(a) A health maintenance organization may not engage in retaliatory action, including refusal to renew or cancellation of coverage, against a group contract holder or enrollee because the group or enrollee or a person acting on behalf of the group or enrollee has filed a complaint against the health maintenance organization or appealed a decision of the health maintenance organization.

(b) A health maintenance organization may not engage in retaliatory action, including refusal to renew or termination of a contract, against a physician or provider because the physician or provider has, on behalf of an enrollee, reasonably filed a complaint against the health maintenance organization or appealed a decision of the health maintenance organization.

See https://statutes.capitol.texas.gov/Docs/IN/htm/IN.843.htm#H