Inj long flexor musc/fasc/tend thmb at wrs/hnd lv, subs

This code signifies an injury to the long flexor muscle, fascia, or tendon of the thumb, located at the wrist or hand level, that is not otherwise specified as a strain, laceration, or rupture. It indicates a subsequent encounter, meaning the patient is receiving follow-up care for an injury that has already been treated.

This code is appropriate for documenting follow-up visits for various non-specific thumb flexor injuries, such as contusions, sprains, or other ill-defined trauma to the long flexor structures. It should be used when the initial treatment has been rendered and the patient is returning for ongoing management, physical therapy, or re-evaluation.

• Ensure the documentation clearly specifies the injury is to the long flexor of the thumb and is located at the wrist or hand.
• Verify that this is a subsequent encounter, not an initial treatment or sequela.
• Avoid using this code if a more specific injury (e.g., S66.01- for strain, S66.02- for laceration, S66.03- for rupture) is documented.