Class: Provider

Inherits:
Object
  • Object
show all
Includes:
Personable
Defined in:
lib/health-data-standards/models/provider.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Personable

included

Class Method Details

.luhn_checksum(num) ⇒ Object 



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# File 'lib/health-data-standards/models/provider.rb', line 35

def self.luhn_checksum(num)
  double = {'0' => 0, '1' => 2, '2' => 4, '3' => 6, '4' => 8, '5' => 1, '6' => 3, '7' => 5, '8' => 7, '9' => 9}
  sum = 0
  num.reverse!
  num.split("").each_with_index do |char, i|
    if (i%2)==0
      sum+=double[char]
    else
      sum+=char.to_i
    end
  end
  sum = (9*sum)%10

  return sum.to_s
end

.valid_npi?(npi) ⇒ Boolean

validate the NPI, should be 10 or 15 digits total with the final digit being a checksum using the Luhn algorithm with additional special handling as described in www.cms.gov/NationalProvIdentStand/Downloads/NPIcheckdigit.pdf

Returns:

  • (Boolean) 


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# File 'lib/health-data-standards/models/provider.rb', line 21

def self.valid_npi?(npi)
  return false unless npi
  return false if npi.length != 10 and npi.length != 15
  return false if npi.gsub(/\d/, '').length > 0 # npi must be all digits
  return false if npi.length == 15 and (npi =~ /^80840/)==nil # 15 digit npi must start with 80840

  # checksum is always calculated as if 80840 prefix is present
  if npi.length==10
    npi = '80840'+npi
  end

  return luhn_checksum(npi[0,14])==npi[14]
end

Instance Method Details

#records(effective_date = nil) ⇒ Object 



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# File 'lib/health-data-standards/models/provider.rb', line 14

def records(effective_date=nil)
  Record.by_provider(self, effective_date)
end