Download Link: National Provider Identifier Ruby Code

If you’re looking for more information on this topic, a couple of links are:

http://www.claredi.com/download/npi_resources.php
http://www.medavanthealth.com/implementation/npi/NPI_check_digit.pdf

#!/usr/bin/env ruby
# NPI Validation Routine

# The NPI validation is done as follows:
# 1 ) For the purposes of this validation routine, isolate the last
#    digit of the NPI and do not use it in any steps outlined below;
# 2 ) Precede the NPI with 80840;
# 3 ) Double the value of alternate digits, beginning with the
#    rightmost digit, remember that the check digit is not to be used;
# 4 ) Total the value of the individual digits from step #3;
# 5 ) Total the value of the unaffected digits;
# 6 ) Add the two sums from steps #4 and #5;
# 7 ) Take the sum of step #6 and go to the next higher number
#    ending in zero;
# 8 ) Subtract the sum of step #6 from the next higher number
#    ending in zero from step #7;
# 9 ) If the value in step #8 matches the last digit in the
#    submitted NPI, the NPI is valid.
#

# Example of Check Digit Validation of the NPI

# The NPI submitted is 1234567893. The NPI validation is done as follows:
# 1 ) For the purposes of this validation routine, isolate the last
#    digit of the NPI (3) and do not use it in any steps outlined below;
# 2 ) Precede the NPI with 80840 (8 0 8 4 0 1 2 3 4 5 6 7 8 9 3);
# 3 ) Double the value of alternate digits, beginning with the
#    rightmost digit, remember that the check digit is not to be used (0 8 2
#    6 10 14 18);
# 4 ) Total the value of the individual digits from step #3
#    (0+8+2+6+1+0+1+4+1+8) which equals 31;
# 5 ) Total the value of the unaffected digits (8+6+4+2+0+8+8)
#    which equals 36;
# 6 ) Add the two sums from steps #4 and #5 (31+36) which equals 67;
# 7 ) Take the sum of step #6 and go to the next higher number
#    ending in zero which is 70;
# 8 ) Subtract the sum of step #6 from the next higher number
#    ending in zero from step #7 (70-67) and the value is 3;
# 9 ) The value in step #8 matches the last digit in the submitted
#    NPI, therefore the NPI is valid.

# try running with: ./npi.rb 1234567893 1234567891 9876543213

# prime the ARGV pump, if nothing was passed in
ARGV[0] ||= "1234567893"
ARGV.each { |npi_orig|
  #convert to array, leave off last digit, reverse it, convert to integer
  npi = ("80840" + npi_orig[0..-2]).scan(/./).reverse.collect {|digit| digit.to_i}
  total = 0;
  npi.each_index {|index|
    npi[index] = npi[index] * 2 unless ((index % 2) > 0);
    # tally up the digits into total, even if there are multiple
    npi[index].to_s.scan(/./).each{|digit| total += digit.to_i}
  }
  status = (npi_orig[-1..-1] == ((((total + 10) / 10).to_i * 10) - total).to_s)
                  ? "" :" *NOT* "
  puts "The number #{npi_orig} is#{status}a valid NPI"
}

A recent personal project of mine required image upload, and creation of thumbnails, etc. acts_as_attachment fit the bill nicely, with the exception of square corners. I conjured up a snippet of code to trim the corners with RMagick, and voila! Round Corners on my images. Code follows. Note: due to MSIE braindamaged handling of PNG, this code creates GIF images (recently unencumbered by patents).

require 'RMagick'
include Magick
 
class SessionImage < ActiveRecord::Base
 
  belongs_to :user
 
  acts_as_attachment (:storage => :file_system,
                      :thumbnails => {'large' => '320',
                                      'medium' =>  '120',
                                      'thumb' => '90'},
                      :max_size => 5.megabytes,
                      :content_type => :image)
  before_thumbnail_saved do |record, thumb|
    img = Magick::Image::from_blob(thumb.attachment_data).first
    cols = img.columns
    rows = img.rows
    # Make the background green, so we know if something went wrong
    draw = Draw.new {self.background_color = 'green'}
    # Draw a round rectangle into the "Draw" object
    draw.roundrectangle(0, 0, cols-1, rows-1, 10, 10)
    # Draw the image froim before into the Draw Object
    draw.composite(0,0,0, 0,img,InCompositeOp)
    # Have to create a new image for some reason - GIF it for MSIE
    newimg = Magick::Image.new(cols,rows)
        {background_color = 'none', self.format = 'gif'}
    # This is the money line - puts the round corner image into our new image
    draw.draw(newimg)
    newimg['comment'] = 'Round Corners'
    # Replace the data that was sent to us.
    thumb.attachment_data = newimg
  end
 
  validates_as_attachment
 
 
# This is required, because we change whatever image type
# that was sent in to GIF
  def thumbnail_name_for(thumbnail = nil)
    return filename unless thumbnail
    basename, ext = filename.split '.'
    "#{basename}_#{thumbnail}.gif"
  end
 
end

Enjoy!

dhw