Final answer:
The correct E/M code to report for a subsequent nursing facility visit with an expanded problem focused interval history, exam, and moderate decision making is code 99309. The other codes mentioned are for different levels of care or situations within a nursing facility.
Step-by-step explanation:
The clinical scenario presented describes a provider who performs an expanded problem focused interval history, an expanded problem focused exam, and moderate decision making for a nursing home patient with pneumonia and a UTI. The appropriate E/M (Evaluation and Management) code to report for this situation would be C. 99309, which is specific for subsequent nursing facility care.
The codes 99304, 99308, and 99318 are also related to nursing facility services, but they represent different levels of care or circumstances. Code 99304 is for the initial comprehensive assessment when a patient is first admitted to a nursing facility, code 99308 represents a subsequent nursing facility care visit that is problem-focused, whereas code 99318 is used for an annual nursing facility assessment. The case details suggest that an expanded problem focused visit was conducted with moderate decision making, which aligns with the requirements for reporting code 99309.