Injury of ulnar nerve at upper arm level, left arm, sequela

This code signifies a long-term or late-effect complication resulting from a previous injury to the ulnar nerve in the left upper arm. These sequelae can manifest as persistent pain, weakness, numbness, or other neurological deficits that developed after the initial acute injury has resolved.

Apply this code when documenting conditions like chronic ulnar neuropathy, muscle atrophy, or contractures in the left hand/forearm that are directly attributable to an old injury of the ulnar nerve at the upper arm level. This is appropriate for follow-up encounters where the initial injury is no longer acute but its lasting effects are being treated.

• Always sequence this "S" code after the code describing the specific sequela (e.g., G56.2 for ulnar nerve lesion).
• Ensure documentation clearly links the current condition to a past ulnar nerve injury in the left upper arm.
• Verify the "S" seventh character for sequela is appropriate, indicating a late effect rather than an acute injury.