OPPS Data (APC Weights, Conversion Factor, Copayments, Cost-to-Charge Ratios (CCRs), Data Claims, Geometric Mean Calculation, Outlier Payments, and Wage Index), contact Erick Chuang via email at Erick.Chuang@cms.hhs.gov or Scott Talaga via email at Scott.Talaga@cms.hhs.gov.