We bill magnesium given for hypomagnesium as an infusion and add 275.2. There has been quite a bit of discussion and/or controversy over whether to bill MAG/KCL given with Cisplatin as hydration or infusion. When I first started 5 years ago, I was told to bill as hydration. However, hydration per CPT is defined as Pre-packaged fluid and electrolytes. After doing a considerable amount of inquiry with other practices, I found out they are all billing it as an infusion when MAG/KCL is being added to the saline. It makes sense to me so we are now billing it as infusion not hydration.