Section 388-447-0060. Progressive evaluation process step IV—How does the department determine the severity of multiple impairments?
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(1) If you have more than one impairment, we determine the overall severity rating by deciding if your impairments have a combined effect on your ability to be gainfully employed.
(2) When you have two or more diagnosed impairments that limit work activities, we assign an overall severity rating as follows:
(3) We deny incapacity at this step when:
(a) The overall severity rating is two; or
(b) Substance use is material to your impairment under WAC 388-447-0001 and your overall severity rating is two when symptoms related to substance use or a diagnosis of chemical dependency are not considered.
(4) We approve incapacity at this step when the overall severity rating is five.