Hi Anil,
Do you know how long the insurance will be valid after my resignation?
Insurance will STOP after your last day with TCS if you do not opt for COBRA.
As per US laws, you have the option of availing COBRA.
COBRA is the law which makes it mandatory for the company to provide you the SAME insurance that you had with them, while employed to carry on after you leave.
The only caveat is that you have to pay the full insurance premium from your own pocket. Please remember that while you are with TCS, you are only contributing a part of the total monthly health insurance premium. Once you leave and avail COBRA, you would need to pay full amount.
TCS HR will send you one form for COBRA before your last day to know if you want to avail it or not.