Coding causes of death to statistical categories
Volume 1: Tabular list
Volume 1 of the ICD-10 has 22 chapters, most of which cover particular body systems, special diseases or external factors. There are, however, two exceptions: Chapter XVIII: Symptoms, signs, and abnormal clinical and laboratory findings, not elsewhere classified and Chapter XXII: Codes for special purposes. The broad chapter titles indicate the wide range of conditions included, with a large number of codes required to cover them all.
Each chapter is divided into blocks of related conditions which are then subdivided into three-character categories and four-character (and subsequent) subcategories. The use of an alphabetical character at the beginning of each of the three-character codes results in more than 2600 such codes being available – each of which can have up to 10 four-character subcategories.
Health Information Systems Knowledge Hub (2012). Strengthening civil registration and vital statistics for births, deaths and causes of death: resource kit. University of Queensland.