If the physicians are in the same group/same specialty, you would report under the physician providing 99291. The IOM says: Physicians of the same specialty within the same group practice bill and are paid as though they were a single physician (§30.6.5).
Additionally, 99292 can only be billed with 99291, so it could not be reported alone.
Additionally, 99292 can only be billed with 99291, so it could not be reported alone.