Generally, the ICD orients diagnoses around the organ system affected and the pathological or clinical diagnosis within each organ system, with additional broader and less specific codes where this is not possible or appropriate. 1 These include analysing the general health status of population groups, and monitoring the incidence and prevalence of diseases and other health problems in relation to other variables such as the characteristics and circumstances of the individuals affected. In practice, the International Classification of Diseases (ICD) has become the international standard diagnostic classification for many general epidemiological and health management purposes. Hospital data can be coded using a variety of systems. They have been particularly important for cardiovascular disease (CVD) statistics and research because there are few disease registers for CVD, and reporting of CVD is not mandatory, unlike most cancer types and certain infectious diseases. Routine administrative hospital data are an important source of information for population health, health services and research. Results: Large differences were observed in the numbers of events in grouped CVD outcomes, depending on the methods used.Ĭonclusions: In cases where the reporting and research interest relates to incident disease, it may be appropriate to prioritise specific disease categories and pathological homogeneity. This approach was then applied to linked hospitalisation data from individuals participating in the 45 and Up Study, a cohort study of 267 153 New South Wales residents aged 45 and over, to investigate the implications of the proposed approach for quantifying CVD. Methods: We reviewed the ICD diagnosis codes and procedure codes and developed an algorithm for classifying and categorising major CVD diagnoses. This paper proposes a pragmatic approach to using ICD diagnosis codes and procedure codes to capture major atherosclerotic and arteriovenous thromboembolic and related CVD. All of these have the potential to contribute valuable information on CVD. In addition, hospital data collections contain a range of data fields, including those relating to primary and additional diagnoses and those relating to procedures.

However, this category is heterogeneous and combines common severe atherosclerotic and thrombotic CVDs (such as myocardial infarction and pulmonary embolism) with common, less severe and pathologically dissimilar conditions (such as varicose veins and haemorrhoids). In particular, ICD codes under ‘Diseases of the circulatory system’ (I00−I99) are often grouped together into a general CVD category. International Classification of Diseases (ICD) diagnosis codes from hospital data collections are often used to classify CVD, but there is little published evidence on the most appropriate ways to use these codes to categorise CVD in a way that maximises the usefulness of hospital data for reporting and research. How such conditions are classified and grouped has implications for the use and interpretation of these data. Objectives and importance of the study: Routine hospital administrative data provide an important source of information about cardiovascular disease (CVD) for health statistics reporting, health services and research.

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