ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.2 > S66.21 > S66.211 S66.211 Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.211A..., initial encounterS66.211D..., subsequent encounterS66.211S..., sequela