IRS Compliance Checklist for Merchants: HSA/FSA Product & Documentation Rules

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What Counts as an Eligible Medical Expense

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IRS Publication 502 defines what qualifies as a medical expense for HSA and FSA reimbursement. An expense must be primarily for the prevention or treatment of a medical condition, not cosmetic in nature, and not considered a general wellness product unless tied to a diagnosis or recommendation.

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This distinction explains why some products, like crutches or contact lenses, are automatically eligible, while others, like supplements or ergonomic furniture, often require a Letter of Medical Necessity (LMN).

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Examples of Eligible Categories

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• Automatically eligible: Bandages, prescription medications, insulin, contact lenses, blood pressure monitors, and menstrual products.
• Eligible with LMN: Supplements such as vitamin D for deficiencies, ergonomic chairs for chronic back pain, massage guns for muscle recovery, and therapy subscriptions for anxiety or stress.
• Not eligible: Cosmetic procedures, wrinkle creams, general gym memberships, or protein shakes without a documented medical purpose.

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The Role of the LMN

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A Letter of Medical Necessity is a document written by a licensed healthcare provider that confirms a product is required for a patient’s condition. The LMN spells out the diagnosis, the recommended product, and the medical reason for the purchase.

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Plan administrators rely on LMNs when evaluating reimbursement claims. Without a properly written LMN, even legitimate purchases may be denied. For merchants, understanding this process is essential because it determines whether their products can be safely marketed as HSA/FSA-eligible.

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Documentation Requirements for Merchants

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Compliance is not just about the product. Merchants play a role in providing receipts and information that align with IRS standards. At a minimum:

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• Itemized receipts should include the product name, date, and price.
• Clear labeling of eligible items reduces confusion and cart abandonment.
• Audit trail support ensures purchases can be validated if challenged.

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Merchants are not required to manage medical files directly, but they must make it possible for customers to use proper documentation.

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What Auditors Look For

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IRS audits of HSA/FSA transactions are not everyday events, but they happen. Plan administrators and employers also perform periodic checks. They look for:

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• Purchases that are obviously cosmetic or general use.
• LMNs that are vague, copied, or clearly template-generated.
• Missing receipts or unclear product labeling.

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When problems arise, it is usually the merchant’s brand that takes the reputational hit, even if the technical liability rests elsewhere.

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Avoiding Common Pitfalls

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Merchants sometimes trust third-party processors that cut corners. Red flags include:

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• Auto-generated LMNs that do not involve real providers.
• Systems that require customers to waive HIPAA rights.
• Marketing cosmetic or dual-use products as eligible without documentation.

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These shortcuts create audit exposure. Merchants that rely on them may win short-term sales but risk long-term brand damage.

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Why Compliance Protects Growth

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Compliance is not simply a legal safeguard. It builds customer trust. Shoppers who know a brand handles eligibility properly are more likely to spend confidently with pre-tax dollars. That confidence leads to larger cart sizes, more repeat purchases, and a stronger competitive position in the market.