The unit only paid medical insurance, but not social security.

If it is illegal, the employer may be required to pay medical insurance. Social security includes endowment insurance, basic medical insurance, industrial injury insurance, unemployment insurance and maternity insurance. According to the law, the unit should buy five insurances including medical insurance for employees. Therefore, it is illegal for the unit not to pay medical insurance, and it should be required to make up.

Legal objectivity:

Article 23 of the Social Insurance Law of People's Republic of China (PRC), employees shall participate in the basic medical insurance for employees, and the employer and employees shall jointly pay the basic medical insurance premium according to the provisions of the state. Individual industrial and commercial households without employees, part-time employees who have not participated in the basic medical insurance for employees and other flexible employees can participate in the basic medical insurance for employees, and individuals pay the basic medical insurance premium in accordance with state regulations.