Definition - What does Exclusion Rider mean?
An exclusion rider is an endorsement or provision in an insurance policy that lists the perils or hazards that the insurer will not cover. For this reason, policyholders might purchase supplemental policies to fill in the coverage gap.
Insuranceopedia explains Exclusion Rider
Policyholders should be aware of what perils or hazards their policy excludes from coverage, or they risk facing future unexpected financial burdens in case of a non-covered loss. Normally, any insurance policy includes some sort of exclusion. For example, renter's insurance may not include coverage for flood damage. Thus, renters in flood-prone areas may want to consider purchasing additional coverage.