Adverse effect of antiallergic and antiemetic drugs, sequela

This code signifies a long-term or residual condition resulting from an adverse reaction to antiallergic or antiemetic medications. These are effects that persist after the acute phase of the adverse event has resolved, indicating a permanent or chronic consequence.

Apply this code when documenting a patient presenting with a chronic or permanent sequela directly attributable to a past adverse effect of an antiallergic or antiemetic drug. Examples include persistent neurological deficits following an anaphylactic reaction to an antihistamine, or chronic liver damage from a past antiemetic overdose.

• Always sequence this code after the code describing the specific sequela (e.g., chronic hepatitis, peripheral neuropathy).
• Ensure documentation clearly links the current condition as a direct, lasting consequence of the prior adverse drug event.
• Do not use for acute adverse effects; those require an acute adverse effect code.