You can try using the marketing report under file, print, other misc reports. Choose your date range, the under target transactions choose select and navigate to the adjustment code list. Choose the one for payplan and then run the report.
Unfortunately, because the payplan and planbill adjustment codes post to the "Account" and not to a Patient on the ledger, the Marketing report will not pick it up. The Marketing report will only find that codes that are connected directly with a patient.