NCCI has recently analyzed the impact of the AMA Guides Sixth Edition for three states that recently switched from the Fifth Edition to the Sixth Edition, finding a trend where substantial decreases in impairment ratings resulted.
In Tennessee, impairment ratings for part of the body dropped by 16 percent, while the impairment ratings for whole person dropped by 25 percent, after switching to the Sixth Edition.
Likewise, in New Mexico, impairment ratings for part of the body dropped by 6 percent, while the impairment ratings for whole person dropped by 32 percent after switching to the Sixth Edition.
In Montana, the average impairment rating dropped by 28 percent after switching to the Sixth Edition.
NCCI noted that the impact of switching to the Sixth Edition on a state’s workers’ compensation costs depends on various factors, including the state’s underlying benefit structure, changes in the average impairment and/or disability ratings, and the percentage of workers’ compensation benefits attributable to PPD benefits.
The complete study can be accessed here: https://www.ncci.com/documents/Impact_of_AMA_Guides.pdf
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