Sec. 8. As used in this chapter, "standard charge" means the regular rate established by the diagnostic imaging facility for an item or service provided to a specific group of paying patients. The term includes the following:
(1) Gross charge.
(2) Payer-specific negotiated charge.
(3) De-identified minimum negotiated charge.
(4) De-identified maximum negotiated charge.
(5) Discounted cash price.