The HIPAA guidelines outline 18 key identifiers of protected health information (PHI): 1. Patient names 2. Geographical elements (such as a street address, city, county, or zip code. 3. Dates related to the health or identity of individuals (including birthdates, date of admission or discharge, date of death, or exact age of a patient older than 89.) 4. Telephone numbers 5. Fax numbers 6. Email addresses 7. Social security numbers 8. Medical record numbers 9. Patient names 10. Geographical elements (such as a street address, city, county, or zip code. 11. Dates related to the health or identity of individuals (including birthdates, date of admission or discharge, date of death, or exact age of a patient older than 89.) 12. Telephone numbers 13. Fax numbers 14. Email addresses 15. Social security numbers 16. Medical record numbers