See the parenthetical guidelines in the CPT book under Hydration, Therapeutic, Prophylactic, Diagnostic Injections and Infusions etc, just prior to 96360 for IV infusion for hydration. You can bill a separate E/M code with appropriate modifier if a significant, separately identifiable office or other outpatient E/M service is documented as performed. This is a CCI edit - the E/M code is a subset to the IV hydration, but is modifier eligible (if appropriately documented).
If a separate E/M service is documented, you would bill the appropriate E/M level with the correct modifier (for example) 99212-25, then 96360 x 1 unit for the 1st hour of IV hydration, with 96361 x 2 (additional 2 hours, total of 3) or 96361 x 3 (additional 3 hours, total of 4) depending on the time documented in the records.