Wash. Admin. Code § 192-610-020
When leave is taken because of an employee's own serious health condition or the serious health condition of a family member, certification from a health care provider will be required. Certification must include the following:
(3) Other information as requested by the department to determine eligibility for the qualifying event; and either
[Statutory Authority: RCW 50A.04.215. WSR 19-08-016, § 192-610-020, filed 3/22/19, effective 4/22/19.]