Texas uses the Fourth Edition of the American Medical Association Guides to the Evaluation of Permanent Impairment to determine Impairment Ratings for injured workers. The Guide is to only apply to permanent impairments, defined as adverse conditions that are stable and unlikely to change.
The Guides require that a doctor performing an evaluation must first gather through and complete historical information on the medical condition(s) and then carry out a medical evaluation supported by appropriate tests and diagnostic procedures.
The doctor should determine the condition that seems to be of the most concern to the injured worker. That condition needs to be assessed and given a whole body impairment. Each of the unrelated conditions must be assessed and given a whole body impairment. Then all the conditions are combined using the Combined Values Chart.
The Guides find the impairment by DREs (Diagnosis Related Estimates), ROM (Range of Motion) and specific Diagnosis ratings. The Guides determine if the methods are combined or one method is to be used with the exclusion of the others.
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