Wash. Rev. Code § 48.43.815
(1) For group health plans other than small group health plans issued or renewed on or after January 1, 2023, a health carrier shall provide coverage for medically necessary donor human milk for inpatient use when ordered by a licensed health care provider with prescriptive authority or an international board certified lactation consultant certified by the international board of lactation consultant examiners for an infant who is medically or physically unable to receive maternal human milk or participate in chest feeding or whose parent is medically or physically unable to produce maternal human milk in sufficient quantities or caloric density or participate in chest feeding, if the infant meets at least one of the following criteria:
(3) For purposes of this section:
[ 2022 c 236 s 1.]