Wash. Admin. Code § 182-543-3500
(1) The medicaid agency covers the purchase of the following ambulatory aids with stated limitations, without prior authorization:
[Statutory Authority: RCW 41.05.021 and 2013 c 178. WSR 14-08-035, § 182-543-3500, filed 3/25/14, effective 4/25/14. WSR 11-14-075, recodified as § 182-543-3500, filed 6/30/11, effective 7/1/11. Statutory Authority: RCW 74.08.090 and 74.04.050. WSR 11-14-052, § 388-543-3500, filed 6/29/11, effective 8/1/11.]