I hope this message finds you well. I am seeking clarification regarding the Total Knee Arthroplasty/Total Hip Arthroplasty Patient-Reported Outcome-Based Performance Measure (TKA/THA PRO-PM) under the Inpatient Quality Reporting (IQR) Program.

Could you please provide guidance on how "inpatient stay" is defined for this specific measure? Additionally, I would like to confirm whether observation stays are included or excluded as part of the inpatient stay for the purpose of this measure.