Adverse effect of unspecified narcotics, initial encounter

This code signifies an unintended, harmful reaction to a narcotic medication when taken as prescribed or directed. It indicates that the patient experienced an adverse effect, rather than an overdose or poisoning, from an unspecified narcotic substance. The "initial encounter" designation means the patient is receiving active treatment for the adverse effect.

Apply this code when a patient presents with symptoms directly attributable to a negative reaction to a narcotic medication they were legitimately taking, and the specific narcotic is not documented. This is appropriate for the first visit related to managing this adverse effect. Examples include unexpected drowsiness, nausea, or dizziness from a prescribed pain medication.

• Ensure documentation clearly states an "adverse effect" and not an overdose or poisoning.
• Only use this code for the initial phase of treatment for the adverse effect.
• Avoid this code if the specific narcotic is known; instead, use a more specific code from the T40.6- category.