Corrosion of unspecified degree of left ankle, sequela

This code indicates a long-term complication or late effect resulting from a corrosive chemical burn to the left ankle. It signifies that the acute phase of the injury has passed, but the patient continues to experience residual issues directly attributable to the original chemical exposure, such as scarring, chronic pain, or functional impairment. The specific degree of the original burn is not documented or is unknown.

Apply this code when documenting follow-up care for a patient whose left ankle sustained a chemical burn in the past, and they are now presenting with persistent problems related to that injury. This includes situations where the patient is being treated for scar contractures, chronic dermatitis, nerve damage, or other lasting effects of the corrosion. Do not use for the initial acute treatment of the burn.

• Always assign an external cause code (V00-Y99) to describe the circumstances of the corrosion.
• Use this code as a secondary diagnosis when treating the sequela; a code for the specific manifestation of the sequela (e.g., scar, chronic ulcer) should be primary.
• Ensure documentation clearly links the current condition to a past corrosive injury of the left ankle.