Corrosions of unspecified ear drum, sequela

This code indicates a long-term or residual effect from a past corrosion injury to an unspecified ear drum. This could include chronic inflammation, scarring, or perforation that persists after the initial corrosive event has healed. The specific agent causing the corrosion is not identified.

Apply this code when documenting a patient presenting with a current sequela directly attributable to a previous corrosive injury of the eardrum, and the specific ear (right or left) is not documented. This code is appropriate for follow-up visits addressing these lasting complications, not the initial acute injury.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic otitis media).
• Ensure documentation clearly links the current condition to a past corrosive injury of the eardrum.
• Avoid using this code for acute corrosive injuries; instead, use the appropriate acute T28.91x codes with the correct seventh character.