Many covered reasons for trip cancellation and trip interruption, including bankruptcy or default, pre-existing conditions, and more require early plan purchase (within 10 days of initial trip deposit). (travelinsurancereview.net)
You purchase the travel insurance on the date of the initial initial trip deposit or within 7 - 30 days of the same, depending upon the specific policy. (insubuy.com)
Most travel insurance policies have limitations on pre-existing condition coverage which is almost always waived if the policy is purchased within 15 - 30 days of initial trip deposit. (travelinsurancereview.net)