ResourcesEligible Expense List >>Claim & Debit Card Substantiation Documentation Checklist >>FREQUENTLY ASKED QUESTIONS> (opens in a new tab)”>Frequently Asked Questions: Orthodontics and FSAs >>> (opens in a new tab)”>Frequently Asked Questions: Premium Only Plans >>HELPFUL LINKS> (opens in a new tab)”>IIAS Eligible Provider List >>> (opens in a new tab)”>IIAS Participant Merchant List (For Peak One Debit Card users) >>> (opens in a new tab)”>IRS >>