ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.3 > S66.31 > S66.319 S66.319 Strain of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level Non-Billable/Non-Specific Codes S66.319A..., initial encounterS66.319D..., subsequent encounterS66.319S..., sequela