(b) The corporate organization shall be divided into four regional systems, as follows: (1) The Kauai regional health care system;(2) The Maui regional health care system;(3) The east Hawaii regional health care system, comprising the Puna district, north Hilo district, south Hilo district, Hamakua district, and Kau district; and(4) The west Hawaii regional health care system, comprising the north Kohala district, south Kohala district, north Kona district, and south Kona district; and shall be identified as regional systems I, II, III, and IV, respectively.