According to CPT guidelines, a patient is considered an outpatient until which event occurs?

According to CPT guidelines, a patient is considered an outpatient until which event occurs?

• A. Inpatient admission occurs
• B. Discharge occurs
• C. When treated in the emergency department
• D. When the patient leaves the facility

Answer: (A)

The boundary between outpatient and inpatient status is the formal inpatient admission. Until the hospital officially admits the patient as an inpatient, the encounter remains outpatient—even if care occurs in the emergency department or an observation unit. Once admission occurs, the patient is considered an inpatient, and inpatient coding rules apply. Discharge or leaving the facility describes what happens after care is completed, not the point at which status changes.

The boundary between outpatient and inpatient status is the formal inpatient admission. Until the hospital officially admits the patient as an inpatient, the encounter remains outpatient—even if care occurs in the emergency department or an observation unit. Once admission occurs, the patient is considered an inpatient, and inpatient coding rules apply. Discharge or leaving the facility describes what happens after care is completed, not the point at which status changes.