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.
One liter of Coke Zero Sugar contains 96 mg caffeine. Additionally, artificial sweeteners are used. In the U.S., this includes aspartame and acesulfame potassium. However, the exact combination of sweeteners and preservatives used varies from market to market.