Esic limit

Dear Sir & Madam

1. I would like to know upto what time the limit of ESIC coverage from the date of limit expiry.  
2. Once the after limit exceeds what is the liability of employer.
3. Is it necessary to cover them with either medical benefits or medical insurance
4. In case esic enhances the limit of coverage of insurance amount, the employee should be covered once again under esic. Whether we have to new number of for the employee or the old esi no. will be continued for the benefit of esi.
5. PLEASE CLARIFY AT THE EARLIEST.
6. SEND REPLY to : neilshekar @ gmail.com.