Adverse effect of antieplptc and sed-hypntc drugs, sequela

This code signifies a long-term or residual adverse effect resulting from the therapeutic use of an antiepileptic or sedative-hypnotic medication not specifically classified elsewhere. It indicates that the initial acute adverse reaction has resolved, but a lasting health problem or complication persists due to the drug.

Apply this code when a patient presents with a chronic condition, disability, or permanent damage directly attributable to a past adverse reaction to an antiepileptic or sedative-hypnotic drug. Examples include persistent neurological deficits after drug-induced encephalopathy, or chronic organ damage from a previously resolved drug toxicity.

• Always sequence this code after the code(s) for the specific sequela or residual condition.
• Ensure documentation clearly links the current, chronic condition to a past adverse effect of an antiepileptic or sedative-hypnotic drug.
• Do not use this code for acute adverse effects; use the appropriate acute adverse effect code (e.g., T42.6X5A) for current, active reactions.