Which coding category is likely to require prior authorization due to its complexity?

The correct choice is high severity codes. This coding category often includes procedures and services that involve significant complexity or risk factors, leading insurers to establish stricter guidelines for reimbursement. Because these high severity codes are associated with advanced medical interventions or treatments that could have substantial costs or implications for patient health, prior authorization is typically required.

This authorization process enables payers to review the medical necessity, appropriateness, and overall justification for the service before it is rendered, ensuring that patients receive care that is warranted by their medical condition. The additional scrutiny associated with high severity codes is balanced by the level of care being provided, emphasizing patient safety and effective resource use in healthcare.

In contrast, self-limited codes, minimal codes, and moderate codes are generally associated with less complex situations that typically do not require prior authorization, as the clinical indications are clearer or the interventions are standard and low-risk.