Washington Providers Request for Adjustment (WPA) is a process used by Washington State Health Care Authority (HCA) to adjust claims that have already been processed and paid. This process allows providers to submit a request for additional reimbursement or an adjustment to an existing claim. The WPA process is used for claim edits, appeals, and post-payment claims reviews. There are two types of Washington Providers Request for Adjustment: Prepayment and Post-Payment. Prepayment Adjustment requests are submitted to HCA prior to the claim being processed and paid. Post-Payment Adjustment requests are submitted to HCA after the claim has already been processed and paid. WPA requests must include detailed information about the patient, the procedure performed, the diagnosis code, and the expected reimbursement amount. Providers must also include any applicable supporting documentation to support their request. HCA will review the request and determine whether an adjustment is warranted.