R.I. Gen. Laws § 27-20.6-1: Definitions.

As used in this chapter, the following terms shall have the following meanings:

(1) “Insurer” means every nonprofit medical service corporation, hospital service corporation, health maintenance organization, or other insurer offering and/or insuring health services; the term shall in addition include any entity defined as an insurer under § 42-62-4.

(2) “Primary insurer” means the insurer primarily liable in accordance with the anti-duplication provisions established by regulations promulgated by the director of business regulation.