_dta:
  1.  by Jean Roth , jroth@nber.org , 24 Sep 2016
  2.  Source URL: http://www.dartmouthatlas.org/tools/downloads.aspx
  3.  Source Workbook: MedPar_MSDRGCodes_Age0to99_2007_2014.xlsx
  4.  Source Worksheet: Table
  5.  The MedPAR File contains inpatient hospital and skilled nursing facility (SNF)
  6.  final action stay records. Each MedPAR record represents a stay in an inpatient
  7.  hospital or SNF. Each MedPAR record may represent one claim or multiple claims,
  8.  depending on the length of a beneficiary's stay and the amount of services used
  9.  throughout the stay.
 10.  MedPar Data Dictionary https://www.resdac.org/cms-data/files/medpar-rif/data-documentation

msdrg_cd:
  1.  MS-DRG (Medical-Severity Diagnostic-Related Groups) Definition:
  2.  a statistical system of classifying any inpatient stay into groups for the purposes of payment.
  3.  The MS-DRG classification system divides possible diagnoses into more than 20 major body systems
  4.  and subdivides them (745) for the purpose of Medicare reimbursement.
  5.  The 745 MS-DRGS replaced the 538 DRGs previously used to classify Medicare inpatient stays.
  6.  Instead of a two-tiered structure (with CC and without CC), MS-DRGs introduced a three-tiered structure:
  7.  1) MCC - Major Complication/Comorbidity; 2) CC - Complication/Comorbidity; 3) Non-CC - No Complication/Comorbidity
  8.  MS-DRGs replaced DRGs on October 1, 2007
  9.  Example of repalcement: DRG 127 was no longer the DRG for principal diagnosis congestive heart failure.
 10.  In place of DRG 127 were three new DRGs: MS-DRGs 291, 292, and 293,
 11.  depending upon the secondary diagnoses reported along with the principal diagnosis of CHF.

  obs:         6,112                          
 vars:             5                          24 Sep 2016 03:13
 size:       849,568                          (_dta has notes)
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              storage   display    value
variable name   type    format     label      variable label
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
msdrg_cd        str3    %9s                 * Medicare Severity Diagnostic-Related Group code
year            int     %9.0g                 Year
label           str126  %126s                 Medicare Severity Diagnostic-Related Group label
nrecs           long    %10.0g                # of records with this Medicare Severity Diagnositic-Related Group code during t
nppl_any        long    %10.0g                # of people with this Medicare Severity Diagnotic-Related Group code during the
                                            * indicated variables have notes
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Sorted by: msdrg_cd  year