Nearly 200 people have been charged in a sweeping nationwide crackdown on health care fraud schemes with false claims topping $2.7 billion, the Justice Department said on Thursday.

Attorney General Merrick Garland announced the charges against doctors, nurse practitioners and others across the U.S. accused of a variety of scams, including a $900 million scheme in Arizona targeting dying patients.

In total, 193 people — including 76 doctors, nurse practitioners, and other licensed medical professionals — were charged in a series of separate cases brought over about two weeks in the nationwide health care fraud sweep. Authorities seized more than $230 million in cash, luxury cars and other assets. The Justice Department carries out these sweeping health care fraud efforts periodically to help deter other potential wrongdoers.

In another scheme targeting Native Americans, phony sober living homes were set up promising addiction treatment. Claims were then submitted for services that were never actually performed, officials said.