Poisoning by otorhino drugs and prep, accidental, sequela

This code signifies a long-term complication or residual effect resulting from an accidental overdose or improper use of medications specifically intended for the ear, nose, or throat. These sequelae are persistent conditions that arise after the acute phase of the poisoning has resolved. Examples include chronic hearing loss, persistent tinnitus, or permanent vestibular dysfunction caused by the initial poisoning event.

Use this code when documenting a patient presenting with a chronic or permanent health problem directly attributable to a past accidental poisoning by an ENT-specific drug. This applies when the acute poisoning event is no longer active, but its lasting consequences are being treated or evaluated. It is appropriate for conditions like drug-induced sensorineural hearing loss that developed after an unintentional ototoxic medication exposure.

• Always sequence this sequela code after the code for the specific residual condition (e.g., H90.5 for sensorineural hearing loss).
• Ensure documentation clearly links the current chronic condition to a past accidental poisoning by an otorhinolaryngological drug.
• Do not use this code for acute poisoning events; use the acute poisoning code with the appropriate seventh character for initial encounter.