Summing Data in a Virtual Table

Eligible Population =

VAR Tab1 =

CALCULATETABLE(

Addcolumn(

Values(dwh FactService'[clientID]),

"@CountOfServices",

Calculate( distinctcount(factService'[ProcedureKey]) 

),

'dwh FactService'[ProcedureKey] in {99, 136, 60, 123, 124, 125, 126, 65, 66, 67, 68}

            &&

            'dwh FactService'[Full Service Date] <= MAX('dwh DimDate'[SmallDate])

            &&

            'dwh FactService'[Full Service Date] >= MIN('dwh DimDate'[SmallDate])

            &&

            'dwh FactService'[Age at Time Of Service] > 17

            &&

            'dwh FactService'[ServiceStatusName] = "Complete"

        )

 RETURN

COUNTROWS(

 FILTER(

  tab1,

  [@CountOfServices] > 1

 )

)

Assumed you wanted count of distinct procedure key, swap back to count if not

You needed calculate to get context transition, so the row context of client id filtered the procedures