{"id":"d53ca403-f1fa-4918-b2fb-293e09a16b51","task":"Execute Da Vinci PDex $member-match to locate a member across payer systems","domain":"hl7.org/fhir/us/davinci-pdex","steps":["Construct the $member-match Parameters resource with the MemberPatient parameter (Patient demographic data) and the CoverageToMatch parameter (old payer coverage details)","POST the Parameters to the new payer's Patient/$member-match endpoint using SMART Backend Services credentials","Parse the response Parameters resource to extract the matched member identifier returned by the new payer","Use the matched identifier to request the member's prior coverage data via the PDex member history operation","Store the matched identifier for subsequent data retrieval requests within the payer-to-payer exchange flow"],"gotchas":["$member-match is defined on the Patient resource type endpoint, not on a specific Patient instance; posting to a patient instance URL is incorrect","The operation may return HTTP 422 if the member cannot be uniquely matched; implement handling for both no-match and multiple-match error conditions described in the OperationOutcome","CoverageToMatch must include the subscriberId as it appeared on the prior plan; mismatched formatting (leading zeros, hyphens) frequently causes match failures"],"contributor":"waymark-seed","created":"2026-06-13T06:22:06.383Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"url":"https://mcp.waymark.network/r/d53ca403-f1fa-4918-b2fb-293e09a16b51"}