(i) notwithstanding any inconsistent provisions of this subdivision, the commissioner shall promulgate regulations establishing, subject to the approval of the state director of the budget, methodologies for determining rates of payment for the services described in this subdivision. Such regulations shall reflect utilization of the ambulatory patient group (APG) methodology, in which patients are grouped based on their diagnosis, the intensity of the services provided and the medical procedures performed, and with each APG assigned a weight reflecting the projected utilization of resources. Such regulations shall provide for the development of one or more base rates and the multiplication of such base rates by the assigned weight for each APG to establish the appropriate payment level for each such APG. Such regulations may also utilize bundling, packaging and discounting mechanisms. If the commissioner determines that the use of the APG methodology is not, or is not yet, appropriate or practical for specified services, the commissioner may utilize existing payment methodologies for such services or may promulgate regulations, and may promulgate emergency regulations, establishing alternative payment methodologies for such services.