Corrosion of first degree of left knee, sequela

This code signifies a first-degree corrosion (chemical burn) affecting the left knee, where the acute injury has healed, and the patient is now experiencing residual effects or complications from that past event. These sequelae could include scarring, chronic pain, or functional limitations directly attributable to the original chemical burn.

Use this code when documenting a patient encounter for the long-term effects or complications stemming from a first-degree chemical burn to the left knee that occurred in the past. This is appropriate for follow-up care related to the healed burn, not for the initial acute injury.

• Always ensure documentation clearly links the current condition to the past chemical burn of the left knee.
• This "S" seventh character indicates sequela, meaning the initial injury has healed, and the patient is experiencing residual effects.
• Do not use this code for acute or active chemical burns; refer to codes with "A" or "D" seventh characters for initial or subsequent encounters.