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

This code signifies a non-traumatic overstretching or tearing of the extensor muscles, fascia, or tendons specifically located in an unspecified thumb, affecting the wrist and hand region. This injury typically results in pain, swelling, and impaired thumb movement.

Apply this code for initial encounters involving patients presenting with symptoms consistent with a new strain of the thumb extensor mechanism. This often occurs due to repetitive motion, sudden forceful movements, or overuse without direct impact.

• Ensure documentation specifies "strain" and not a sprain, tear, or rupture.
• Confirm the injury involves the extensor structures of the thumb at the wrist/hand level.
• This "A" suffix indicates an initial encounter for active treatment of the injury.