Underdosing of antiepileptic and sed-hypntc drugs, init

This code indicates that a patient has experienced an adverse effect due to taking less than the prescribed or recommended dose of an antiepileptic or sedative-hypnotic medication not specified elsewhere. This underdosing has led to a new or worsening medical condition. The "A" at the end signifies that this is the initial encounter for the underdosing event.

Use this code when a patient presents with symptoms or a worsening of their underlying condition directly attributable to insufficient intake of their antiepileptic or sedative-hypnotic medication. This includes situations where the patient intentionally or unintentionally took less than prescribed, or when a medication shortage or error led to underdosing. This code is appropriate for the first time the underdosing is documented and treated.

• Always code the specific manifestation of the underdosing first, followed by this underdosing code.
• A Z91.1XX code (Patient's noncompliance with medical treatment and regimen) may be used as a secondary code if the underdosing was due to patient noncompliance.
• Ensure documentation clearly links the patient's current condition to the underdosing of the specified medication.