For the purpose of this chapter, the kinds of insurance defined in Chapter 7 of this title shall be arranged in the following six classes:

(1) Life, accident, and sickness;

(2) Property, marine, and transportation;

(3) Casualty;

(4) Surety;

(5) Title; and

(6) Health maintenance organization.

Each of the groups numbered (1) through (6) shall constitute a class of insurance.