The Office of Civil Rights (OCR) responsible for enforcement of HIPAA has issued an advisory on how HIPAA may apply to EMS and first-responders and interactions with health departments, covered entities, and dispatch. The advisory does not change the basic rules of exchange of PHI for Treatment, Payment, Operations, and as required by Law but provides examples of how these may apply in the current Covid crisis.
https://www.hhs.gov/sites/default/files/covid-19-hipaa-and-first-responders-508.pdf