In a small number of MS-DRGs, classification is also based on the age, sex, and discharge status of the patient. These adjustments are made to reflect changes in treatment patterns, technology, and any other factors that may change the relative use of hospital resources.Д¬urrently, cases are classified into Medicare Severity Diagnosis Related Groups (MS-DRGs) for payment under the IPPS based on the following information reported by the hospital: the principal diagnosis, up to 24 additional diagnoses, and up to 25В procedures performed during the stay. Accordingly, section 1886(d)(4)(C) of the Act requires that the Secretary adjust the DRG classifications and relative weights at least annually.

Each DRG weight represents the average resources required to care for cases in that particular DRG, relative to the average resources used to treat cases in all DRGs.Д¬ongress recognized that it would be necessary to recalculate the DRG relative weights periodically to account for changes in resource consumption. The formula used to calculate payment for a specific case multiplies an individual hospital's payment rate per case by the weight of the DRG to which the case is assigned. Therefore, under the IPPS, we pay for inpatient hospital services on a rate per discharge basis that varies according to the DRG to which a beneficiary's stay is assigned. Section 1886(d) of the Act specifies that the Secretary shall establish a classification system (referred to as DRGs) for inpatient discharges and adjust payments under the IPPS based on appropriate weighting factors assigned to each DRG.

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