MII¶

Set PseudonymizationService=Mii to create pseudonyms using any backend that implements the MII Pseudonymization Implementation Guide 2026.1.0. The client uses the $pseudonymize and $de-pseudonymize operations. It sends and reads the parameters context, original and pseudonym as Identifier values only. The domain of a rule becomes the value of the context identifier.

When using the Mii service as a pseudonymization backend, you can optionally set the identifier systems used in the requests for each rule that uses the pseudonymize method. These can be set under a mii section inside the anonymization config. If a system is not set, the corresponding identifier is sent with only a value:

fhirPathRules:
  - path: nodesByType('Identifier').where(type.coding.where(system='http://terminology.hl7.org/CodeSystem/v2-0203' and code='MR').exists()).value
    method: pseudonymize
    # the domain will be used as the value of the "context" identifier
    domain: Transfer1
    mii:
      # the identifier system set on the "context" identifier (optional)
      contextSystem: https://fhir.example.com/identifiers/context
      # the identifier system set on the "original" identifier (optional)
      originalSystem: https://fhir.example.com/identifiers/patient-id

Basic auth¶

OAuth¶