Strain extensor musc/fasc/tend thmb at wrs/hnd lv, sequela

This code signifies a chronic or late effect of an injury to the extensor muscles, fascia, or tendons of an unspecified thumb, specifically at the wrist and hand level. It indicates that the initial injury has resolved, but the patient is experiencing residual symptoms or complications directly related to that past strain.

Use this code when documenting a patient presenting with ongoing pain, weakness, limited range of motion, or other persistent issues in the thumb extensor mechanism due to a previously sustained strain. This applies when the acute phase of the injury has passed, and the current encounter addresses the long-term consequences.

• Always use this code as a secondary diagnosis, following the primary code for the specific sequela (e.g., chronic pain, scar tissue).
• Ensure documentation clearly links the current condition to a past extensor thumb strain.
• Verify that the laterality of the thumb is truly unspecified in the medical record before applying this code.