Inj extensor musc/fasc/tend r thm at wrs/hnd lv, sequela

This code signifies a long-term or late-effect condition resulting from a previous injury to the extensor muscles, fascia, or tendons of the right thumb, specifically at the wrist and hand level. This could include chronic pain, stiffness, weakness, or deformity that persists after the initial healing of the acute injury.

Use this code when documenting a patient presenting with residual symptoms or complications directly attributable to a past injury of the right thumb's extensor structures. This applies to follow-up encounters for conditions like chronic tenosynovitis, scar tissue formation limiting range of motion, or persistent weakness following a laceration or crush injury.

• Always link this sequela code to an external cause code (V00-Y99) if the original injury's cause is known and relevant.
• Ensure documentation clearly states the sequela nature of the condition, indicating it's a late effect rather than an acute injury.
• Do not use this code for acute injuries; instead, select an appropriate acute injury code from the S66.2 series.