Underdosing of unsp antiepileptic and sed-hypntc drugs, init

This code signifies a patient experiencing adverse effects or a worsening of their condition due to taking less than the prescribed or recommended dose of an antiepileptic or sedative-hypnotic medication, where the specific drug is not documented. The "initial encounter" designation indicates that the patient is receiving active treatment for the underdosing event.

Use this code when a patient presents with symptoms related to insufficient intake of an antiepileptic or sedative-hypnotic drug, and the specific medication is unknown or not specified in the medical record. This is appropriate for the first time the patient is seen for this particular underdosing episode. Examples include uncontrolled seizures due to missed antiepileptic doses or increased anxiety/insomnia due to insufficient sedative-hypnotic intake.

• Always sequence this code after the code(s) for the specific condition being treated (e.g., epilepsy, anxiety) that is exacerbated by the underdosing.
• Only use the "initial encounter" extension (A) for the first visit related to this underdosing episode. Subsequent visits for the same underdosing should use the appropriate subsequent (D) or sequela (S) encounter codes.
• If the specific antiepileptic or sedative-hypnotic drug is known, a more specific underdosing code from categories T42.0-T42.6 should be used instead.