How to supplement the 9 digits of social security number?

Legal analysis: it doesn't matter whether the code is 10 or 9 digits, just the serial number of the social security card, as long as there is no error in the identity information related to the social security card.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 58 An employing unit shall, within 30 days from the date of employment, apply to the social insurance agency for social insurance registration for its employees. If the social insurance has not been registered, the social insurance agency shall verify the social insurance premium it should pay.

Employees-free individual industrial and commercial households who voluntarily participate in social insurance, part-time employees who do not participate in social insurance in the employing unit and other flexible employees shall apply to the social insurance agency for social insurance registration.

The state establishes a national unified personal social security number. Personal social security number is a citizen's identity number.

Article 59 People's governments at or above the county level shall strengthen the collection of social insurance premiums.

Social insurance premiums shall be uniformly collected, and the implementation steps and specific measures shall be stipulated by the State Council.