Relating to eligibility for mediation of certain out-of-network health benefit claims.

HB 4603 requires mandatory mediation for disputes over out-of-network health care billing. It allows out-of-network providers or health benefit plan issuers to request mediation within 90 days of an initial payment for a service. The law applies only to health care services provided on or after September 1, 2025 (or an earlier date if passed with a two-thirds vote), with pre-existing services governed by prior law. This creates a structured process to resolve billing disagreements between providers and insurers without court. The bill amends the Insurance Code to establish this mediation requirement.