Instabima
What is health insurance portability?
Portability means the ability to change to another product while retaining some part of the earlier one. When you port your mobile number you retain your existing number but change to another service provider. In case of a health insurance policy, portability allows you to change to a different plan of the same insurer or to another plan offered by another insurer. The waiting period for pre-existing diseases which have already lapsed in the old plan are carried forward to the new policy.
Moreover, any other waiting period applicable in the health plan which you have already waited out would be credited to the new plan. Thus, on porting, your renewal benefits are not lost. They are simply credited to the new policy.
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https://www.instabima.com/articles/portability-of-health-insurance