Wash. Admin. Code § 388-449-0050 – How does the department determine the severity of multiple impairments?

(1) If you have more than one impairment, we decide the overall severity rating by determining 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:

Your Condition	Severity Rating
(i) All impairments are mild and there is no cumulative effect on basic work activities.	Mild
(ii) All impairments are mild and there is a significant cumulative effect on one or more basic work activities.	Moderate
(iii) Two or more impairments are of moderate severity and there is a very significant cumulative effect on basic work activities.	Marked
(iv) Two are more impairments are of marked severity.	Severe

[Statutory Authority: RCW 74.04.005, 74.04.050, 74.04.055, 74.04.057, 74.04.510, 74.08.090, 74.08A.100, 74.04.770, 74.04.0052, 74.04.655, 74.08.043, 74.08.335, and 2011 1st sp.s. c 36. WSR 12-10-042, § 388-449-0050, filed 4/27/12, effective 6/1/12.]