Amends the Illinois Insurance Code. Provides that any group or individual policy of accident and health insurance or managed care plan amended, delivered, issued, or renewed on or after January 1, 2026 shall offer all reasonably available methods of payment from the insurer or managed care plan, or its contracted vendor, to the contracted health care provider. Provides that an insurer or managed care plan shall not mandate payment by credit card. Provides that if one of the available payment methods has a fee associated with it, the insurer or managed care plan, or its contracted vendor, shall notify the health care provider of certain information and provide the health care provider with instructions on how to select each method. Provides that if a health care provider requests a change in the available payment method, the insurer or managed care plan, or its contracted vendor, shall implement the change to the payment method selected by the health care provider within 30 business days, subject to federal and State verification measures to prevent fraud and abuse. Provides that an insurer or managed care plan shall not use a health care provider's preferred method of payment as a factor when deciding whether to provide credentials to a health care provider. Defines terms. Amends the Health Maintenance Organization Act to make a conforming change.