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

This code signifies a long-term complication or residual effect stemming from an unspecified injury to muscles, fascia, or tendons in the wrist or hand. The original injury's specific nature or the exact muscle/tendon involved is not documented, and the affected hand is also unspecified. This indicates a persistent issue rather than an acute injury.

Use this code when a patient presents with a sequela (e.g., chronic pain, weakness, limited range of motion, scar tissue) in the wrist or hand that is clearly attributed to a past, unspecified injury of the soft tissues. This is appropriate when the initial injury is no longer active and the current encounter addresses the lasting effects.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic pain, contracture).
• Avoid using this code for acute injuries; it is strictly for residual conditions.
• If the specific muscle, tendon, or hand is known, a more precise S66.xxxS code should be selected.