In this chapter, "insurer" means an insurance company or other entity authorized to engage in the business of insurance in this state. The term includes:
(1) a stock or mutual property and casualty insurance company;
(2) a Lloyd's plan;
(3) a reciprocal or interinsurance exchange;
(4) a county mutual insurance company;
(5) a farm mutual insurance company;
(6) any insurer writing a line of insurance regulated by Title 10;
(7) all life, health, and accident insurance companies regulated by the department, including:
(A) a stock or mutual life, health, or accident insurance company;
(B) a fraternal benefit society;
(C) a nonprofit hospital, medical, or dental service corporation, including a group hospital service corporation operating under Chapter 842; and
(D) a stipulated premium company; and
(8) a health maintenance organization operating under Chapter 843.