This subchapter does not apply to:
(1) a credit accident and health insurance policy subject to Chapter 1153;
(2) any group specifically provided for or authorized by law in existence and covered under a policy filed with the State Board of Insurance before April 1, 1975;
(3) accident and health coverages that are incidental to any form of a group automobile, casualty, property, workers’ compensation, or employers’ liability policy approved by the commissioner; or
(4) any policy or contract of insurance with a state agency, department, or board providing health services:
(A) to eligible individuals under Chapter 32, Human Resources Code; or
(B) under a state plan adopted in accordance with 42 U.S.C. Sections 1396-1396g, as amended, or 42 U.S.C. § 1397aa et seq., as amended.