Strain of flexor musc/fasc/tend finger at wrs/hnd lv, init

This code signifies a non-traumatic overstretching or tearing of the flexor muscles, their surrounding fascia, and/or tendons in any finger other than the thumb, occurring at the wrist or hand level. This injury typically results in pain, swelling, and limited range of motion in the affected finger.

Use this code for a new injury involving a strain of the flexor apparatus of a finger (excluding the thumb) in the hand or wrist region. This is appropriate for the initial treatment encounter for such an injury.

• Ensure documentation specifies "strain" and not a rupture or laceration, which would require a different code.
• Verify the affected finger is not the thumb; otherwise, a different S66.11- code is needed.
• Confirm this is the patient's initial encounter for this specific injury to justify the "A" seventh character.