Yes, you can buy a humidifier using funds, but it generally requires a Letter of Medical Necessity (LMN) from a licensed healthcare provider. Because the IRS views humidifiers as "dual-purpose" items—capable of providing both general comfort and medical treatment—you must document that the device is being used specifically to treat a diagnosed medical condition. Humidifiers and FSA Eligibility: A Healthcare Investment

Some modern brands, such as Canopy and Carepod , partner with services like Truemed to help customers obtain an LMN through a brief health intake form during checkout.

FSA-eligible humidifiers from brands like Vicks , Honeywell , and Levoit can be found at specialized stores like the FSA Store or major retailers such as CVS , Walmart , and Amazon .

Crucially, the LMN must be dated before the purchase; you cannot typically seek retroactive reimbursement for a device bought before the letter was issued.

Various types of humidifiers are eligible across major retailers, provided the documentation is in place.

Once a humidifier is deemed eligible, related accessories like replacement filters and wicks also become FSA-reimbursable expenses. Choosing and Purchasing the Right Device