Display Rows With No Data

I have a query which is grouped by year, facility name, and billing type and needs to display several columns of aggregate values for each of these, e.g. count of cases, sum of cases reviewed, average length of stay, etc. It would look like this:

2003 ABC Hospital Billed DRG 123 22 6.5
2003 ABC Hospital Billed Per Diem 23 0 4.2
2003 DEF Hospital Billed DRG 456 120 12.3
2003 DEF Hospital Billed Per Diem 56 10 2.1

However, if a facility does not have any Per Diem billings for example, how can I generate a row for it anyway? I cannot use a crosstab since I have multiple different values to display. I tried the following union query:

SELECT YR,FacilityName,BilledDRG,NumberOfCases,AverageLen gthOfStay,CasesReviewed,CasesDenied,AvgOflos,[Billing Eligibility] FROM qryDistHIVCasesStatsDAC
UNION SELECT YR,FacilityName,BilledDRG,0,0,0,0,0,null FROM qryDistHIVCasesStatsDACDRG
UNION SELECT YR,FacilityName,BilledDRG,0,0,0,0,0,null FROM qryDistHIVCasesStatsDACPD
ORDER BY YR, FacilityName, BilledDRG;

where qryDistHIVCasesStatsDAC
is the original query,

qryDistHIVCasesStatsDACDRG shows the year, facility name, and "Billed DRG"
qryDistHIVCasesStatsDACPD shows the year, facility name, and "Billed Per Diem"

but then I would get e.g.
2003 ABC Hospital Billed DRG 123 22 6.5
2003 ABC Hospital Billed DRG 0 0 0
2003 ABC Hospital Billed Per Diem 23 0 4.2
2003 ABC Hospital Billed Per Diem 0 0 0
2003 GHI Hospital Billed DRG 456 120 12.3
2003 GHI Hospital Billed DRG 0 0 0
2003 GHI Hospital Billed Per Diem 0 0 0

what I want is:
2003 ABC Hospital Billed DRG 123 22 6.5
2003 ABC Hospital Billed Per Diem 23 0 4.2
2003 GHI Hospital Billed DRG 456 120 12.3
2003 GHI Hospital Billed Per Diem 0 0 0

In other words, for each year, each facility should have a row "Billed DRG" and a row "Billed Per Diem" and only one row of each.

Thanks for your assistance. I hope I have explained this adequately.