The International Classification of Diseases 9th revision, Clinical Modifications (ICD‐9‐CM) is the version of ICD envisaged in Italy by the legislation for the coding of diseases and related problems. ICD was developed by the World Health Organization (WHO) and over the years has become the de facto standard for statistical studies on morbidity and mortality rates and for epidemiological studies, as well as a it is recognized as a valid management tool for public health and hygiene. The standard is now at its eleventh revision (ICD‐11), approved in 2018 by the Member States, at the 72 World Health Assembly and which will come into force on 1 January 2022. ICD is translated and maintained in Italy by the WHO Italian Collaborating Center for the Family of International Classifications (CCIOMS), an organization that is part of the WHO-FIC Network, the international network of WHO collaborating centers for the Family of International Classifications which support WHO in the development, adoption by the World Health Assembly and dissemination of international health classifications. CCIOMS is recognized by the Italian Ministry of Health, with which it participates in the it.DRG project in order to provide the revision of coding and classification systems used in the Hospital Discharge Records (SDO) (i.e., the ICD-10 Italian version) and to experiment its use in the italian hospital context.

ICD-9-CM was developed in 1977 and the last Italian version update dates back to 2007. ICD-9-CM is mainly aimed at classifying morbidity data and introduces the classification of procedures. The Italian translation, realized and published by ISTAT in 1975, is used in accordance with the Ministerial Decree 26/07/1993 for the coding of clinical information collected through the Hospital Discharge Records (SDO) and, according to the provisions of the DPCM on EHR, for the coding of chronic, relevant and ongoing diseases within the Patient Summary (PS).

The system contains over 12,400 final diagnostic codes and over 3,700 final procedure codes. In particular, it is a multi-axial classification divided into 17 chapters, main categories of diseases and injuries, 10 of which are dedicated to the classification of diseases localized in specific organs or anatomical systems, while the other 7 describe specific types of conditions affecting the whole organism.

Use of ICD-9-CM according to the DPCM on EHR :

In accordance with the Technical Regulation attached to the DPCM on the EHR, the ICD-9-CM codes have to be used within the PS for coding:

  • Chronic and / or relevant diseases of the patient;
  • Coded representation of all known diseases in progress at the time of the PS compilation.

Last update: 05/08/2021