Use of the new Italian version of the International Classification of Diseases-Clinical Modification (ICD-9-CM) for the information system of immunization health services.

Compared to the previous one- the recently updated Italian version of the International Classification of Diseases - Clinical Modification (ICD-9-CM) includes new codes for the description of medical-related vaccinations procedures. In this work the new codes are described and the Classification is proposed as a possible tool for storing electronic information systems of immunization health services.