Final answer:
The appropriate code for a returning patient who receives an EKG, chest Xray, IV, and nitroglycerin is 99215.
Step-by-step explanation:
The appropriate code for a returning patient who receives an EKG, chest Xray, IV, and nitroglycerin would be 99215. This code represents an evaluation and management (E/M) service for an established patient with a high complexity level of medical decision making. The services provided, such as the EKG, chest Xray, IV, and nitroglycerin, contribute to the overall complexity of the encounter.