Client Identification

1.When verifying a patient's identity what is not an appropriate/approved identifier?
2.What can the failure to correctly identify patients result in?
3.To correctly identify a patient how many approved identifiers are needed?
4.Is stating to the patient/client, "your date of birth is 1 January 1987" a correct way to identify a patient?
5.To prevent errors, when are patient/client identifiers verified?
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