ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.0 > S66.09 > S66.099 S66.099 Other specified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.099A..., initial encounterS66.099D..., subsequent encounterS66.099S..., sequela