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Unfortunatley no policy will cover pre-existing conditions. However, some policies do offer coverage for the acute onset of a pre-existing condition. The best policy for your father would be Safe Travels USA Comprehensive. It is the only policy that will cover the acute onset of a pre-existing condition for a person who is 70 years of age or older. If you would like to view this policy you can look here.
Insurance rates are regulated by law. You can't find the same insurance plan for a lower price anywhere else