HL7 Event : A04 : Register Patient

  MSH           Message Header
  EVN           Event Type
  PID           Patient Identification
   [PD1]        Additional Demographics
  [ { NK1 } ]   Next of Kin / Associated Parties 
  PV1           Patient Visit
  [ PV2 ]       Patient Visit - Additional Info.
  [ { DB1 } ]   Disability Information 
  [ { OBX } ]   Observation/Result
  [ { AL1 } ]   Allergy Information
  [ { DG1 } ]   Diagnosis Information
  [  DRG  ]     DRG Information
   [ { PR1      Procedures
    [{ROL}]     Role
   }]
  [ { GT1 } ]   Guarantor Information
  [ 
    { IN1       Insurance Information
    [ IN2 ]     Insurance Information - Addit. Info.
    [ IN3 ]     Insurance Information - Cert.
    } 
  ]
  [ ACC ]       Accident Information
  [ UB1 ]       Universal Bill Information
  [ UB2 ]       Universal Bill 92 Information