The purpose of the expense matters
HSA means health savings account; FSA means health flexible spending arrangement. Both can pay qualifying medical expenses. The September 2026 tax review draws a key line for weight costs. The purpose must be to treat a specific disease that a physician has diagnosed.
That is a more precise question than whether a service accepts an account card. Ask the person who runs the account which records to provide for this charge. Ask the care service for an itemized description of what is being charged and how it relates to the planned treatment.
The IRS distinguishes treatment of a diagnosed disease from an expense that only benefits general health. Its published guidance includes weight-loss costs when the purpose is treatment of a diagnosed disease such as obesity.
IRS means the Internal Revenue Service. Its general rule does not settle every charge inside a program. Ask about the actual item, rather than applying the medical purpose of a prescription to everything listed in the same package.
| Item | Record to discuss |
|---|---|
| Medicine | The itemized expense and treatment purpose. |
| Care service | The service description and documentation requested. |
| Other items | A separate answer about each bundled extra. |
Ask what documentation the account requires
The person running a spending account can still require a “letter of medical necessity” to support the expense. That phrase did not appear in the IRS materials checked in September 2026.
In that letter, the doctor or other treating professional explains why an item is medically needed. Ask the administrator what it wants the letter to address. Ask the care service whether producing the requested records is included in its fee. Keep that answer with the terms of the offer.
The September 2026 IRS review says a health FSA expense needs supporting records. These describe the item or service, its date and the amount paid. The term for this proof is substantiation.
Separate medicine, service and extras
Ask for a bill that names the review, ongoing service, medicine and any other items separately. Keep the description of each charge. If the program bundles items, ask how the administrator wants that expense documented rather than guessing how to divide it.
Avoid assuming that an account’s acceptance of a payment ends the recordkeeping task. Ask what documentation to retain and where to send it if requested. Keep private records in a place intended for them, rather than in a general question list.
A bundled device has its own test
The IRS added wearable-device guidance in September 2026. Tracking health data alone did not make a device a qualifying expense. For a device with mixed uses, the main purpose of its purchase and use had to be treating or finding a specific disease.
A wearable means a device such as a watch, ring or sensor worn on the body. If an offer includes one, ask the administrator about that item directly. Do the same for any related subscription instead of assuming the whole bundle follows the prescription’s treatment purpose.
Take the itemized offer to the administrator and request an answer for the expense under consideration. The useful answer is a clear list of qualifying charges and the records needed to support them.