Underdosing of mixed antiepileptics, initial encounter

This code signifies a patient experiencing adverse effects or complications due to receiving an insufficient amount of a combination of antiepileptic medications. This underdosing can lead to a recurrence or worsening of seizure activity, or other symptoms related to inadequate seizure control.

Apply this code when a patient presents with symptoms or conditions directly attributable to not receiving the prescribed or necessary dose of multiple antiepileptic drugs. This is appropriate for the initial visit where the underdosing is identified and managed. Examples include a patient presenting with breakthrough seizures due to missed doses of their combination therapy.

• Ensure documentation clearly states "underdosing" and specifies "mixed antiepileptics."
• Verify this is the initial encounter for the underdosing event; subsequent encounters would use a different seventh character.
• Always code the specific adverse effect or symptom resulting from the underdosing as a secondary diagnosis.