Under the inpatient prospective payment system (IPPS), there is a three-day payment window (formerly referred to as the

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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 patients inpatient admission be covered by the IPPS MS-

DRG payment for -

A. diagnostic services.
B. therapeutic (or non-diagnostic) services whereby the inpatient principal diagnosis code (ICD-9-CM) exactly matches the code used for pre-admission services.
C. therapeutic (or non-diagnostic) services whereby the inpatient principal diagnosis code (ICD-9-CM) does not match the code used for pre-admission services.
D. both A and B.