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The principal diagnosis is defined as the diagnosis established after study to be chiefly responsible for occasioning the patient’s episode of care in hospital. In some cases, the principal diagnosis is described in terms of a treatment for an ongoing condition (for example, care involving dialysis or rehabilitation).
The source of these data is the AIHW National Hospital Morbidity Database. Other data on the principal diagnosis reported for admitted patients are available in the Australian hospital statistics reports. Some data have been revised since previously published. For confidentiality, some data have been suppressed.
Data cubes will open in a new window.
The use of the different editions in the data cubes means that data across years may not be exactly comparable.
The variables in the data cubes are:
The measures (values ) in the data cubes are:
Within the cubes, users can view the diagnoses by using a pull-down menu and can work down from the broad chapter level in the ICD classifications to more specific categories (i.e. principal diagnosis code), as illustrated below:
Users of the data cubes are likely to require some familiarity with ICD-9-CM and ICD-10-AM and have access to the full publications. This data access system does not allow searching on keywords or ICD-9-CM/ICD-10-AM codes. Users will generally need to know what chapter the information they are looking for is in, to work down to more specific levels of detail.
Principal diagnoses are classified according to either the International Classification of Diseases, 9th Revision, Clinical Modification (ICD-9-CM) or the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, Australian Modification (ICD-10-AM). The use of the different classifications (ICD-9-CM and ICD-10-AM) in the data cubes means that data for 1998–99 to 2013–14 may not be exactly comparable with data for 1993-94 to 1997-98.
In addition, there are some differences in the coding between editions and these will be reflected in the cube. Readers should refer to the National Centre for Classification in Health (NCCH) for information on how to access the full classification and for detailed information on the differences between ICD-9-CM, ICD-10-AM and the different editions of ICD-10-AM.
The following is a list of the ICD disease chapters and the code ranges covered by each:
In order to maintain confidentiality, some data have been suppressed. This has been applied at the three-digit/character level for the principal diagnosis data cubes.
Data have been suppressed for a particular diagnosis if:
Data for the suppressed categories will not appear in the data cubes, but will be included in the sub-chapter, chapter and grand totals. Thus, the sum of separation counts presented within a chapter or sub-chapter for some codes may not match the total.