Dear ANNONYMOUS Friend,
First of all ESI is not a policy. It is an Act / Enactment. There is a scheme under this Act which is mandatory to certain establishments and certain class of employees upon certain parameters.
From your query what I feel is you need to understand first this law, it's salient features etc. I advise you to read ESI Act, if not then at-least a guide to employers on Labour Laws by Shri. S R Samant edited by Shri. Chheda recently. You ask your queries/ doubts thereafter. I am sure this forum will definitely address you.
You may also go through below given link:
http://www.esic.nic.in/CIRCULARS/ESI...%20English.pdf