its own. Here’s what an LMN for meals covers, who makes each decision, and how the review works when you order prepared meals.

Key takeaways

• An LMN documents a clinician’s view that certain food is medically necessary for you. It is one piece of the IRS food test, not the whole test.

• Even with an LMN, only the cost above ordinary food can be paid with HSA or FSA funds.

• Four parties shape the outcome. The IRS sets the rules, a clinician reviews your health needs, the meal service classifies its menu, and your plan administrator has the final word.

• In CookUnity’s HSA/FSA experience, the clinician review is built into ordering, so you don’t need to bring your own letter.

• An LMN through Truemed lasts 12 months, and you don’t need a new review each time you order different meals.

What Is a Letter of Medical Necessity for Food?

An LMN is a document from a licensed clinician explaining why a purchase is medically necessary for you. Letters are common for expenses that aren’t obviously medical, like fitness equipment, supplements and food.

Food needs extra documentation because most of what we eat covers everyday nutrition, which the IRS does not treat as a medical expense. A letter of medical necessity for meals connects the food to a specific health need, so your plan administrator can see why the purchase may qualify.

When Does Food Need a Letter of Medical Necessity?

Food or beverages count as a medical expense only when they pass all three parts of the IRS test. According to the IRS FAQs on nutrition and general health expenses:

1. The food does not satisfy normal nutritional needs.

2. The food alleviates or treats an illness, in the IRS’s words.

3. A physician substantiates the need for it.

The LMN addresses the third condition. It can’t satisfy the first two, so a letter alone doesn’t make general healthy eating an eligible expense. The IRS also says expenses that are merely beneficial to general health don’t count. We walk through each condition in our guide to whether you can buy food with an HSA.

What Does an LMN for Meals Document?

Requirements vary by plan administrator, but a letter of medical necessity for food generally covers:

1. Your diagnosed condition. The health need the food is meant to support.

2. The recommended diet. The type of food or eating pattern the clinician considers necessary, such as meals that fit a diabetes or heart health plan.

3. The connection between the two. Why that food matters for your condition, beyond general wellness.

4. The clinician’s details. Name, credentials and signature.

5. The time frame. When the recommendation starts and how long it applies.

If your administrator asks for documentation, they usually want a letter like this plus itemized receipts.

Who Decides if Your Meals Qualify?

No single party approves a meal on its own. Each one answers a different question:

That’s why an “HSA/FSA eligible” label on a menu doesn’t settle the question. A meal can be classified as potentially eligible and still not apply to you if your review doesn’t cover it.

Does an LMN Make Your Whole Meal Order Eligible?

No. Even for a meal your LMN covers, the IRS limits the medical expense to the amount above the cost of ordinary food. In practice, part of every meal goes on a personal card, and only the eligible portion goes on your HSA or FSA card.

Meals outside your approved needs are charged in full to your personal card. Your checkout should show how each meal is split, so you know what your benefits card pays before you confirm.

How Does the LMN Review Work for CookUnity Meals?

CookUnity is the first meal delivery led by world-class chefs, and qualified customers can use pre-tax dollars toward eligible meal costs. The review runs through Truemed, a health payments company that works with independent licensed clinicians. It happens inside a separate HSA/FSA ordering experience, not regular cookunity.com checkout.

1. Start at the CookUnity HSA/FSA page. See how CookUnity’s HSA/FSA ordering works and begin there.

2. Complete the health questionnaire. It covers your health history, eating needs and allergies. You also add your HSA/FSA card and a personal card.

3. Wait for the clinician review. A licensed clinician reviews your answers and decides whether to issue an LMN. Submitting the questionnaire is not approval, and review time varies, so plan extra lead time for your first order.

