Ans: The ESIC code number is a unique 17-digit identification number provided to every employer who is registered with the ESI scheme.  - The format of the employer code number is as follows: - The first 2 digits represent the current region in which the company is established.  - The next 2 digits represent the parent region (headquarters).  - The next 6 digits represent the company’s unique code.  - Next 3 digits represent the number of branches of the company.  - The last four digits represent the nature of the business. Employees also get a unique identification number after successful registration. That number is known as the Employee Insurance Number.