sch.4-sec.5Assessment if pre-existing mental disorder

sch.4-sec.5 Assessment if pre-existing mental disorder

If an injured person has a pre-existing mental disorder, a medical expert must— work out a percentage impairment for the pre-existing mental disorder at the time immediately before the injury using the steps stated in section 4 (the pre-injury rating ); and work out a percentage impairment for the current mental disorder using the steps stated in section 4 (the post-injury rating ); and subtract the pre-injury rating from the post-injury rating. The remaining percentage impairment is the PIRS rating assessed by the medical expert for the mental disorder of the injured person. See also section 11 . (sch.4-sec.5-ssec.1) If an injured person has a pre-existing mental disorder, a medical expert must— work out a percentage impairment for the pre-existing mental disorder at the time immediately before the injury using the steps stated in section 4 (the pre-injury rating ); and work out a percentage impairment for the current mental disorder using the steps stated in section 4 (the post-injury rating ); and subtract the pre-injury rating from the post-injury rating. (sch.4-sec.5-ssec.2) The remaining percentage impairment is the PIRS rating assessed by the medical expert for the mental disorder of the injured person. See also section 11 .

• (a) work out a percentage impairment for the pre-existing mental disorder at the time immediately before the injury using the steps stated in section 4 (the pre-injury rating ); and
• (b) work out a percentage impairment for the current mental disorder using the steps stated in section 4 (the post-injury rating ); and
• (c) subtract the pre-injury rating from the post-injury rating.