Medigap Insurance is a supplementary insurance policy.
For availing this insurance you should have any of the medical insurance policy first like mediclaim or medicare. This insurance does not cover your overall medical insurance it only covers the part which are left by the normal medical insurance policies, means the things which are not covered by the normal medical policies are covered by this policy that is why it is called the Medigap. The gap word indicates the gap which is overlooked by normal insurance policies. So the expenses on medical related things which are not covered under normal medical policies are covered by this policy as to keep us safe from extra financial burden which can arise due to any disease or medical problems.