Underdosing of otorhino drugs and preparations, init

This code signifies a patient experiencing adverse effects or a lack of therapeutic response due to receiving an insufficient dose of medication intended for ear, nose, or throat conditions. This underdosing can lead to the persistence or worsening of the underlying condition.

Apply this code when documentation clearly indicates that a prescribed otorhinolaryngological drug was administered at a dose lower than therapeutically required, resulting in a negative clinical outcome. This is appropriate for the initial presentation of symptoms or complications directly attributable to the underdosing.

• Ensure documentation specifies the drug involved and the reason for underdosing (e.g., patient non-compliance, prescribing error, pharmacy error).
• This "initial encounter" seventh character (A) is used as long as the patient is receiving active treatment for the underdosing event.
• Always code the specific adverse effect or symptom resulting from the underdosing first, followed by this code.