Is it fair to assume that a LengthofStay value (in Claims_Y1.csv) is a hospital stay (of the type p_i  or a_i  in the ε metric ) only if the placesvc (Place of Service) is Inpatient or Outpatient Hospital?

Also, do the DaysinHospital in the DaysinHospital_Y2.csv file also refer only to Inpatient and Outpatient stays?

What is the interpretation of 2-4 weeks for LengthofStay with placesvc set at home or other?

There are also Inpatient and Outpatient placesvcs where where the LengthofStay is blank. Are we to assume these are 0 days or 1 day?

Or are these just extra claims from Anesthesiology, Laboratory or Imaging associated with the same episode of care?

DaysInHospital_Y2 is derived from the claims table where a hospital stay includes an inpatient stay or an emergency visit. Note: you don't have enough information to calculate DaysInHospital_Y2 from the claims table.

Are you saying that the DaysInHospital_Y2 are only Inpatient and Emergency days and do not include Outpatient or Urgent Care?

Also when determining Y1 days in hospital (from the data in Claims_Y1.csv)  do we exclude the Outpatient days and use only the Inpatient and Emergency days?

In DaysInHospital_Y3.csv, we can find "66455760,0,13", meaning that the DaysInHospital of 66455760 is 13 in Y3, and there is no truncated claims. In Claims.csv, we can find that the LOS values of all the Y3 claims of the member are null, and none of them are suppressed.

Since all the claims are there and all the LOS values are 0, is it the case that DaysInHospital comes from not only the claims table, but also some other medical treatments that can not be claimed?

In Target.csv MemberID # 66455760 does have the indicator for claims-truncated. I beleive this applies to claims Y3 and the claims-truncated field in DaysInHospitalY3 applies to claims made in Y2.