**  SAS Codes and Formats for Chronic Disease Hospitalizations  ;
**  FORMATS & LABELS  ;
**  The following format for defining chronic diseases is based on ICD-9-CM codes. ;
**  Before using these codes users should confirm that they are appropriate for their own study. ;

 VALUE $CHRONC                               /* chronic disease formats */
          '493 '-'4939'               = '01' /* asthma */
          '430 '-'4379'               = '02'
                              /* Vascular compl hypertension disease */
          '250 '-'2509'               = '03' /* diabetes mellitus */
          '401 '-'4059'               = '04' /* Hypertensive disease*/
          '410 '-'4149'               = '05' /* Ischemic Heart */
          '492 '-'4929','496 '-'4969' = '06' /* emphysema    */
              OTHER                   = '07'
          ;
   VALUE   CHRONCL                           /* chronic disease labels */
                      1 = 'Asthma        '
                      2 = 'Vascular compl'
                      3 = 'Diabetes      '
                      4 = 'Hypertensive  '
                      5 = 'Ischemic Heart'
                      6 = 'Emphysema     '
                     99 = 'Total of Above'   ;

**  SAS CODE  ;
        DIAG = SUBSTR(DX01,1,4);     * abstract the 1st 4 characters of
                                       1st diag *;
        CHRONIC = INPUT(PUT(DIAG,$CHRONC.),2.);
             if chronic = 7 then chronic = . ;