Corros 3rd deg mu sites of shldr/up lmb, ex wrs/hnd, sqla

This code indicates a third-degree corrosion (chemical burn) affecting multiple areas of the shoulder and upper limb, excluding the wrist and hand. It signifies a deep tissue injury resulting from chemical exposure, with the "S" suffix denoting that this is a sequela, meaning it represents a late effect or complication of the initial injury.

Apply this code when documenting the long-term effects or complications arising from a third-degree chemical burn to multiple sites of the shoulder and upper arm, forearm, or elbow. This is appropriate for follow-up encounters after the initial acute injury has healed, but residual issues related to the corrosion persist.

• Ensure documentation clearly states "third-degree corrosion" and specifies multiple affected sites within the shoulder and upper limb (excluding wrist/hand).
• The "S" suffix mandates that this code is used for sequelae, not for the initial acute injury.
• Always code the specific chemical agent responsible for the corrosion, if known, using an external cause code.