Group health insurance policies work by pooling the risk and costs of medical care for a group of people. When an employer purchases a group health insurance policy, they pay a premium to the insurance company. The insurance company then pays for the medical expenses of the employees who are covered under the policy.
The cost of the policy is determined by a number of factors, including the age and health of the employees, the level of coverage offered, and the number of employees covered. In some cases, employees may be required to pay a portion of the premium or copayments for medical services.