_dta:
  1.  coding_changes set up by Jean Roth , jroth@nber.org , 9 Feb 2018

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.

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.

  obs:             9                          
 vars:             7                          9 Feb 2018 15:57
 size:           450                          (_dta has notes)
-----------------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-----------------------------------------------------------------------------------------
ndc             str11   %11s                * National Drug Code (NDC)
ndcdash         str13   %13s                * National Drug Code (NDC) with Dashes
oldhcpcs        str5    %9s                   Old HCPCS
newhcpcs        str5    %9s                   New HCPCS
fileyear        int     %9.0g                 Year Data File Source
filemonth       byte    %9.0g                 Month Data File Source
ndc13           str13   %13s                * National Drug Code (NDC) with Dashes
                                            * indicated variables have notes
-----------------------------------------------------------------------------------------
Sorted by: ndc  oldhcpcs  newhcpcs