First published: January 29, 2026 / Last updated: February 27, 2026

What makes an expense HSA eligible?

HSA eligibility is determined by IRS rules, not retailers, influencers, or how a product is marketed. Understanding why an expense qualifies is the key to using your HSA correctly and avoiding reimbursement issues.

This guide explains the IRS framework used to determine whether a product or service is HSA eligible, including how medical purpose, documentation, and dual-purpose use affect eligibility.

The IRS definition of an eligible medical expense

The IRS defines eligible medical expenses as costs incurred for the diagnosis, cure, mitigation, treatment, or prevention of disease, or for affecting any structure or function of the body.

The three categories of HSA expenses

Always eligible expenses

These expenses clearly meet the IRS definition of medical care and do not require additional documentation.

• Doctor visits and hospital services
• Prescription medications
• Over-the-counter medications (no prescription required)
• Menstrual care products
• Dental and vision care
• Medical tests and lab work
• Durable medical equipment
• Sunscreen (SPF 15+)

OTC medications and menstrual products are HSA-eligible without a prescription under the CARES Act rules.

Conditionally eligible expenses

Some items have both medical and personal uses. These are often called dual-purpose expenses. They are only HSA eligible when there is a documented medical need.

• Massage therapy
• Acupuncture or acupressure products
• Orthopedic shoes
• Humidifiers or air purifiers
• Therapeutic or recovery devices marketed for general wellness

In these cases, a letter of medical necessity (LMN) is often required to show that the medical purpose outweighs personal preference.

Some administrators also ask for provider identifiers (such as an NPI or license number) on the LMN, especially for higher-cost or recurring expenses.

Never eligible personal expenses

Expenses that are primarily cosmetic, general wellness, or personal comfort do not qualify, even if they may have indirect health benefits.

• Cosmetic procedures without a medical purpose
• General fitness equipment
• Vitamins and supplements (unless prescribed to treat a specific condition)
• Personal hygiene products

Quick eligibility check

Documentation matters

Even eligible expenses can be denied if documentation is insufficient. A good receipt should include:

• Date of purchase or service
• Merchant or provider name
• Clear description of the product or service
• Amount paid

Sources

• Publication 502 - IRS
• Publication 969 - IRS
• CARES Act (Section 3702) - Congress.gov

Disclaimer

This page is for educational purposes only and is not tax or legal advice. Check with your HSA administrator or a qualified tax or legal professional if you have questions about your specific situation.