IN Code §27-1-37.5-11(b)(1-2)

(b) A health plan shall respond to a request delivered under section 10 of this chapter as follows:

(1) If the request is delivered under section 10(b) of this chapter, the health plan shall immediately send to the requesting health care provider an electronic receipt for the request.

(2) If the request is for an urgent care situation, the health plan shall respond with a prior authorization determination not more than seventy-two (72) hours after receiving the request.