Adverse effect of intravenous anesthetics, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic administration of an intravenous anesthetic agent. These reactions are not due to an overdose or poisoning, but rather an expected, albeit negative, side effect when the drug is given correctly. The "initial encounter" designation indicates that this is the first time the patient is receiving active treatment for this specific adverse effect.

Use this code when a patient presents with symptoms such as nausea, vomiting, allergic reaction, respiratory depression, or cardiovascular instability that are directly attributed to an intravenous anesthetic administered for a medical procedure. This applies when the anesthetic was given in the correct dosage and manner, but the patient still experienced an adverse outcome. It is appropriate for the initial visit where the adverse effect is diagnosed and managed.

• Always sequence this code after the code for the specific adverse effect (e.g., R58 for hemorrhage, T78.40XA for unspecified allergy).
• Ensure documentation clearly states the intravenous anesthetic as the cause of the adverse effect, distinguishing it from overdose or poisoning.
• Verify that the encounter is indeed the "initial" treatment for this specific adverse reaction; subsequent encounters would use the appropriate seventh character.