Final answer:
The Department of Health and Human Services (HHS) usually investigates hospital False Claims Act cases, specifically through its Office of Inspector General (OIG).
Step-by-step explanation:
The agency of the federal government that usually investigates hospital False Claims Act cases is the Department of Health and Human Services (HHS)
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HHS is responsible for enforcing federal healthcare laws and regulations, including the False Claims Act, which prohibits healthcare providers from submitting false or fraudulent claims to government healthcare programs such as Medicare and Medicaid.
Within the HHS, the primary agency responsible for investigating False Claims Act cases involving hospitals is the Office of Inspector General (OIG).