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Health care workers conduct LabCorp PCR COVID-19 testing off Dillon Rd. in Coachella, Calif. on Friday, May 1, 2020. The city of Coachella, Twentynine Palms Band of Mission Indians, Borrego Health, Desert Healthcare District and Foundation and the County of Riverside partnered to open the testing location. (Photo: Vickie Connor/The Desert Sun)

State and federal agents on Tuesday raided the offices of the Borrego Community Healthcare Foundation, a nonprofit provider with clinics in Riverside, San Diego and San Bernardino counties that last year billed more than $300 million in medical, dental and other services to the U.S. government.

Dozens of agents turned up at the organization’s Borrego Springs administrative offices first thing in the morning, seizing computers and boxes of medical records and interviewing employees who were not alerted to the search in advance.

Investigators also closed off the Borrego Medical Clinic a few miles to the