_dta:
  1.  ndchcpcsawp20181 set up by Jean Roth , jroth@nber.org , 21 Dec 2017
  2.  Source: Jan 2018 AWP NDC-HCPCS Crosswalk_120417.xlsx workbook sheet
  3.  Health Care Common Procedure Coding System (HCPCS)
  4.  National Drug Code (NDC)
  5.  Average Sale Price (ASP)
  6.  Average Wholesale Price (AWP)
  7.  Hospital Outpatient Prospective Payment System (OPPS)

hcpcsdosage:
  1.  Dosage descriptor assigned to the HCPCS code (ex., 5 mcg.)

pkgsize:
  1.  amount in one item. (ex., For a product that is 100mcg/0.5 ml in one
      vial, the package size would be 0.5.)

pkgqty:
  1.  Package Quantity: number of items in the NDC (ex., For an NDC that is 4
      vials in a shelf pack, the package quantity would be 4.)

billunitspkg:
  1.  Billable Units Per Package: the number of billable units per package
      (ex., 100 mcg in a package divided by 5 mcg in the dosage descriptor = 20
      billable units per package.)

  obs:           200                          
 vars:            11                          5 Feb 2018 15:38
 size:        34,000                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
hcpcs           str5    %9s                   HCPCS Code
shortdescriptor str28   %28s                  Short Descriptor
labelername     str17   %17s                  Manufacturer Name
ndc             str12   %12s                  National Drug Code (NDC) or
                                                Alternate ID
ndcdash         str14   %14s                  National Drug Code (NDC) or
                                                Alternate ID
drugname        str62   %62s                  Drug Name (Brand Name or Generic
                                                Name)
hcpcsdosage     str7    %9s                 * Dosage descriptor assigned to the
                                                HCPCS code
pkgsize         double  %10.0g              * Package Size:  Amount in one item
pkgqty          byte    %10.0g              * Package Quantity:  Number of
                                                items in the NDC
billunits       double  %10.0g                Billable Units
billunitspkg    double  %10.0g              * Per Package: the number of
                                                billable units per package
                                            * indicated variables have notes
-------------------------------------------------------------------------------
Sorted by: ndc  hcpcs  labelername  shortdescriptor