Adverse effect of otorhino drugs and preparations, sequela

This code signifies a long-term or residual condition resulting from a past adverse reaction to medications or preparations specifically used for the ear, nose, or throat. These sequelae are persistent health problems that arose after the initial acute adverse effect of the otorhinolaryngological drug has resolved.

Use this code when documenting a chronic or permanent health issue that is directly attributable to a previous adverse effect of an ENT-specific medication. Examples include persistent tinnitus following ototoxic ear drops, chronic nasal dryness after prolonged decongestant spray use, or permanent vocal cord damage from a past adverse reaction to a laryngeal anesthetic.

• Always sequence this code after the code for the specific sequela (e.g., tinnitus, chronic rhinitis).
• Ensure documentation clearly links the current condition to a past adverse effect of an ENT drug.
• Distinguish from acute adverse effects, which would use a different seventh character.