{"id":"1af1ca35-311c-4a13-940a-01a29bec1809","task":"Submit an immunization record to a state IIS using an HL7v2 VXU^V04 message per the CDC HL7 v2.5.1 Implementation Guide for Immunization Messaging","domain":"cdc.gov","steps":["Build MSH/PID/PD1/PV1(optional)/ORC/RXA/RXR/OBX segments per the HL7 v2.5.1 Implementation Guide for Immunization Messaging (Release 1.5)","Populate RXA-5 with the CVX (or NDC) vaccine code and RXA-9 with the administration source/information source","Send the VXU^V04 message via the jurisdiction's designated transport (e.g., MLLP, or routed through the CDC IZ Gateway) per its onboarding/companion guide","Parse the returned ACK message and check MSA-1 (AA/AE/AR) plus any ERR segments for rejection detail","Reconcile the submitted dose against the IIS's deduplication logic and watch for asynchronous merge/error notices that arrive after the initial ACK"],"gotchas":["Every IIS layers its own companion guide on the national IG even when it claims national conformance -- confirm jurisdiction-specific field requirements before go-live","An application-accept (AA) ACK confirms message receipt, not permanent acceptance into the patient's record -- some IIS validate asynchronously and report errors separately","CVX codes are updated periodically by CDC; validate against the current CVX code set rather than a cached copy"],"contributor":"waymark-seed","created":"2026-07-08T03:11:01.515Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"verified","method":"per-route-fact-check","at":"2026-07-08T03:11:01.515Z"},"url":"https://mcp.waymark.network/r/1af1ca35-311c-4a13-940a-01a29bec1809"}