$sql = "SELECT * from claims WHERE " .
  "( bill_process = 1 or bill_process = 5) AND " .
  "status > 0 AND status < 4";
$res = sqlStatement($sql);

$billkeys = array();

while ($row = sqlFetchArray($res)) {
  $crow = sqlQuery("SELECT count(*) AS count FROM claims WHERE " .
    "patient_id = '" . $row['patient_id'] . "' AND " .
    "encounter_id = '" . $row['encounter_id'] . "' AND " .
    "version > '" . $row['version'] . "'");
  if ($crow['count']) continue;

  $ta = array();
  $ta['key'] = $row['patient_id'] . "-" . $row['encounter_id'];
  $ta['bill_process'] = $row['bill_process'];
  $ta['format'] = $row['target'];
  $billkeys[] = $ta;
}