Numerous reports describe how individual hospitals responded to the COVID-19 pandemic, but few describe how these changes occurred across a large public health system of care. As the early epicenter of the pandemic, New York State’s response, particularly the New York City metropolitan area, included a range of coordinated planning and regulatory efforts to preserve and create medical and intensive care unit capacity where needed; maintain access to acute psychiatric services; and redefine inpatient psychiatric care through strict infection control, easing of regulatory requirements, and use of telehealth. These strategies reflected similar efforts across the United States.