PRACTICAL USE OF ICF Severe disability: definition through ICF Topic 4 WHAT IS ICF? ICF stands for “International Classification of Functioning, Disability and Health”. ICF as a tool was prepared by the World Health Organization (WHO) to obtain a systematic classification which describes the changes in the state of health of a person and the related states. By selecting the specific categories in a checklist, it is possible to obtain an unbiased description of what is referred to as a person’s functioning and disability, i.e. the elements which determine their health condition.