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 made by Coca-Cola does not contain sodium benzoate, a change that was made voluntarily by the company in 2008. Coca-Cola's other drinks, including Fanta and Sprite, continue to use E211 in production. The company states that alternatives to E211 impact preservation and change the taste of the product.