Which of the following is NOT considered to be a type of PHI?

In the context of HIPAA, protected health information (PHI) refers to any information about an individual's health status, health care provision, or health care payment that can be linked to a specific individual. The key element of PHI is that it must relate to an individual's health or health care.

Employment history, while it may contain information that reflects upon an individual's work-related activities, generally does not include specific health-related information. It is not inherently connected to a person's medical condition or treatment, which is typically what qualifies as PHI under HIPAA guidelines. This distinguishes it from options like social security numbers, health insurance information, and emergency contact details, which can all be directly associated with an individual's health care.

Social security numbers and health insurance information directly relate to an individual's identity and health care coverage, making them critical components of PHI. Emergency contact details, while not health information themselves, are often collected in health care environments to facilitate communications about an individual’s health care and emergency situations.

Therefore, employment history stands out as not being classified as PHI according to HIPAA, as it lacks that direct connection to an individual's health or health care matters.