I have read where coders aren’t allowed to code off the EKG or x-ray report and we can only code the diagnosis after it’s been read by the treating physician.

Example: Dr. A, who is a Cardiologist, reads an EKG in the ER. He states in his report, the patient has an AV paced rhythm with a prolonged AV conduction. Dr. B, who is an ER physician, reads the EKG and notes that the patient has a left bundle branch block.
Do I code from Dr. A’s notes or Dr. B’s? Does anyone have any links or information pertaining to this subject?

Thank you so much in advance for your help!