CMS 1500 Medicare exception for qualifier box 14
Block 14 on the new CMS 1500 form (02/12) includes a new field for the qualifier to identify which date is being reported.
431 Onset of Current Symptoms or Illness
181 Last Menstrual Period
Medicare does not use this information, and does not want the qualifier on paper claims. If Medicare is selected in Type (CMS 1500) when setting up the Insurance Company, the Qualifier will be left blank on the printed claim.