What is catastrophic health insurance?
catastrophic health insurance is Health insurance which provides protection against the high cost of treating severe or lengthy illnesses or disabilities. Generally such policies cover all, or a specified percentage of medical expenses above an amount that is the responsibility of another insurance policy, up to a maximum limit of liability.
source: A GLOSSARY OF TERMS FOR COMMUNITY HEALTH CARE AND SERVICES FOR OLDER PERSONS. World Health Organization, 2004.