The article presents the provisions of the International Classification of Functioning (ICF), disability, the relationship of changes in health, personal and social factors of a person with therapeutic pathology in order to determine the criteria of disability, substantiate the need and scope of rehabilitation measures in the field of health and social protection. The purpose of this work was to analyze the data, means, methods and conditions of using ICF to organize the effective work of rehabilitation centers for patients, as well as to evaluate its results. The World Health Organization approved the systematization of international classifications necessary for epidemiological control and coordination of public health efforts during medical and social expertise. ICF, disability and health is becoming increasingly important in the work of clinicians of different specialties. Acting as a classifier of health characteristics and all related circumstances, the ICF can be used in many areas of public life: healthcare, social protection, insurance, social employment, education, economics, social policy, legislation. Comprehensive diagnostic and functional information allows giving a broader and more meaningful description of the state of health of a particular person or group of people. In this context, the definition of a disability group has medical, legal and social significance, as it is associated with specific relations in society: the availability of benefits for a disabled person, payment of a disability pension, disability restrictions. The practical significance of the results lies in the fact that the developed method of applying the ICF classification makes it possible to evaluate the effectiveness of medical rehabilitation of patients in the conditions of the modern healthcare system.