Which of the following is NOT a level of History (Hx)?

In the context of medical coding, particularly within the Evaluation and Management (E/M) guidelines, history (Hx) is categorized into specific levels which dictate the complexity and detail required for documentation. The levels of history include:

• Comprehensive: This involves a thorough collection of information about the patient’s medical history, including past medical, family, and social histories, as well as detailed reviews of systems.

• Detailed: This level requires a more in-depth history than a problem-focused approach, including an extensive review of the patient's history related to the present illness and a more systematic review of systems.

• Problem-focused: This is the most basic level of history and typically includes only the history directly relevant to the presenting problem.

"Differentiated" is not recognized as a level of history in the E/M documentation guidelines, making it the selection that does not fit within the established categories. Understanding these levels is crucial for accurate coding and compliance with billing regulations in the cardiothoracic surgery context.