USER NOTE: THE 11-CHARACTER NDC CODE SHOULD BE LEFT JUSTIFIED AND BLANK-FILLED TO THE RIGHT. HOWEVER, USERS SHOULD CHECK THE 12-CHARACTER DATA ELEMENT FOR EACH STATE SINCE THERE ARE INSTANCES WHERE IT MAY BE RIGHT-JUSTIFIED OR CONTAIN AN IMBEDDED "0".
USER NOTE: THE 11-CHARACTER NDC CODE SHOULD BE LEFT JUSTIFIED AND BLANK-FILLED TO THE RIGHT. HOWEVER, USERS SHOULD CHECK THE 12-CHARACTER DATA ELEMENT FOR EACH STATE SINCE THERE ARE INSTANCES WHERE IT MAY BE RIGHT-JUSTIFIED OR CONTAIN AN IMBEDDED "0".
SOURCE: MSIS CLAIMS FILE: 'NATIONAL-DRUG-CODE'.