Simply put, the Waiver of Pre-Existing Medical Conditions covers, or “waives” the companies right to exclude pre-existing medical conditions from their policy. It's a feature only available with certain comprehensive package plans for trip cancellation/trip interruption. It's what's known as an extra time sensitive benefit, the waiver of pre-existing medical conditions does not cost anything extra, it's not an option you can add to your policy. It is only available if you qualify for it.
Waiver of Pre-Existing Medical Conditions “waives” travel insurance Pre-existing Medical Condition Exclusion- Pre-Existing Medical Conditions would be covered