Adverse effect of other narcotics, subsequent encounter

This code signifies a patient experiencing a harmful or undesirable reaction to a narcotic medication other than opium, heroin, or other specified opioids, during a follow-up visit for the adverse effect. This reaction is not due to poisoning, overdose, or improper use, but rather an expected or unexpected side effect of the drug when administered correctly.

Apply this code when a patient presents for ongoing management or evaluation of an adverse effect from a narcotic (e.g., codeine, hydrocodone, oxycodone) that was prescribed and taken as directed. This is appropriate for subsequent encounters after the initial diagnosis and treatment of the adverse reaction.

• Always sequence this code after the code for the specific adverse effect (e.g., nausea, rash).
• Ensure documentation clearly states the narcotic involved and that the encounter is for follow-up care of the adverse effect.
• Distinguish from poisoning (T40.6X1-T40.6X4) or underdosing (T40.6X6) which have different code categories.