opened on:  11 Jan 2018, 16:56:26

_dta:
  1.  records_ndcs_removed20181 set up by Jean Roth , jroth@nber.org , 11 Jan
      2018
  2.  NBER URL: http://www.nber.org/data/ndc-hcpcs-crosswalk-dme.html
  3.  Source Page: https://www.dmepdac.com/crosswalk/index.html
      https://www.dmepdac.com/crosswalk/2018.html

ndc:
  1.  The National Drug Code (NDC) serves as a universal product identifier for
      human drugs and biologics.
  2.  Each NDC must be reported as an 11-digit code unique to the manufacturer
      of the specific drug or product.

ndc13:
  1.  The National Drug Code (NDC) serves as a universal product identifier for
      human drugs and biologics.
  2.  Each NDC must be reported as an 11-digit code unique to the manufacturer
      of the specific drug or product.

hcpcs:
  1.  HCPCS codes are used by Medicare and monitored by the CMS .
  2.  HCPCS Level II codes are assigned to every service a medical practitioner
      provides
  3.  to a Medicare patient including durable medical equipment, prosthetics
      and orthotics supplies.
  4.  These codes are an alpha character followed by four numbers.

relationshipenddate:
  1.  The relationship end date between the NDC and HCPCS code.
  2.  A new relationship end date is listed whenever any of the following
      occur:
  3.  HCPCS Code Deletion
  4.  NDC Withdrawn
  5.  NDC deactivated

> removed20181.dta
  obs:           143                          
 vars:             4                          11 Jan 2018 16:56
 size:         4,433                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
ndc             str11   %11s                * National Drug Code (NDC)
ndc13           str13   %13s                * National Drug Code (NDC) with
                                                Dashes
hcpcs           str5    %9s                 * Healthcare Common Procedure
                                                Coding System (HCPCS)
relationshipenddate
                int     %td..               * Relationship End Date
                                            * indicated variables have notes
-------------------------------------------------------------------------------
Sorted by: ndc  hcpcs