Well, let me add to the infusion confusion. CPT describes hydration to consist of a pre-packaged fluid and electrolytes (eg, normal saline, D5 1/2 NS with 30 mEq KCL/liter) but are not used to report infusion of drugs or other substances. Because it is not cost-effecient to stock IVFs with varying amounts of KCL (manufacturers only make a few solutions, anyway) and some docs will order 15 mEq, 40 mEq KCL for their hydration orders, pharmacy will mix these bags. I still consider them hydration. It is when the potassium is being replaced with KCL in a smaller volume of solution, it is considered therapeutic because it is given to replace electrolytes, not to hydrate the patient. Some other therapeutic replacement infusions of electrolytes contain calcium, phosphorus or magnesium sulfate.
Banana bags, usually a liter of fluids with thiamine, folic acid, magnesium sulfate and MVI (turns the IVF yellow) is a therapeutic infusion. These are mixed by pharmacy. There are many premixed infusions: antibiotics, Dopamine, Heparin, Lidocaine, Zantac... They are therapeutic to treat a condition not to hydrate the patient. If you have any doubts just post and we can help you determine if the infusion is hydration or therapeutic.