What defines an electronic health record (EHR)?

An electronic health record (EHR) is characterized as a digital version of a patient's medical chart. This system not only stores comprehensive patient histories but also allows for easy access and sharing of information among authorized healthcare providers. By providing a complete, updated, and organized representation of patient data, EHRs enhance coordination of care, improve health outcomes, and support more efficient healthcare delivery.

The other options don't fit the definition of an EHR. A paper document of patient history refers to traditional, non-digital records, while a summary of patient billing information focuses solely on financial aspects rather than the complete medical profile. A physical storage system for records, while pivotal for certain record-keeping systems, does not capture the electronic and integrated nature of an EHR. Thus, the correct answer highlights the essential features and purpose of electronic health records.