The main purpose of this project is to support the WSMA’s role on the Surprise Billing Workgroup created by 2HSB 1065 with a goal of reducing healthcare costs for Washington’s patients. We will analyze the WA-APCD data to assess variations in costs by procedure and geography to identify differentials in utilization of out-of-network providers. The Surprise Billing Workgroup is responsible for advising how best to use the WA-APCD to establish commercially reasonable reimbursement. Specifically, our aims are to 1) support the determination of a commercially reasonable reimbursement from the WA-APCD data, 2) have data-driven awareness of ways in which WSMA can implement best practices to support legislature’s efforts around this bill. These two aims enable us to drive toward our mission to “Provide strong physician leadership and advocacy to shape the future of medicine and advance quality care for all Washingtonians.” We would like a fully-formed understanding of the bill’s impact on Washington State’s healthcare ecosystem, as our association plays an important role representing the physicians and physician assistants in our state. The results will not be used for commercial purposes.