Final answer:
The correct CPT code for an ED visit with an expanded problem-focused history and examination limited by the patient's condition, with high MDM, is 99283.
Step-by-step explanation:
The question pertains to the appropriate level of Emergency Department (ED) service coding, specifically within the context of Current Procedural Terminology (CPT) codes used in the United States healthcare system. In this case, the service provided was an ED visit with an expanded problem-focused history and examination, which was limited due to the patient's medical condition but involved high medical decision making (MDM). With these factors, the correct CPT code would likely be B. 99283, which is assigned for an ED visit that includes an expanded problem-focused history and examination, and the MDM is of moderate complexity. Code 99282 is typically used for minor problems with straightforward MDM, and code 99284 is for more complex history and examination with moderate to high MDM. Code 99285 is for comprehensive history and examination with high MDM, which does not seem to be the case here since the examination was limited by the patient's condition.