Adverse effect of unspecified anesthetic, initial encounter

This code signifies an undesirable or harmful reaction to an anesthetic agent where the specific drug is not identified, and the reaction occurred despite proper administration. It indicates the patient experienced an adverse effect rather than an overdose or poisoning.

Apply this code when a patient presents with symptoms such as nausea, vomiting, dizziness, or allergic reactions that are directly attributable to an anesthetic, but the exact anesthetic agent is unknown. This is appropriate for the initial encounter for treatment of the adverse effect.

• Ensure documentation clearly states an adverse effect, not an overdose or poisoning.
• Only use this code when the specific anesthetic agent cannot be identified.
• Pair with an external cause code (Y-code) to specify the intent and circumstances, if known.