Corrosion of first degree of left thumb (nail), sequela

This code indicates a first-degree corrosion (chemical burn) affecting the left thumb, specifically including the nail, where the initial injury has healed but is still causing ongoing problems or conditions. A first-degree corrosion involves only the outermost layer of skin, similar to a superficial burn, but is caused by chemical exposure. The "sequela" designation means the code is used to report the long-term effects or complications of this past injury.

This code is appropriate when documenting a patient presenting with a current condition or symptom that is a direct result of a previously sustained first-degree chemical burn to their left thumb, including the nail. Examples include chronic pain, scarring, nail deformity, or altered sensation directly attributable to the past corrosion. It should not be used for the initial acute injury.

• Always ensure documentation clearly links the current condition to the past first-degree corrosion of the left thumb.
• Do not use this code for acute or active corrosion; use the appropriate acute corrosion code for the initial injury.
• Verify the laterality (left) and specific body part (thumb, including nail) are accurately documented to support this specific code.