Outlier Epic cluster: just 2 of 739 production endpoints share this CapabilityStatement shape, including Atrium Health Wake Forest Baptist. This cluster advertises zero US Core 6.1 profiles in its CapabilityStatement, which integrators relying on profile validation hit as a surprise on go-live. A long-tail deployment variant that integrators rarely see in vendor sandbox documentation.
A CapabilityStatement shape cluster groups production FHIR endpoints by the exact CapabilityStatement they serve at runtime. Epic publishes one reference CapabilityStatement, but production hospitals deploy several distinct shapes of it — each cluster is one of those shapes.
2eda1513ac6c36a5…AllergyIntolerance · CarePlan · CareTeam · Condition · Coverage · Device · DiagnosticReport · DocumentReference · Encounter · Goal · Immunization · Location · Medication · MedicationDispense · MedicationRequest · Observation · Organization · Patient · Practitioner · PractitionerRole · Procedure · Provenance · QuestionnaireResponse · RelatedPerson · ServiceRequest · Specimen
Account · AdverseEvent · Appointment · Binary · BodyStructure · Communication · ConceptMap · Consent · DeviceRequest · DeviceUseStatement · Endpoint · EpisodeOfCare · ExplanationOfBenefit · FamilyMemberHistory · Flag · Group · ImagingStudy · ImmunizationRecommendation · List · Measure · MeasureReport · MedicationAdministration · NutritionOrder · Questionnaire · RequestGroup · ResearchStudy · ResearchSubject · Substance · Task · ValueSet
NC (1)
Patient.extension(us-core-birthsex) and Patient.extension(us-core-genderIdentity) absent for canonical sandbox patient Cannot determine from this single sample whether Epic doesn't implement these extensions or whether Derrick Lin's record simply lacks the data. Need a wider patient set to disambiguate. Recorded as 'missing' in element_deviations with that caveat.
From the public Epic overlay finding sweep (2026-04-26). Full vendor overlay has 22 findings with verbatim quotes and source URLs.
This outlier cluster has too few production endpoints for us to host a dedicated mock under /v/cluster/epic-cluster-E/ today. The modal Epic cluster is the wire shape that most production deployments use — that's the right starting point for integration testing.
Compatible with Epic's published FHIR R4 CapabilityStatement (Epic February 2026 release, fetched 2026-04-26). Not affiliated with or endorsed by Epic Systems Corporation. Trademarks of Epic Systems Corporation are used for identification only. Synthetic sandbox modeled after observed Epic deployment shapes. Not affiliated with the vendor or any listed hospital. Trademarks used for identification only.