Payment by an employer for direct primary care services as defined in RCW 48.150.010 when used for medical services on an allowed industrial injury or occupational disease claim does not disqualify: (1) The employer from participating in a retrospective rating plan; (2) any related group sponsor from promoting a retrospective rating plan; or (3) any related plan administrator from administering a retrospective rating plan, provided the employer or group sponsor or plan administrator provides any medical cost or payment information that may be required by the department. Prior to the first retrospective rating adjustment for the plan year beginning January 1, 2012, the department shall determine the information needed and any changes to the retrospective rating premium and claim cost calculations to maintain appropriate and equitable retrospective rating refunds when employers pay for direct primary care services. These changes shall apply beginning with the January 1, 2012, plan year.

The department may adopt rules to implement this section.