HSA and FSA money for radon fixes, monitors, and air purifiers

Publication 502

IRS, Publication 502 (2025), Medical and Dental Expenses. Page Last Reviewed or Updated: 30-Apr-2026

• "Medical expenses are the costs of diagnosis, cure, mitigation, treatment, or prevention of disease and for the purpose of affecting any part or function of the body. These expenses include payments for legal medical services rendered by physicians, surgeons, dentists, and other medical practitioners. They include the costs of equipment, supplies, and diagnostic devices needed for these purposes."¹
• "Medical care expenses must be primarily to alleviate or prevent a physical or mental disability or illness. They don’t include expenses that are merely beneficial to general health, such as vitamins or a vacation."¹
• "You can include in medical expenses amounts you pay for special equipment installed in a home or for improvements if their main purpose is medical care for you, your spouse, or your dependent. The cost of permanent improvements that increase the value of your property may be partly included as a medical expense. The cost of the improvement is reduced by the increase in the value of your property. The difference is a medical expense. If the value of your property isn’t increased by the improvement, the entire cost is included as a medical expense."¹
• "You can’t include in medical expenses amounts for which you are fully reimbursed by your flexible spending arrangement if you contribute a part of your income on a pre-tax basis to pay for the qualified benefit."¹
• "You can’t include in medical expenses amounts you contribute to a health savings account. You can’t include expenses you pay for with a tax-free distribution from your health savings account."¹

Publication 969

IRS, Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans. Page Last Reviewed or Updated: 30-Apr-2026

• "Distributions from an HSA that are used to pay qualified medical expenses aren’t taxed."²
• "Reimbursements from an FSA that are used to pay qualified medical expenses aren’t taxed."²
• "Health FSAs are employer-established benefit plans. These may be offered in conjunction with other employer-provided benefits as part of a cafeteria plan. Employers have flexibility to offer various combinations of benefits in designing their plans.
  Self-employed persons aren’t eligible for FSAs."²
• "You must provide the health FSA with a written statement from an independent third party stating that the medical expense has been incurred and the amount of the expense. You must also provide a written statement that the expense hasn’t been paid or reimbursed under any other health plan coverage."²

Information letter 2013-0011

Of the IRS documents checked on October 5, 2026, only information letter 2013-0011, dated February 20, 2013, discusses radon.

IRS Office of Chief Counsel, Information Letter 2013-0011, February 20, 2013 (PDF)

• "In particular, you ask whether indoor radon testing and mitigation costs are expenses for medical care under § 213(d) of the Internal Revenue Code and therefore are eligible for reimbursement under health savings accounts and flexible savings arrangements."³
• "While we understand the importance of residential radon testing, abatement, and mitigation, we do not currently have a published position that treats radon testing and mitigation costs as medical care under § 213(d)."³
• "However, we plan to address this issue in proposed regulations under § 213."³

Airthings' HSA and FSA page

Shop HSA & FSA Eligible Products

• "Airthings radon detectors, indoor air quality monitors, and the Renew air purifier are potentially eligible for HSA and FSA reimbursement in the US with a Letter of Medical Necessity (LMN) from Truemed."⁴
• "On the order confirmation page, you'll see a link to Truemed, our reimbursement partner. You complete a short health survey, and if approved, Truemed issues a Letter of Medical Necessity (LMN). You then submit your Airthings receipt and the LMN to your HSA or FSA provider, who reimburses you from your pre-tax balance."⁴

Airthings Help Center

Using HSA or FSA Funds - Truemed reimbursement, May 28, 2026

• "For certain purchases like radon and air quality monitors, your plan administrator may require a Letter of Medical Necessity (LMN) to approve the reimbursement claim."⁵
• "The LMN is issued exclusively by Truemed through their independent eligibility process. Airthings is not able to provide, sign, or supplement an LMN on your behalf."⁵
• "Truemed issues an LMN when you meet their eligibility criteria, but whether your claim is approved depends on your HSA or FSA administrator and your specific plan rules. Reimbursement policies vary between providers and employers. Neither Airthings nor Truemed can guarantee that your claim will be approved."⁵
• "The Truemed reimbursement option is available exclusively on the Airthings store in the United States, and for eligible products."⁵

North Carolina

North Carolina Department of Health and Human Services, North Carolina Radon Program

• "If a medical professional recommends radon mitigation due to it causing a medical condition from being in a home, the cost of mitigation is eligible with a Letter of Medical Necessity and eligible for reimbursement with a flexible spending account, health savings account or a health reimbursement arrangement."⁶
• "Radon mitigation reimbursement is not eligible with a limited-purpose flexible spending account or a dependent care flexible spending account."⁶

Vermont

Vermont Department of Health, Financial Assistance. Last Updated: January 29, 2026

"You may be able to use funds from a flexible spending account (FSA), health savings account (HSA) or a health reimbursement arrangement (HRA) if:"⁷

• "A medical professional recommends addressing radon, lead or mold in your home because radon in your it is causing a medical condition."⁷
• "A Letter of Medical Necessity (LMN) is provided."⁷

A guide on state health department sites

The Conference of Radiation Control Program Directors' guide for health care providers (PDF), posted by the Florida, Arkansas, and Connecticut health departments; quoted from the Florida copy.

• "In addition, radon reduction costs often are an eligible expense covered under a health flexible spending arrangement (FSA)."⁸