sign, symptom, or diagnosis, it is appropriate to assign both the V code and the code describing the reason for the non-routine test. 18
The difference is in the types of non -nutritive sweeteners used. Diet Coke has aspartame while Coke Zero has a mix of aspartame and acesulfame potassium. The beverages have different levels of sweetness and off tastes (I.e. high levels of aspartame have a metallic taste) as a result.
Diet Coke contains 47mg of caffeine per 12 ounces (355ml) as does Diet Coke With Lime. Classic Coca-Cola, Coca-Cola Zero, and Coco-Cola Cherry each contain 37mg of caffeine per 12 ounces. The caffeine in soda varies between different brands.