Query a patient's identities across systems using IHE PIXm and PDQm mobile profiles

Steps

1. For PIXm: send a GET request to the Patient Identity Cross-Reference Manager's PIXm endpoint using the patient's known identifier as a query parameter (e.g., GET [base]/Patient?identifier=system|value&_format=json) to retrieve all cross-referenced identifiers
2. Parse the returned Bundle of Patient resources and extract the identifier elements from each entry to collect all known identifiers for the patient across domains
3. For PDQm: send a GET request to the Patient Demographics Supplier with demographic search parameters (family, given, birthdate, gender, address-city) to perform a patient demographics query
4. Evaluate the Bundle entries in the PDQm response, checking Patient.meta.tag or extensions for match confidence scores where supported
5. Use the resolved patient identifiers from PIXm to scope subsequent FHIR resource queries to the correct patient domain identifier