S66.019 - Strain of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.0 - Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level S66.01 - Strain of long flexor muscle, fascia and tendon of thumb at wrist and hand level S66.019 - Strain of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level