Morbidity

The rate of illness, injury and disability in a population; insurers use it to set premiums for health and disability insurance.

Reviewed by Kyle Garrett, licensed insurance advisorLast reviewed October 2026. How we write

“Morbidity” refers to the state of being diseased or unhealthy within a population. In medical and public health contexts, it encompasses the incidence, prevalence, and burden of diseases, illnesses, injuries, and disabilities in a specific population over a certain period. Morbidity rates are crucial indicators of public health and are used to identify the extent to which various health conditions affect a community, enabling healthcare providers, policymakers, and researchers to allocate resources, plan health services, and implement preventive measures effectively.

In the context of insurance, particularly health and disability insurance, morbidity rates are a critical factor in underwriting and determining premium rates. Insurers use statistical data on morbidity to assess the likelihood of policyholders incurring medical expenses or becoming disabled and needing to claim benefits. High morbidity rates for certain conditions or within certain demographic groups can lead to higher premiums for those at increased risk. Conversely, lower morbidity rates can contribute to lower insurance costs for the insured population.

Morbidity differs from mortality, which refers to the incidence of death within a population. While mortality rates provide insights into the lethality of diseases and overall life expectancy, morbidity rates offer a broader perspective on the population’s general health and quality of life, including the prevalence of chronic conditions and their impact on individuals’ daily activities and well-being.

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