Protected health information

Protected health information includes all individually identifiable health information, including demographic data, medical histories, test results, insurance information, and other information used to identify a patient or provide healthcare services or healthcare coverage. ‘Protected’ means the information is protected under the Health Insurance Portability and Accountability Act (HIPAA) Privacy Rule. PHI is a subtype of personally identifiable information (PII).

Sourced From
HIPAA: What is Protected Health Information?
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NIH: De-identifying Protected Health Information Under the Privacy Rule
Rare Diseases Registry Program (RaDaR): Protect Human Research Participants