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.
Coke just decided to rebrand Coke Zero as Coke Zero Sugar in the United States, and the effort has already been successful overseas, but the plan to rebrand with a new recipe and design hasn't been that well-received in the United States. The real problem is that Coca-Cola is fighting the decline in overall soda sales by reinventing at every turn. Diet Coke led to Coke Zero, which is now morphing into Coke Zero Sugar. On the one hand, that does help it offset the decline, but it also slows down the company's overall recovery on the beverages front.