Health insurance isn agreement between a patient and a healthcare provider, stating that the patient will pay for all medical expenses. an agreement between a healthcare provider and a health insurance company, stating that the health insurance company will pay a portion of the provider's medical expenses. an agreement between a patient and a health insurance company, stating that the health insurance company will pay a portion of the patient's medical expenses. an agreement between a patient and a health care provider, stating that the health care provider will pay for all of the medical expenses.