_dta:
  1.  coding_changes20182 set up by Jean Roth , jroth@nber.org , 9 Feb 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.

ndcdash:
  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.

  obs:             0                          
 vars:             4                          9 Feb 2018 15:56
 size:             0                          (_dta has notes)
-----------------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-----------------------------------------------------------------------------------------
ndc             str13   %13s                * National Drug Code (NDC)
ndcdash         str13   %13s                * National Drug Code (NDC) with Dashes
oldhcpcs        str5    %9s                   Old HCPCS
newhcpcs        str4    %9s                   New HCPCS
                                            * indicated variables have notes
-----------------------------------------------------------------------------------------
Sorted by: ndc