QTD and YTD DAX formulas - data results in pivot

I have QTD and YTD formulas in my power pivot. Oe of the data examples is revenue per doctor.

When I pivot the data and select, say, October as a month to show me MTD, QTD and YTD results, it shows me only the doctors active in October. It beautifully calclulates their QTD and YTD revenue, but omits the dcotors that were active in prior months, e.g docs who quit. 

I need to show ALL the doctors, regardless of whether they had revenue in this particular month.

How do I do that?

This is my formula:

MOS is my date field.

YTD_OperRevenue:=TOTALYTD(SUM(MORTbl[Oper Revenue]),MORTbl[MOS], ALL(MORTbl[MOS]))

Thank you!

Lena