Report of the New South Wales Chief Health Officer	Table of contents Methods On this page: Commentary References Print version
	ICD Codes for diseases and procedures

• Discussion
  • Disease codes
  • Procedure codes
  • Disease codes for attributable fractions
  • ICD codes for potentially avoidable mortality
  • ICD codes for potentially avoidable hospitalisations

• Tables
  • Table 1. Disease codes
  • Table 2. Procedure codes
  • Table 3. Disease codes for attributable fractions
  • Table 4. ICD codes for potentially avoidable mortality
  • Table 5. ICD codes for potentially avoidable hospitalisations

DISEASE AND PROCEDURE CODES USED IN THIS REPORT.

This appendix details the codes from the International Statistical Classification of Diseases (ICD) used to prepare some of the data included in this report.

The 10th revision of the ICD (ICD-10) was generally implemented in Australia from 1998 onwards. It was a major update of the 9th revision (ICD-9). For some diseases or disease groups, it is not possible to construct a one-to-one mapping between the tw o revisions, and as a result there may be a small distortion of trend lines. Where there was a major change in the cases which would be selected, no trends have been shown.

For some disease groupings, codes differ between the modifications of ICD-9 used for the various data sources. These differences are shown in the table.

DISEASE CODES

ABS Deaths register
Causes of deaths registered before 1999 were coded according to the 9th revision of the International Classification of Diseases (ICD-9). From 1 January 1999 onwards, causes of death have been classified according to the 10th revision of the International Classification of Diseases (ICD-10).

Inpatient Statistics Collection
The reasons for admission to hospital were coded according to the 9th revision of the International Classification of Diseases, Clinical Modification (ICD-9-CM) for years up to and including 1997-98. From 1 July 1998, the reasons for admission have been co ded according to the 10th revision of the International Classification of Diseases, Australian Modification (ICD-10-AM).

Central Cancer Registry
Cases of cancer registered before July 1999 were classified according to ICD-9. Cases registered from 1 July 1999 onwards have been classified according to the 2nd edition of the International Classification of Diseases for Oncology (ICD-O-2). ICD-O-2 code s were translated by the Registry to ICD-10 codes, which were used to prepare this report.

PROCEDURE CODES

Inpatient Statistics Collection
Procedures carried out while patients were admitted to hospital were coded according to the 9th revision of the International Classification of Diseases, Clinical Modification (ICD-9-CM) for years up to and including 1997-98. From 1 July 1998, the procedu res have been coded according the MBS-Extended procedure classifications in ICD-10-AM. These codes are based on the Commonwealth Medicare Benefits scheme (MBS) and are relevant to Australian data only.

ICD codes for diseases and disease groups used to calculate deaths and hospitalisations attributable to alcohol or smoking are shown in Table 3. An electronic file of the aetiologic fractions developed by Ridolfo and Stevenson (2001) was obtained from the Australian Institute of Health and Welfare. The disease and injury groupings used in this file were defined using ICD-9 and ICD-9-CM. The appropriate groupings of ICD-10 and ICD-10-AM codes were developed for this report.

ICD codes for diseases and disease groups used to calculate potentially avoidable mortality are shown in Table 4. Tobias and Jackson (2001) defined conditions using ICD-9 codes only. The appropriate groupings of ICD-10 codes were developed for this report.

ICD codes for diseases and disease groups used to calculate potentially avoidable (ACS) hospitalisations are shown in Table 5. The categories used for the ambulatory care-sensitive conditions are based on those used by the Victorian Department of Human Services (DHS, 2001), which were defined according to ICD-9-CM codes. The appropriate groupings of ICD-10-AM codes were developed for this report.

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