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Hospital admission data

Hospital admission unit record data are annually extracted from the Victorian Admitted Episodes Dataset (VAED) and supplied to VISU by the Victorian Department of Health and Human Services (DHHS).

Episodes recorded on the VAED are currently coded to the WHO International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, Australian Modification (ICD-10-AM), the WHO International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, Australian Modification. ICD-10-AM was originally developed by the National Centre for Classification in Health (NCCH) in Sydney with assistance from clinicians and clinical coders to ensure that the classification is current and appropriate for Australian clinical practice. The Australian Modifications of ICD-10 are generally updated every two years. The external causes chapters of ICD-10-AM describe the causes of injury, poisoning and adverse events (complications of medical and surgical care).

Injury records are identified by VISU as those with an ICD-10-AM injury code (S00-T98) or external cause code (U50-Y98) in any one of the 40 diagnosis codes recorded in the VAED. Adverse events and sequelae (late effects) of external causes of morbidity and mortality are usually not included in VISU reports.

The VAED data items held by VISU include:

Demographic/administrative items

  • Age, gender, postcode, suburb and local government area of residence
  • Country of birth
  • Date of admission, date of separation (discharge) and length of hospital stay (in days)
  • Separation type (patient destination on discharge from hospital): separation and transfer to acute hospital /extended care, death, separation to private residence,/accommodation, separation and transfer to aged care residential facility, separation and transfer to mental health residential facility etc.

Injury surveillance items

Up to 40 codes from any or all of the ICD-10-AM chapters can currently be assigned to each record. These codes are then used to derive the following injury surveillance variables that are added to the VISU-VAED dataset.

  • Cause of injury – transport, fall, poisoning etc. [Coded to ICD-10-AM Chapter 20: External Causes of Morbidity and Mortality (V00-Y34)]
  • Place of occurrence i.e. location of injury - home, road, street or highway etc. [Coded to ICD-10-AM Chapter 20: External Causes of Morbidity and Mortality (Y92.0-Y92.9)]
  • Activity when injured - sports, leisure, work etc. [Coded to ICD10-AM Chapter 20: External Causes of Morbidity and Mortality (U50-U73)]
  • Human intent – unintentional; intentional-assault, neglect, self harm; undetermined intent. Intent information is derived from the external cause of injury code.
  • Injury diagnosis i.e. exact injury code – superficial injury of scalp, fracture of neck of femur etc. [Coded to ICD-10-AM Chapter 19: Injury, Poisoning and Consequences of External Cause S00-T98]
  • Body region injured – head, thorax, shoulder, upper arm etc. Body region information is derived from the injury diagnosis variables.
  • Nature of main injury - open wound, fracture, dislocation/ sprain/strain etc. Nature of main injury is derived from the injury diagnosis variables.
  • Comorbidities – co-occurrence of injury with other diseases and conditions that can happen by chance or because there is some association between them (for example, suicide and mental disorders, drowning or hot water scalds and epilepsy). Co-morbidities are derived from the diagnosis variables (Coded to ICD-10-AM Chapters 1-17).