I see what you are saying now. No, you don't need to send the claim on paper with the referral attached. There are several ways to handle this, depending on what the doctor wants you to do/the reason for the referral. You already know that if an auth # is present, how to get that on the claim, so that takes care of that.
For everyone else with a referral, here are some options:
1. If the patient is being referred for an actual consultation, and not a transfer of care, list the referring doctor in the referring provider section of the claim, and keep the referral in the patients chart. That way the doctor is covered on proof that the first of the three needed "R's" is being met in billing a consultation code.
2. Some offices always list the referring doctor in the referring provider section of the claim, even when it is not necessary to process the claim, others do not. That decision is up to the doctor. Some want to be able to track referrals for various reasons, others do not care. In my office, we do not care, and when I get a paper referral from another providers EMR on my fax machine(we don't do EMR in my office), or the patient hands me one, I just stick it in their chart, and my doctor will dictate in the tx note that the patient was referred by Dr. So and So. Come to think of it, none of the doctors I bill for bother with adding the referring doctor, unless it is needed to process the claim.