Any information, whether oral or recorded in any form or medium, that:
(1) Is created or received by a healthcare provider, health plan, public health authority, employer, life insurer, school or university, or healthcare clearinghouse; and
(2) Relates to the past, present, or future physical or mental health or condition of an individual; the provision of healthcare to an individual; or the past, present, or future payment for the provision of healthcare to an individual.
NIST SP 800-66 Rev. 1
(45 C.F.R., Sec. 160.103)