It is that time of year again when U.S. Medicare beneficiaries can make changes to their existing health-insurance plans or enroll as new clients during open enrollment period, and experts say not enough people are taking advantage of the opportunity.

Medicare open enrollment started Oct. 15 and ends Dec. 7. During this time, newly eligible people can enroll in health plans while about 1.5 million other seniors and participants in New Jersey can change their existing plans.