Under the inpatient prospective payment system (IPPS), there is a three-day payment window (formerly referred to as the 72-hour rule). This rule requires that outpatient preadmission services that are provided by a hospital up to three calendar days prior to a patient's inpatient admission be covered by the IPPS MS-DRG payment for

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The three-day payment window rule under IPPS covers both diagnostic services and therapeutic services if the inpatient principal diagnosis code matches the code used for pre-admission services.

Under the Inpatient Prospective Payment System (IPPS), There Is a Three-Day