What are the three types of referrals in medical billing?

• A. Primary, secondary, and tertiary referral.
• B. Regular referral, urgent referral, and STAT referral.
• C. Internal, external, and cross-referral.
• D. Preauthorization, precertification, and final referral.

Answer: (B)

Understanding referral urgency is key in medical billing. There are three main categories that describe how quickly a referral must be processed: regular (routine) referrals, urgent referrals, and STAT referrals. A regular referral is planned and handled through standard processing without time pressure. An urgent referral is needed sooner because of medical necessity, but it isn’t immediate. A STAT referral is required right away to address an urgent or life‑threatening situation, triggering fastest possible processing and documentation.

This set of terms helps determine how the referral is documented and when it must be completed for the patient to receive timely care and for the claim to be processed smoothly. Other groupings listed don’t reflect standard referral urgency categories used in typical medical billing workflows.