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Emergency attendances

The Emergency Care Data Set (ECDS) is the national data set for urgent and emergency care. ECDS is part of Hospital Episode Statistics (HES) and is provided to OpenSAFELY via NHS Digital's Secondary Use Service (SUS)


  • Data provider NHS England.
  • Participation / Coverage Emergency Department attendances in NHS Trusts in England.
  • Update frequency in OpenSAFELY Approximately monthly.
  • Delay between event occurring and event appearing in OpenSAFELY * Approximately 1-2 months.
  • Collected information Attendance, admission and discharge dates; locations; presenting complaints; diagnoses.

Diagnoses and discharge destinations are coded using SNOMED CT.

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