(a) A group hospital service corporation may not:
(1) contract to provide to a member a physician or any medical services;
(2) contract to practice medicine in any manner;
(3) control or attempt to control the relations existing between a member and the member's physician; or
(4) restrict the right of a patient to obtain the services of any licensed physician.
(b) This section does not prohibit a group hospital service corporation from contracting with:
(1) a health organization certified under Chapter 162, Occupations Code; or
(2) a physician or other health care provider under rules adopted for preferred provider plans.