What is the primary purpose of the 1-day payment window rule?

The primary purpose of the 1-day payment window rule is to combine specific outpatient services with inpatient claims for reimbursement. This rule is applicable to services rendered within 1 day of an inpatient admission. It aims to streamline the billing process for certain outpatient services that are directly related to a patient's inpatient stay. By including these services on the inpatient claim, hospitals can receive a consolidated payment rather than billing for outpatient services separately. This approach not only simplifies the billing process but also ensures that the reimbursement reflects the comprehensive care provided during the inpatient admission.

The other options do not accurately reflect the intent of the 1-day payment window rule. The aim is not to allow outpatient services to be billed separately, nor is it focused solely on ensuring that hospitals bill only for services performed on their premises or to increase overall reimbursements for outpatient services.