_dta:
  1.  records_ndcs_added 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.

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.

ndcmod:
  1.  Healthcare Common Procedure Coding System (HCPCS) Level II codes
  2.  may require the use of modifiers to capture the exact nature of the service.
  3.  The Level II modifiers are two alphabetic or alphanumeric digits.

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.

hcpcsmod:
  1.  HCPCS Level II codes may require the use of modifiers to capture the exact nature
      of the service.
  2.  The Level II modifiers are two alphabetic or alphanumeric digits.

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:         2,625                          
 vars:             9                          9 Feb 2018 15:57
 size:       133,875                          (_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
ndcmod          str2    %9s                 * National Drug Code Modifier Code
hcpcs           str5    %9s                 * Healthcare Common Procedure Coding System
                                                (HCPCS)
hcpcsmod        str2    %9s                 * Healthcare Common Procedure Coding System
                                                (HCPCS) Modifier Code
relatedchangerequest
                int     %10.0g                Related Change Request
fileyear        int     %9.0g                 Year Data File Source
filemonth       byte    %9.0g                 Month Data File Source
ndcdash         str13   %13s                * National Drug Code (NDC) with Dashes
                                            * indicated variables have notes
-----------------------------------------------------------------------------------------
Sorted by: ndc  ndcmod  hcpcs  hcpcsmod