Help With Getting Distinct Records From Multiple Columns In SQL Query

I'm exporting the following query to a datagrid, however in the result set, some values are duplicated (for various reasons... mostly old software and poor categorization)...On the records with identical values, I want to look at the account number and the DateOfService fields and search for joint distinct values and only display that...Current Example:  ACCT NUM   |  DATE OF SERVICE  |________________________________   43490          |     10/01/2006  08:15:23  |     35999          |     10/10/2005  12:00:00  |   35999          |     10/24/2005  12:45:30  |   35999          |     10/10/2005  12:00:00  |   35999          |     10/10/2005  12:00:00  |   23489          |     10/15/2006  15:13:23  |Desired Result:  ACCT NUM   |  DATE OF SERVICE  |________________________________   43490          |     10/01/2006  08:15:23  |     35999          |     10/10/2005  12:00:00  |   35999          |     10/24/2005  12:45:30  |   23489          |     10/15/2006  15:13:23  |Here is the query I'm working with... just can't figure out how to join or limit the results to ONLY unique matches in Acct Number AND DateOfService.  "SELECT     tblCH.ProcedureKey AS CPT, tblPC.Description, DATEDIFF(d, tblPat.BirthDate, " & _        " { fn NOW() }) / 365 AS Age,  tblPat.LastName, tblPat.FirstName, tblPat.BirthDate," & _        "  CAST(tblCH.AccountKey AS varchar) + '.' + CAST(tblCH.DependentKey AS varchar) AS Account, tblCH.DateOfService " & _        " FROM         dbo.Procedure_Code___Servcode_dat tblPC INNER JOIN " & _        " dbo.Charge_History___Prohist_dat tblCH ON tblPC.ProcedureKey = tblCH.ProcedureKey RIGHT OUTER JOIN " & _        " dbo.Patient_Info___Patfile_dat tblPat ON tblCH.AccountKey = (tblPat.AccountKey AND tblCH.DependentKey) = tblPat.DependentKey "Any suggestions from y'all SQL gurus?  I have to have this report ready for production by tomorrow morning and this is the last fix I need to make =Thank you =)