Wash. Admin. Code § 388-828-9310
(2) The developmental disabilities administration (DDA) determines your community inclusion service level based on your support intensity scale (SIS) support needs index percentile ranking. DDA determines your SIS support needs index percentile ranking under WAC 388-828-4440 and as detailed in the following table:
| SIS support needs index percentile | Community inclusion service level | Maximum service hours per month |
| 0 - 9th percentile | A | Up to 3 hours |
| 10th - 19th percentile | B | Up to 6 hours |
| 20th - 29th percentile | C | Up to 9 hours |
| 30th - 44th percentile | D | Up to 12 hours |
| 45th - 59th percentile | E | Up to 15 hours |
| 60th - 74th percentile | F | Up to 18 hours |
| 75th - 100th percentile | G | Up to 20 hours |
[Statutory Authority: RCW 71A.12.030, 71A.12.040, 71A.12.120, and 34.05.330. WSR 19-06-053, § 388-828-9310, filed 3/4/19, effective 4/4/19. Statutory Authority: RCW 71A.12.030, 71A.12.040, 2015 3rd sp.s. c 4, and 42 C.F.R. § 441.301 (c)(4)-(5). WSR 18-03-174, § 388-828-9310, filed 1/23/18, effective 2/23/18. Statutory Authority: RCW 71A.12.030 and 2012 c 49. WSR 13-01-080, § 388-828-9310, filed 12/18/12, effective 1/18/13.]