This thread has been running for over 2 years on and off including questions about some heavy duty medication, so that may all be an indication that you have had back/health problems more extensive than some simple surgery.
It is therefore entirely to be expected that your AME would need to discuss your case with the FAA.
What the FAA calls disqualifying conditions are those where the AME must disqualify you from certification without the need to confer with the FAA.