Dear Sumit,
Based on my experience, ESIC cannot replace medical facilities. If an employee is receiving Rs. 10,000 per month, ESIC is mandatory. However, the availability of Group Medical Insurance depends on your company's policy.
In my company, ESIC-covered employees are also included in the (Private) group medical facility as per need, with insurance coverage of Rs. 100,000. Additionally, they are eligible for a medical allowance of Rs. 1,250 per month, which is reflected in their salary slip.
Please let me know if you need further clarification or assistance.
Thank you.