What does an EHR (electronic health record) contain?

An electronic health record (EHR) is designed to provide a comprehensive and unified view of a patient's medical history and care. It includes information collected from various healthcare providers and facilities, allowing for a complete picture of an individual’s health status and treatments over time. This means that B is the correct answer, as an EHR consolidates records from multiple practices and facilities, encompassing a range of data such as diagnoses, medications, treatment plans, immunization status, and test results.

This centralized access to patient information is crucial for improving the quality of care, reducing errors, and ensuring that healthcare professionals have the most relevant and current information for making clinical decisions. The interconnected nature of EHRs facilitates better coordination among providers, enhances patient safety, and improves communication across the healthcare system.

In contrast, the other options focus on more limited scopes of information. Records from a single practice do not capture the broader landscape of a patient's health history, while information on hospital staff does not pertain specifically to the patient's medical data. Lastly, while insurance claims and billing information can be part of clinical documentation, they do not encapsulate the entirety of what an EHR contains regarding patient health and treatment history.