“An impairment percentage derived by means of the Guides is intended, among other purposes, to represent an informed estimate of the degree to which an individual’s capacity to carry out daily activities has been diminished.”įrom this highly qualitative statement which contains the word “estimate”, catastrophic impairment assessors are expected to select an exact score in a whole person impairment scenario in which 53% meets the threshold while 52% does not. The following introductory comment is found on of the AMA Guides 4 th edition,: The Guides allows rounding to the nearest 5% such that the de facto threshold becomes 53% WPI. The Statutory Accident Benefits Schedule requires an individual to suffer 55% whole person impairment under The AMA Guides 4 th edition in order to meet the catastrophic impairment threshold.
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