Which code is used to report standby service that requires prolonged attendance, measured in 30-minute increments?

The code used to report standby service that requires prolonged attendance, measured in 30-minute increments, is 99360. This code specifically addresses the situation where a physician or other qualified healthcare professional is required to be on standby, providing coverage and immediate attention should the patient need it, which is distinct from regular patient care.

The specification of "prolonged attendance" highlights that this service is not just typical evaluations or visits; rather, it encompasses additional time beyond usual face-to-face patient interaction, particularly in urgent or unexpected situations. In this context, the measurement in 30-minute increments makes it clear how to document and bill for the extent of the service provided.

Other codes in the options have different purposes: for example, 99354 pertains to prolonged services in the outpatient setting, typically after a certain base level of care has been provided. Meanwhile, 99291 and 99285 are used for critical care and emergency department visits, respectively, which do not align with the requirement for standby service and attendance. Thus, 99360 is the most accurate choice for reporting standby services requiring extended attendance.