Amends the Illinois Insurance Code. Provides that a group or individual policy of accident and health insurance or a managed care plan that is amended, delivered, issued, or renewed on or after January 1, 2028 that provides coverage for: habilitative services shall provide coverage for habilitative speech therapy as a treatment for stuttering, regardless of whether the stuttering is classified as developmental; rehabilitative services shall provide coverage for rehabilitative speech therapy as a treatment for stuttering; or both habilitative services and rehabilitative services shall provide coverage for habilitative speech therapy as a treatment for stuttering, regardless of whether the stuttering is classified as developmental, and shall provide coverage for rehabilitative speech therapy as a treatment for stuttering. Sets forth requirements and limitations for the coverage. Amends the State Employees Group Insurance Act of 1971, the Counties Code, the Illinois Municipal Code, the School Code, the Health Maintenance Organization Act, the Limited Health Service Organization Act, the Voluntary Health Services Plans Act, and the Illinois Public Aid Code to require coverage under the provisions of those Acts. Amends the State Mandates Act to require implementation without reimbursement. Effective January 1, 2028.