This third edition of the Application of the International Classification of Diseases to Dentistry and Stomatology (ICD-DA) provides a coherent system for coding and classifying data on oral and dental disorders, particularly when electronic or mechanical means of retrieval and analysis are used. Scope of the classification includes all diseases and conditions that occur in, have manifestations in, or are associated with the oral cavity and adjacent structures. ICD-DA is derived from the Tenth Revision of the International Classification of Diseases (ICD-10) and should be used in conjunction with this parent work. For oral and dental disorders, most of the classifications provided by ICD-10 have been subdivided and expanded to include a fifth character. The purpose of this exclusive fifth character is to focus the attention of oral health personnel on the need for detailed diagnosis for each patient, to allow standardized recording of all diagnoses, and to facilitate comparison of data at an international level. Like the parent work, ICD-DA has a detailed tabular section followed by a comprehensive alphabetic index. The classification can be used in a contracted form, consisting of a relatively small number of broad headings, or in an expanded form that allows detailed analysis in areas of special interest. ICD-DA should prove valuable to a wide variety of users from governments collecting basic data to individual researchers practitioners and lecturers who require a convenient method for indexing their records and teaching material.