Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes S00-T88 – Injury, poisoning and certain other consequences of external causes (S00-T88) > 2024 ICD-10-CM Codes S60-S69 – Injuries to the wrist, hand and fingers (S60-S69) > 2024 ICD-10-CM Codes S66 – Injury of muscle, fascia and tendon at wrist and hand level (S66) > 2024 ICD-10-CM Codes S66.2 – Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2) > 2024 ICD-10-CM Codes S66.21 – Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.21)