ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.0 > S66.00 > S66.001 S66.001 Unspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.001A..., initial encounterS66.001D..., subsequent encounterS66.001S..., sequela