This subchapter applies to a health benefit plan issuer that enters into or renews a contract with a participating provider on or after January 31, 2006. The provisions of Insurance Code §1274.002 and this subchapter are not applicable to Medicaid and Children's Health Insurance Program (CHIP) plans provided by a health benefit plan issuer to persons enrolled in the medical assistance program established under Chapter 32, Human Resources Code, or the child health plan established under Chapter 62, Health and Safety Code.