A licensed clinical social worker has been sentenced to 21 months in federal prison for her role in a health care fraud scheme involving two companies that operated in the Alexandria area, U.S. Attorney Walt Green said Wednesday.

Carla M. Clark, 50, of Pine-ville, also was ordered by Chief U.S. District Judge Brian Jackson to pay more than $413,000 in restitution to the U.S. Department of Health and Human Services/Centers for Medicare and Medicaid Services.

The companies involved in the scheme were Fusion Services LLC and Grace Social Services LLC, both owned by Sonya Lewis Williams, Green said.

Williams, of Baton Rouge, was sentenced in 2013 to 37 months in prison for health care fraud and money laundering and ordered to pay more than $1.2 million in restitution. Fusion and Grace were not charged.

Clark worked with Williams and participated in creating false and misleading medical records for Fusion indicating that Medicare beneficiaries had received individual, face-to-face psychotherapy when no such services had been provided, Green said. Williams then prepared false claims for the purported psychotherapy services to elderly patients and submitted them to Medicare for reimbursement, he said.

Medicare paid Fusion and Grace nearly $350,000 as a result of the billings. Much of the profits were deposited into Williams’ personal accounts, Green said.

Another licensed clinical social worker, Lillie Lavan, of Pineville, was previously sentenced to 27 months in prison and ordered to pay restitution of more than $115,000. Lavan worked with Fusion.