Which type of service might necessitate a preauthorization from a payer?

Surgical procedures often require preauthorization from a payer because they are typically more complex and involve a higher cost compared to other types of services. The preauthorization process serves to ensure that the procedure is medically necessary and covered by the insurance plan before it is performed. This step helps the payer manage costs and verify that the appropriate guidelines and criteria for the surgery are met. In contrast, routine check-ups and vaccinations generally do not necessitate preauthorization as they are preventive services, while referral appointments might not require it either, depending on the payer's policies and the nature of the referral. Thus, surgical procedures are clearly more likely to trigger the need for preauthorization, reflecting the payer's interest in overseeing substantial medical interventions.