31 Pa. Code §154.14(e)(1)(a)

(1) If the enrollee is admitted to a hospital or other health care facility, the emergency health care provider shall notify the enrollee’s managed care plan of the emergency services delivered within 48 hours or on the next business day, whichever is later. An exception to this requirement will be made where the medical condition of the patient precludes the provider from accurately determining the identity of the enrollee’s managed care plans within 48 hours of admission.
28 Pa. Code §9.753(a)

(a) A concurrent UR decision shall be communicated to the plan, the enrollee and the health care provider within 1-business day of the receipt of all supporting information reasonably necessary to complete the review. The plan shall give the enrollee and the health care provider written or electronic confirmation of the decision within 1-business day of communicating the decision.