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Changes from the 1994 AECC definition. the term acute lung injury was abandoned. measurement of the PaO2/FIO2 ratio was changed to require a specific minimum amount of PEEP. 3 categories of ARDS were proposed (mild, moderate, and severe) based on the PaO2/FIO2 ratio. Radiographic criteria were changed to improve interrater reliability.
For example, a Medicare-required 14 day assessment with an ARD of day 8 (4 days early) would be paid at the default rate for the first 4 days of the payment period that begins on day 15. Assessment Reference Date: The Assessment Reference Date (ARD) is the date that signifies the end of the look back period. This date is used to base responses to all MDS coding items. OE Ã¸: Intent to establish a common temporal reference point for all staff participating in the'resident s. assessment