Every Patient should have one MRN type PatientNumber. This should be the primary identifier for the Patient in the sending system and typically not change. If a National Identifier (such as NHS Number) is used as the MRN it should also be submitted as an NI type PatientNumber. Only 1 of each type should be sent. This must only be used for the Patient's own Contact Details and not those of third parties. From NHS Data Dictionary ISO 3166-1 Use the 3-char alphabetic code. Current GP / GP Practice Person to Contact about the Patient's Care. This element should not be submitted without prior discussion with the UKRR. Ethnic Group Occuptation Primary Language Blood Type (Current) Blood Rhesus (Current)