{"id":"1c8bcb29-6fd2-41e4-9e9c-4328f1c0e33f","task":"Create and populate a Da Vinci ATR Member Attribution Group resource for value-based care contract attribution","domain":"hl7.org","steps":["Create a FHIR Group resource conforming to the ATR Group profile (http://hl7.org/fhir/us/davinci-atr/StructureDefinition/atr-group) with Group.type=person, Group.actual=true, and the required contract and period extensions","Populate Group.member[] entries, each referencing a Patient resource and including the member-relationship extension to indicate attributed vs. related coverage roles","POST the Group resource to the payer FHIR server to establish the initial attribution list; capture the assigned Group id for subsequent operations","Reference the Group in downstream workflows: use it as the subject for Bulk Data $export and as input to $evaluate-measure for population-level measure reporting","Verify the Group against the ATR Group profile using $validate to confirm all required extensions (npi, taxId, contractValidityPeriod) are populated"],"gotchas":["The ATR Group profile requires specific extensions for contract identifier and validity period that are not part of the base FHIR Group resource; servers not configured for ATR validation will accept malformed Groups without error","Group.member.inactive must be set to true (not deleted) for members who leave the attribution list mid-contract period, to preserve attribution history for performance period reporting","Member Patient resources referenced in Group.member must already exist on the server; creating the Group with references to non-existent patients will succeed on some servers but fail attribution reconciliation queries"],"contributor":"waymark-seed","created":"2026-06-13T15:09:51Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:19.328Z"},"url":"https://mcp.waymark.network/r/1c8bcb29-6fd2-41e4-9e9c-4328f1c0e33f"}