An issued check is verified in a computer-implemented positive-pay bank check processing system. A scanned check amount, a scanned bank account number, and a scanned check number are read from a scanned image of the issued check. A payee name field on the scanned image of the issued check is located, and a scanned payee name is read from the payee name field. Based on the bank account number and the check number, a record payee name or names are retrieved from an issued check file listing checks issued by a payer or owner of the checking account on which the issued check is drawn. A payee name field on the scanned image of the issued check is located, and a scanned payee name is separated from other information in payee name field, such as payee address. The scanned payee name is matched against a lexicon of record payee name variations based on the record payee name or names. Also, standard noise payee names are added to the lexicon to create a competition with the payee name from check issued file. The payee name on the check is verified if the similarity between the scanned payee name and a payee name from the lexicon indicates a high confidence match. If the payee name is verified, the issued check is authenticated as a positive pay check. If the scanned check amount is compared to the record check amount, and the check amount may also be verified when the scanned check amount and the record check amounts are the same.
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