HHS Secretary Xavier Becerra on Wednesday warned providers they must administer COVID-19 vaccines free to patients. In a letter to providers and insurers, Becerra said providers cannot require patients to get additional medical services to receive a vaccine or charge them a fee if a vaccine dose is the only medical service they provide. Instead, they can bill Medicare, Medicaid, private insurance or other health coverage to cover the costs of administering a vaccine. They can also bill the Health Resources and Services Administration if patients are uninsured or underinsured.