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.
While Coke Zero does not contain any calories, fat, carbohydrates, cholesterol or sugars, it also provides no nutritional benefits. The drink does not contain any protein, fiber, vitamin C, vitamin A, calcium or iron.