Is it ever appropriate to put a value in Patient.identifier which you know is probably not a unique identifier for that real person? For example, some payers (insurers) assign a single subscriber number to everyone in a nuclear family and then also assign separate unique member numbers to each of those people. Would it be right to put that same subscriber number (along with other identifiers) in Patient.identifier for each of the family members?
I know there are cases where multiple Patient resources will contain duplicate identifiers due to data entry errors or missing links. I’m just looking for general FHIR best practices guidance on how to handle identifiers which we know aren’t likely to be unique.