Corrosion of mouth and pharynx, sequela

This diagnosis code indicates a long-term or residual effect resulting from a chemical burn or corrosive injury to the oral cavity or pharynx. These sequelae can include chronic pain, scarring, strictures, dysphagia, or other persistent functional impairments that developed after the initial acute injury has healed.

Apply this code when documenting conditions that are a direct consequence of a past corrosive ingestion or exposure affecting the mouth and throat. This is appropriate for follow-up encounters where the patient is being treated for the lasting impact of such an injury, rather than the acute burn itself.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., dysphagia, esophageal stricture).
• Ensure documentation clearly links the current condition to a previous corrosive injury of the mouth or pharynx.
• Do not use for acute corrosive burns; those require codes from the T28.0-T28.4 range.