2023 Nevada Revised Statutes › Chapter 616C - Industrial Insurance: Benefits for Injuries or Death › NRS 616C.099 - Rating of disability for subsequent injury; required proof to reduce percentage of present disability; required forms of evidence; lack of documentary evidence.

1. If a rating evaluation was completed for a previous disability involving a condition, occupational disease, organ, anatomical structure or other part of the body that is identical to the condition, occupational disease, organ, anatomical structure or other part of the body being evaluated for the present disability, the percentage of disability for a subsequent injury must be determined by deducting the percentage of the previous disability from the percentage of the present disability, regardless of the edition of the American Medical Association’s
Guides to the Evaluation of Permanent Impairment
as adopted by the Division pursuant to NRS 616C.110 used to determine the percentage of the previous disability. The compensation awarded for a permanent disability on a subsequent injury must be reduced only by the awarded or agreed upon percentage of disability actually received by the injured employee for the previous injury regardless of the percentage of the previous disability.
2. If no rating evaluation performed before the date of injury or onset of the occupational disease exists for apportionment of percentage of present and previous disabilities pursuant to subsection 1, the percentage of the present disability must not be reduced unless:
(a) The insurer proves by a preponderance of the evidence that medical documentation or health care records that existed before the date of the injury or onset of the occupational disease that resulted in the present disability demonstrate evidence that the injured employee had an actual impairment or disability involving the condition, occupational disease, organ, anatomical structure or other part of the body that is the subject of the present disability; and
(b) The rating physician or chiropractic physician states to a reasonable degree of medical or chiropractic probability that, based upon the specific information in the preexisting medical documentation or health care records, the injured employee would have had a specific percentage of disability immediately before the date of the injury or the onset of the occupational disease if, in the instant before the injury or the onset of the occupational disease, the injured employee had been evaluated under the edition of the American Medical Association’s
Guides to the Evaluation of Permanent Impairment
that had been adopted by the Division pursuant to NRS 616C.110.
3. The documentation or records relied upon pursuant to subsection 2 must provide specific references to one or more of the following:
(a) Diagnoses;
(b) Measurements;
(c) Imaging studies;
(d) Laboratory testing; or
(e) Other commonly relied upon medical evidence that supports the finding of a preexisting ratable impairment under the specific provisions of the edition of the American Medical Association’s
Guides to the Evaluation of Permanent Impairment
that had been adopted by the Division pursuant to NRS 616C.110 at the time of that rating evaluation.
4. If there is physical evidence of a prior surgery to the same organ, anatomical structure or other part of the body being evaluated for the present disability but no medical documentation or health care records regarding that organ, anatomical structure or other part of the body can be obtained, the rating physician or chiropractic physician may apportion the rating provided that the applicable requirements of subsection 2, other than any requirement to:
(a) Have medical documentation or health care records; or
(b) Base a rating upon medical documentation or health care records,
are satisfied.
5. If there is no physical evidence of a prior surgery to the same organ, anatomical structure or other part of the body being evaluated for the present disability and no medical documentation or health care records of a preexisting whole person impairment for the identical condition, occupational disease, organ, anatomical structure or other part of the body being evaluated for the present disability exist for the purposes of subsection 1 or 2, the percentage of present impairment must not be reduced by any percentage for the previous impairment.
(Added to NRS by 2021, 1177)