The Health DATA Act of 2026 would amend federal employee benefits law to give employers and other sponsors of workplace health plans full access to the detailed claims, pricing, and billing data held by insurance companies, third-party administrators, pharmacy benefit managers, and other vendors that manage their health plans. Currently, many of these vendors restrict or delay employers' ability to see how health claims are priced, processed, and paid, making it hard for companies to audit costs or spot overcharges. Under this bill, contracts between health plans and these service providers could no longer limit access to claims data, pricing formulas, overpayment information, or audit rights, and data would generally have to be shared within 15 days in standardized, HIPAA-compliant electronic formats at no extra cost. Vendors that violate these rules could face civil penalties of up to $10,000 per day from the Department of Labor, and contract clauses that try to block this data access or shield vendors from penalties would be voided. The changes would take effect for plan years beginning at least one year after the law is enacted, affecting employers, insurers, and administrators involved in group health plans nationwide.