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.
In brief: In moderation. Coke zero is a diet coke product that uses aspartame as an artificial sweetner. In moderation, it is not harmful. I recommended no more than two per day to my patients. Consult with your doctor to see if you have other conditions that would not be conducive to taking coke zero. In brief: In moderation.