Which type of data is NOT typically collected by billing systems during the revenue cycle?

Billing systems in the healthcare revenue cycle primarily focus on gathering information that directly impacts the billing and reimbursement processes. Patient demographics, service dates, and procedure codes are essential components collected during this cycle.

Patient demographics provide necessary information about the patient, such as their name, contact information, and insurance coverage, all of which are crucial for submitting claims correctly and determining the patient's financial responsibility.

Service dates are vital for billing purposes, as they indicate when the healthcare services were provided. This information is necessary to align with insurance policy guidelines and ensure accurate billing for services rendered within the correct timeframe.

Procedure codes are used to describe the medical services or procedures performed on a patient. They are critical for coding the claims accurately, which aids in the correct processing of payments.

In contrast, employee performance metrics do not directly relate to the billing process. While they are important for evaluating staff efficiency and outcomes in a healthcare setting, they are not relevant data points that billing systems typically track during the revenue cycle. Hence, this choice stands out as not being typically collected by billing systems.