4. Build your order. Once you’re approved, eligible meals are labeled in your account based on your health needs.

5. Check the breakdown. Your checkout shows what your HSA/FSA card pays and what your personal card pays.

The review looks at your overall health needs rather than one basket, so it covers the medically tailored meals that match them. CookUnity organizes meals around needs such as diabetes-friendly eating, heart health and weight management. A category alone doesn’t decide what qualifies for you. Your clinician review and each meal’s classification do. For a full walkthrough of ordering, see our guide to using HSA or FSA for meal delivery.

What Happens if You’re Not Approved?

You can still order CookUnity meals, and they’re charged to your personal card. If your circumstances change, you can retake the questionnaire without entering your cards again.

How Long Does a Letter of Medical Necessity Last?

An LMN issued through Truemed is valid for 12 months. You can start the renewal review within 30 days of the expiration date. If your LMN lapses, your orders still go through, but they’re charged to your personal card until a new letter is in place. Keep track of your expiration date, since you may not get a reminder.

Do You Need a New LMN for Different Meals?

No. Choosing different meals, trying a meal you haven’t ordered before, or skipping a week doesn’t require a new review. A meal outside your approved needs is simply charged to your personal card.

Do You Need Your Own Letter From Your Doctor?

Not for CookUnity’s HSA/FSA experience. The clinician review is part of the ordering flow, so you don’t need to request a letter from your own doctor first.

Other meal services and administrators work differently. Some ask you to supply a letter yourself, and some plans have their own forms. If you plan to submit a claim on your own, ask your administrator what documentation they accept before you order.

Can You Use a Letter of Medical Necessity With an FSA?

Yes. The IRS guidance applies to HSAs and FSAs alike, so the same food test and LMN rules apply to both. Because an FSA is offered through your employer, your plan may add its own documentation rules and year-end deadlines. Check those before you order.

Some employers also offer wellness stipends that can go toward meals, and some health plans and healthcare providers offer meals as a member or patient benefit. Those programs have their own rules, separate from HSA and FSA eligibility.

What Should You Keep for Your Records?

Hold on to these in case your administrator asks:

1. Your Letter of Medical Necessity and its expiration date.

2. Itemized receipts for each order.

3. The payment breakdown showing what went on each card.

4. Notes on the health need behind your meals and any related care plan.

5. Any messages with your plan administrator about meal purchases.

Eligibility and tax savings vary by person. For tax or plan-specific questions, talk with your benefits administrator or a tax professional.

Data note: The food rules come from the IRS FAQs on nutrition, wellness and general health (last reviewed Sept. 23, 2026). LMN validity and renewal details come from Truemed’s published documentation for medically tailored meal partners. The ordering steps come from CookUnity’s HSA/FSA page. Rules and process details can change, so confirm current information before you order.

Frequently Asked Questions

What is a letter of medical necessity for food?

It’s a clinician’s written documentation that a specific diet supports the management of your diagnosed condition. It helps show your plan administrator why a food purchase may count as a medical expense.

Does a letter of medical necessity make all food HSA eligible?

No. The food still has to go beyond normal nutritional needs and relate to an illness. Only the cost above ordinary food can be paid with HSA or FSA funds.

Who can write a letter of medical necessity for meals?

The IRS food rule calls for a physician to substantiate the need. In CookUnity’s HSA/FSA experience, an independent licensed clinician working with Truemed reviews your questionnaire and decides whether to issue the letter. If you submit claims yourself, your administrator can tell you which credentials they accept.

How long is a letter of medical necessity valid?

An LMN issued through Truemed is valid for 12 months, and renewal can start within 30 days of expiration. Letters from other sources may cover different time frames.

Do I need a new letter every time I order meals?

No. One approval covers your orders until it expires, even when you choose different meals each week.

What happens if my letter of medical necessity is denied?

You can still order CookUnity meals with your personal card. You can also retake the questionnaire later if your health needs change.

Ready to See if Your Meals Qualify?

The fastest way to know is to complete the review. Start your HSA/FSA meal order and see which meals from award-winning chefs fit your needs. Clinician approval is required, and eligibility and tax savings vary.