The article examines the issues of the legal nature of the reverse requirement of the insurer for compulsory medical insurance to the direct cause of harm to the life and health of the victim, as well as to the insurer who insured the civil liability of the harm-doer. The author analyzes two models of the reverse requirement in compulsory health insurance: subrogation and regression. The author comes to the conclusion that the opposite requirement is directly applied to the harm-doer based on a regression model. A counterclaim to the insurer who insured the civil liability of the harm-doer may be filed only under the subrogation model. The author analyzes special insurance legislation, scientific literature and judicial practice.