Underdosing of otorhino drugs and preparations, sequela

This code signifies a long-term consequence or complication arising from the insufficient administration of medications specifically used for ear, nose, and throat conditions. This underdosing occurred in the past, and the patient is now presenting with a residual effect directly attributable to that prior inadequate treatment.

Apply this code when a patient presents with a current health problem that is a direct and lasting result of having received too little of an ENT-related drug in the past. Examples include chronic ear infections due to insufficient antibiotic treatment, or persistent vertigo from inadequate medication for inner ear disorders. This code is for the sequela, not the acute underdosing event itself.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic otitis media).
• Ensure documentation clearly links the current condition to a past underdosing of an otorhinolaryngological drug.
• The "S" in the 7th character indicates a sequela, meaning the residual effect of a previous injury or disease.