generated: '2026-08-14'
method: searched
source: https://fhir.eclinicalworks.com/ecwopendev/documentation + https://connect4.healow.com/apps/jsp/dev/r4/fhirClinicalDocumentation.jsp
  + https://www.eclinicalworks.com/resources/certified-ehr-technology/
versioning:
  scheme: fhir-release + tenant EHR build
  current: FHIR R4 (4.0.1) via eCW FHIR Facade 1.6
  note: There is no independent API version number. Capability is a function of (a) the FHIR release — R4 only — and (b) the
    eClinicalWorks EHR build the individual practice is running. USCDI v1 is supported on 11.52.305C, 12.0.1, 12.0.2 and 12.0.3;
    USCDI v3 requires 12.0.2(04000407) or 12.0.3(04009267) and above; FamilyMemberHistory and Observation (OBGYN) require
    12.0.3.04009331+; DocumentReference (Progress Note) and Organization (Vaccine Manufacturer) require 12.0.3.04009405+.
    If the practice has not upgraded, the API returns a response indicating the read/search operation for that scope is not
    supported.
  docs: https://connect4.healow.com/apps/jsp/dev/r4/fhirClinicalDocumentation.jsp
  upgrade_path: Customers request a version upgrade by opening a case on the Customer Portal (my.eclinicalworks.com).
deprecation:
  policy_url: null
  sunset_header: false
  deprecation_header: false
  note: 'No deprecation or sunset policy is published, and no RFC 8594 Sunset/Deprecation header support is documented. The
    only forward-notice commitment eClinicalWorks publishes is commercial, not technical: "eClinicalWorks will notify customers
    of any future API licensing or usage fees at least 30 days in advance of such fees taking effect" (ONC Certified EHR Technology
    page). Version retirement is handled through the EHR build lifecycle rather than an API deprecation schedule.'
certification_lifecycle:
  program: ONC Health IT Certification Program
  criterion: 45 CFR 170.315(g)(10) Standardized API for Patient and Population Services
  real_world_testing:
    url: https://www.eclinicalworks.com/resources/certified-ehr-technology/
    note: Test plans are filed each November for the following calendar year; results are filed each February. 2024, 2025
      and 2026 plans and 2024/2025 results are published.
  chpl: https://chpl.healthit.gov/
sla:
  url: null
  uptime_target: null
  note: No public SLA or uptime target for the FHIR APIs. Availability commitments sit inside the customer contract.
status_page: https://instatus.com/now/en/eclinicalworks.com
change_log:
  url: null
  note: No dated API changelog or release-notes feed is published for the FHIR APIs. Change is announced through EHR build
    notes and the Customer Portal, neither of which is public.
endpoint_directory:
  note: Both facades publish an ONC-required service base URL directory as a live FHIR Bundle of Organization + Endpoint resources.
  provider_facing:
    url: https://fhir.eclinicalworks.com/ecwopendev/external/practiceList
    entries: 17229
    host: fhir4.eclinicalworks.com
    probed: '2026-08-14'
    http_status: 200
    bytes: 15604444
  patient_facing:
    url: https://connect4.healow.com/apps/api/v1/fhir/activated_clinical_endpoints
    entries: 17291
    host: fhir4.healow.com
    probed: '2026-08-14'
    http_status: 200
    bytes: 15086250
  not_committed: Both bundles are ~15 MB and change continuously; they are recorded by URL and shape rather than snapshotted
    into this repo.
deprecated_operations: []