What type of insurance coverage allows the insured to purchase more insurance after a specified period of time?

The type of insurance coverage that allows the insured to purchase more insurance after a specified period of time is known as "guaranteed insurability" or "guaranteed purchase option" coverage. This feature is often found in life and health insurance policies, allowing policyholders to increase their coverage without undergoing additional medical underwriting. This option is especially beneficial for individuals who anticipate changes in their insurance needs due to life events.