Open enrollment for the Commonwealth Care program began on Wednesday and will continue through June 24. It is the only time during the year when members may change health plans for any reason.

“We will give members all the information and support they need to choose a health plan that best meets their needs,” said the executive director of the Commonwealth Health Insurance Connector Authority, Glen Shor. “Members should carefully review the material we’ve sent them to see how changes in premiums and provider networks may affect them.”

Changes made take effect July 1.

There are 159,000 people enrolled in the subsidized plan for people earning up to 300 percent of the federal poverty level ($32,676 for an individual and $67,056 for a family of four) who are not offered employer-sponsored insurance. Approximately one-half of them pay monthly premiums.

All plans cover the same medical benefits and also offer extra services, such as programs for weight loss or rewards for health behaviors. Networks may vary by insurance carrier and where you live.

Members may make their changes on the Health Connector’s Web site,, or by calling the Commonwealth Care service center at 1-877-MA-ENROLL Monday through Friday from 8 a.m. to 5 p.m. Members can also make their selection on the form they received in the mail.

Managed care organizations with plans in the Commonwealth Care program are BMC HealthNet, CeltiCare, Fallon Community Health Plan, Neighborhood Health Plan and Network Health.