code: public void addPatientParticipantObject(String patientId)
  	{
  		addParticipantObjectIdentification(
  				new RFC3881ParticipantObjectCodes.RFC3881ParticipantObjectIDTypeCodes.PatientNumber(), 
  				null,
  				null, 
  				null, 
  				patientId, 
  				RFC3881ParticipantObjectTypeCodes.PERSON, 
  				RFC3881ParticipantObjectTypeRoleCodes.PATIENT, 
  				null, 
  				null);
  	}
docs: Adds a Participant Object Identification block that representing a patient
  involved in the event
  
  @param patientId Identifier of the patient involved