Certified Outpatient Coder (COC) Practice Exam 2026 – All-in-One Guide for Exam Success!

For an emergency department visit that spans across two dates of service, the correct date reported is the date of admission. This is because coding guidelines dictate that for encounters in the emergency department, the date associated with the service rendered is the date of admission, which reflects when the patient initially presented for care. This is important for accurately capturing the nature of the visit, especially for coding the specific services provided and ensuring proper billing.

Additionally, the date of discharge may not capture the entirety of the visit if the services provided during the visit include significant treatments or procedures initiated on the admission date. It's also important to note that the date of billing and the last date of service do not relate directly to the actual services performed during the emergency visit and could lead to discrepancies in coding. Therefore, the date of admission remains the most relevant and critical date for accurate reporting in this scenario.