Underdosing of antiepileptic and sed-hypntc drugs, subs

This code signifies a patient's underdosing of antiepileptic or sedative-hypnotic medications, excluding barbiturates and benzodiazepines, during an ongoing course of treatment. It indicates that the patient did not receive the prescribed amount of the drug, leading to potential therapeutic failure or symptom recurrence.

This code is appropriate for follow-up encounters where a patient presents with symptoms or complications directly related to insufficient intake of their prescribed antiepileptic or sedative-hypnotic medication. This could include a patient experiencing a breakthrough seizure due to missing doses or a patient with insomnia whose symptoms return because they are not taking enough of their sedative.

• Always assign an additional code for the specific manifestation or adverse effect of the underdosing (e.g., specific type of seizure).
• Ensure documentation clearly supports that the underdosing occurred during a subsequent encounter, not the initial presentation of the underdosing event.
• Distinguish this code from underdosing of barbiturates (T42.3X6-) or benzodiazepines (T42.4X6-).