Glattre E
Kreftregisteret, Montebello, Oslo.
Tidsskr Nor Laegeforen. 1990 Apr 10;110(10):1250-3.
The paper gives an account of the principal structure and main characteristics of the International Classification of Diseases, 1975 Revision (ICD-9), which has been used by Norwegian hospitals and the Norwegian public health administration since 1987. ICD-9 coding rules are examined, mainly the basic rule that transformation of diagnoses to codes should be complete, or should result in the smallest possible loss of information and convey no invented information. The rule of multiple coding states that, if possible, diagnoses which can be coded only with much loss of information should be divided into smaller entities. The ICD-9 code of the diagnosis comprises the codes of the set of entities which most reduces loss of information. If more than one set of entities represents the same amount of reduction in loss of information, then the set with the smallest number of entities should be chosen for reasons of reproducibility. The paper also presents the two procedures by which the corresponding ICD-9 category and code for a given diagnosis can be searched and identified.
本文介绍了《疾病和有关健康问题的国际统计分类，1975年修订本》（ICD - 9）的主要结构和主要特点，自1987年以来挪威医院和挪威公共卫生管理部门一直在使用该分类法。文中研究了ICD - 9的编码规则，主要是基本规则，即诊断到编码的转换应该完整，或者应尽可能减少信息损失且不传递虚假信息。多重编码规则指出，若可能，仅能以大量信息损失进行编码的诊断应分解为较小的实体。诊断的ICD - 9编码由最能减少信息损失的实体集的编码组成。如果不止一组实体表示相同程度的信息损失减少，那么出于可重复性的考虑，应选择实体数量最少的那一组。本文还介绍了两种搜索和识别给定诊断对应的ICD - 9类别和编码的方法。
