ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.0 > S56.00 > S56.002 S56.002 Unspecified injury of flexor muscle, fascia and tendon of left thumb at forearm level Non-Billable/Non-Specific Codes S56.002A..., initial encounterS56.002D..., subsequent encounterS56.002S..., sequela