_dta:
  1.  additional_changes201011 set up by Jean Roth , jroth@nber.org , 14 Jul 2015

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.

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.

  obs:             0                          
 vars:             5                          14 Jul 2015 13:54
 size:             0                          (_dta has notes)
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              storage   display    value
variable name   type    format     label      variable label
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ndc             str13   %13s                * National Drug Code (NDC)
ndcdash         str13   %13s                * National Drug Code (NDC) with Dashes
hcpcs           str5    %9s                 * Healthcare Common Procedure Coding System (HCPCS)
change          str30   %30s                  Change
newvalue        str4    %9s                   New Value
                                            * indicated variables have notes
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Sorted by:  ndc  hcpcs  change  newvalue