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    OpenPayerBilling CodesInjuries to the wrist, hand and fingersICD-10-CM s66-injury-of-muscle-fascia-and-tendon
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    ICD-10-CM Code For Injury Of Muscle Fascia And Tendon At Wrist And Hand Level: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group S66 includes traumatic injuries to muscles, fascia, and tendons at the wrist and hand level, covering lacerations, tears, and other disruptions of soft tissue structures in the distal upper extremity. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving acute soft tissue trauma to the wrist and hand, capturing details about the type of injury, laterality, and associated complications. Accurate coding within the ICD-10-CM S66 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM S66: Injury Of Muscle, Fascia And Tendon At Wrist And Hand Level Overview

    The diagnoses in this group represent traumatic injuries to muscles, fascia, and tendons located at the wrist and hand, including partial and complete tears, lacerations, and traumatic disruptions. These codes target the musculoskeletal and soft tissue structures of the distal upper extremity and are used to document the nature and location of the injury. Accurate coding matters for appropriate claim adjudication and to reflect the complexity of care and resource utilization required for treatment.

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    When to Use

    Use a code from this group when clinical documentation identifies an acute or traumatic injury to a muscle, fascia, or tendon at the wrist or hand. Select the code that matches the specific structure affected, the laterality, and any documented complications to ensure accurate reporting.

    ICD-10-CM Codes

    540 rows

    ICD-10-CM CodeDescription
    S66.001AUnspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
    S66.001DUnspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
    S66.001SUnspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, sequela
    S66.002AUnspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
    S66.002DUnspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
    S66.002SUnspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, sequela
    S66.009AUnspecified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
    S66.009DUnspecified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
    S66.009SUnspecified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
    S66.011AStrain of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
    S66.011DStrain of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
    S66.011SStrain of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, sequela
    S66.012AStrain of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
    S66.012DStrain of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
    S66.012SStrain of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, sequela
    S66.019AStrain of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
    S66.019DStrain of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
    S66.019SStrain of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
    S66.021ALaceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
    S66.021DLaceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter

    Showing 1–20 of 540

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    DRG Codes

    14 rows

    DRG CodeDescription
    562Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC
    563Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC
    564Other Musculoskeletal System and Connective Tissue Diagnoses with MCC
    565Other Musculoskeletal System and Connective Tissue Diagnoses with CC
    566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC
    604Trauma to the Skin, Subcutaneous Tissue and Breast with MCC
    605Trauma to the Skin, Subcutaneous Tissue and Breast without MCC
    913Traumatic Injury with MCC
    914Traumatic Injury without MCC
    949Aftercare with CC/MCC
    950Aftercare without CC/MCC
    963Other Multiple Significant Trauma with MCC
    964Other Multiple Significant Trauma with CC
    965Other Multiple Significant Trauma without CC/MCC

    Typical Clinical Scenarios

    • A middle-aged construction worker presents to the emergency department after a crushing hand injury when a heavy door closed on his palm and volar wrist. He has acute pain, swelling, and inability to actively flex several fingers; imaging shows tendon disruption at the level of the wrist with open laceration. A diagnosis from this group is assigned to capture the acute traumatic injury to muscle, fascia or tendon at the wrist/hand requiring urgent surgical evaluation. Typical codes: S66.101A, S66.102A
    • An elderly nursing home resident with progressive weakness of finger flexion and pain months after a distal forearm contusion now attends outpatient clinic for persistent functional loss and scar-related tethering of flexor tendons. The visit documents chronic stiffness and reduced range of motion from healed soft-tissue injury and tendon adhesions; a code from this group is used to reflect the sequela or ongoing impairment of tendon/muscle function at the wrist/hand level. Typical codes: S66.101D, S66.109D
    • A young adult basketball player presents for follow-up two weeks after operative repair of torn extensor tendons at the dorsal wrist sustained during a game. The postoperative visit documents routine wound check, suture removal, and early rehabilitation, and the encounter is coded to indicate the recent injury and current encounter for care of the tendon repair. Typical codes: S66.101S, S66.102S

    Related Codes

    S60-SUPERFICIAL-INJURY-OF-WRIST-HAND-FINGERS

    ICD-10-CM Code For Superficial Injury Of Wrist Hand And Fingers: Group Overview

    S61-OPEN-WOUND-OF-WRIST-HAND-FINGERS

    ICD-10-CM Code For Open Wound Of Wrist Hand And Fingers: Group Overview

    S62-FRACTURE-AT-WRIST-AND-HAND-LEVEL

    ICD-10-CM Code For Fracture At Wrist And Hand Level: Group Overview

    S63-DISLOCATION-AND-SPRAIN-WRIST-HAND

    ICD-10-CM Code For Dislocation And Sprain Of Joints And Ligaments At Wrist And Hand Level: Group Overview

    S64-INJURY-OF-NERVES-AT-WRIST-AND-HAND-LEVEL

    ICD-10-CM Code For Injury Of Nerves At Wrist And Hand Level: Group Overview

    S65-INJURY-OF-BLOOD-VESSELS-WRIST-HAND

    ICD-10-CM Code For Injury Of Blood Vessels At Wrist And Hand Level: Group Overview

    S67-CRUSHING-INJURY-OF-WRIST-HAND-FINGERS

    ICD-10-CM Code For Crushing Injury Of Wrist Hand And Fingers: Group Overview

    S68-TRAUMATIC-AMPUTATION-WRIST-HAND-FINGERS

    ICD-10-CM Code For Traumatic Amputation Of Wrist Hand And Fingers: Group Overview

    S69-OTHER-AND-UNSPECIFIED-WRIST-HAND-INJURIES

    ICD-10-CM Code For Other And Unspecified Injuries Of Wrist Hand And Finger(S): Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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