In many countries, drug regulatory agencies and pharmaceutical manufacturers currently use a variety of medical terminologies to code clinical information (e.g. MedDRA, COSTART, WHO-ART, ICD-9, ICD-9-CM, J-ART, and HARTS). A knowledge of different reglementary dictionaries used is very important. The reporter must be aware of coding practices and the coder must reproduce, as closely as possible, the Investigator's own terms which describe the adverse events occurring following the use of a product.

The purpose of this site is to help coders, data managers, CRAs and all persons involved in clinical trials, to find some very useful information concerning the coding of clinical data in relation to drug therapy. Coding conventions, medical expertise and coding review experience are often needed to check that the data are coded appropriately and consistency. Also, the persons in charge of coding must be familiar with current dictionaries and the international guidelines.