I am hoping someone can steer me to written documentation regarding if a provider could only submit their own documentation or the documentation of other providers in a group practice when medical records are requested, particularly to establish medical necessity. Can all medical records, regardless of the provider or entity, be sent to to substantiate the medical necessity (pre-authorization or denial) of a patient's stay if the patient is classified as a "inpatient"? If a provider orders testing, is it possible for the testing to be sent even if the provider is not the reading provider? I would be extremely grateful for any feedback.