Append query w/ duplicate problem

[John Daily]

I am having a problem with this append query and it
appending duplicate records. I have tried all sorts of
syntax to get it to not do that. I am in A2000 and that
is the only fields in the Payment Info table. I have even
tried to change the properties of the query and that still
didn't work.
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INSERT INTO [Payment Info] ( acct_num, total_charges,
total_pmts, total_adjst, acct_bal )
SELECT DISTINCT [CT Denials].pat_number, [CT
Denials].total_charges, [CT Denials].total_pmt_amt, [CT
Denials].total_adjst_amt, [CT Denials].acct_bal
FROM [CT Denials] INNER JOIN [Payment Info] ON [CT
Denials].pat_number = [Payment Info].acct_num;