VANCOUVER, Wash. (AP) — Washington Attorney General Bob Ferguson has reached a $1 million settlement with two Vancouver, Washington, dentists and their business over allegations that they defrauded Medicaid.

It is the second-largest resolution of a Medicaid False Claims Act case in Washington.

The dentists, Dr. Liem Do and his wife, Dr. Phuong-Oanh Tran, will have to repay $1 million to the state’s Medicaid fund. They used to operate four dental offices in Southwest Washington and two in Oregon. They now have a single clinic in Vancouver.

In addition to paying the settlement, Do has agreed to voluntarily exclude himself from participating in Medicaid and Medicare programs

Do and Tran remain licensed by the Department of Health as dentists.