(a) The department shall adopt regulations necessary to implement this chapter.
(b) Notwithstanding the rulemaking provisions of the Administrative Procedure Act (Chapter 3.5 commencing with Section 11340 of Part 1 of Division 3 of Title 2 of the Government Code), the department may, if it deems appropriate, implement, interpret, or make specific this chapter by means of provider bulletins, written guidelines, or similar instructions from the department, until regulations are adopted.