Unsp inj unsp musc/fasc/tend at wrs/hnd lv, l hand, sequela

This code signifies a long-term or late effect of an unspecified injury to the muscles, fascia, or tendons of the left wrist or hand. The original injury itself is not specified, and the current presentation is a residual condition or complication arising from that past trauma.

Apply this code when documentation indicates a sequela (e.g., chronic pain, stiffness, weakness, limited range of motion) in the left wrist or hand, directly attributable to an unspecified muscle, fascia, or tendon injury that occurred in the past. This code is appropriate when the specific nature of the original injury is unknown or not documented.

• Always sequence this code after the code for the specific sequela being treated (e.g., M25.542 for pain in left hand).
• Avoid using this code if the specific muscle, fascia, or tendon injured is known and documented; instead, use a more specific S66.x code with the appropriate seventh character.
• Ensure the documentation clearly supports a "sequela" encounter, indicating a residual condition from a past injury, not an acute injury.