ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.2 > S66.29 > S66.291 S66.291 Other specified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.291A..., initial encounterS66.291D..., subsequent encounterS66.291S..., sequela