Wash. Admin. Code § 284-52-050
A major medical plan shall have an annual deductible amount of no less than one thousand dollars or more than five thousand dollars per person and shall provide at least the following benefits:
(2) Payment of at least seventy-five percent of the usual and customary charges for the following:
[Statutory Authority: RCW 48.02.060, 48.44.050 and 48.46.200. WSR 85-03-035 (Order R 85-1), § 284-52-050, filed 1/10/85; WSR 84-19-055 (Order R 84-4), § 284-52-050, filed 9/19/84.]