California signed up an estimated 450,000 people under Medicaid expansion who may not have been eligible for coverage, according to a report by the U.S. Health and Human Services’ chief watchdog.

In a Feb. 21 report, the HHS’ inspector general estimated that California spent $738.2 million on 366,078 expansion beneficiaries who were ineligible. It spent an additional $416.5 million for 79,055 expansion enrollees who were “potentially” ineligible, auditors found.

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