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    OpenPayerBilling CodesInjuries to the ankle and footICD-10-CM s99-other-and-unspecified-injuries-ankle-foot
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    ICD-10-CM Code For Other And Unspecified Injuries Of Ankle And Foot: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group S99 includes traumatic injuries of the ankle and foot that are classified as other or unspecified, such as non-specific soft tissue injuries, unspecified fractures, and other localized traumatic conditions not captured elsewhere. These ICD-10-CM diagnosis codes are used to document acute traumatic presentations, capture the injured anatomical structures, and indicate the level of specificity available in clinical documentation. Accurate coding within the ICD-10-CM S99 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM S99: Other And Unspecified Injuries Of Ankle And Foot Overview

    The ICD-10-CM S99 group includes other and unspecified injuries to the bones, joints, ligaments, tendons, nerves, and soft tissues of the ankle and foot. These codes apply to acute traumatic injuries that do not fit into more specific ankle and foot injury categories. Accurate coding matters for reimbursement because it ensures claims reflect the clinical complexity and site of injury, supporting appropriate payment and continuity of care.

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    When to Use

    Use a code from this group when treating or documenting an acute ankle or foot injury that cannot be classified to a more specific ICD-10-CM code due to the nature of the injury or lack of detail in documentation. These codes apply in clinical scenarios where the anatomical site is the ankle or foot and the injury is traumatic but unspecified or described as other than standard, well-defined injury types.

    ICD-10-CM Codes

    414 rows

    ICD-10-CM CodeDescription
    S99.001AUnspecified physeal fracture of right calcaneus, initial encounter for closed fracture
    S99.001BUnspecified physeal fracture of right calcaneus, initial encounter for open fracture
    S99.001DUnspecified physeal fracture of right calcaneus, subsequent encounter for fracture with routine healing
    S99.001GUnspecified physeal fracture of right calcaneus, subsequent encounter for fracture with delayed healing
    S99.001KUnspecified physeal fracture of right calcaneus, subsequent encounter for fracture with nonunion
    S99.001PUnspecified physeal fracture of right calcaneus, subsequent encounter for fracture with malunion
    S99.001SUnspecified physeal fracture of right calcaneus, sequela
    S99.002AUnspecified physeal fracture of left calcaneus, initial encounter for closed fracture
    S99.002BUnspecified physeal fracture of left calcaneus, initial encounter for open fracture
    S99.002DUnspecified physeal fracture of left calcaneus, subsequent encounter for fracture with routine healing
    S99.002GUnspecified physeal fracture of left calcaneus, subsequent encounter for fracture with delayed healing
    S99.002KUnspecified physeal fracture of left calcaneus, subsequent encounter for fracture with nonunion
    S99.002PUnspecified physeal fracture of left calcaneus, subsequent encounter for fracture with malunion
    S99.002SUnspecified physeal fracture of left calcaneus, sequela
    S99.009AUnspecified physeal fracture of unspecified calcaneus, initial encounter for closed fracture
    S99.009BUnspecified physeal fracture of unspecified calcaneus, initial encounter for open fracture
    S99.009DUnspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with routine healing
    S99.009GUnspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with delayed healing
    S99.009KUnspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with nonunion
    S99.009PUnspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with malunion

    Showing 1–20 of 414

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    DRG Codes

    7 rows

    DRG CodeDescription
    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

    • An adult presents to the emergency department after twisting their ankle during a fall while hiking; they have localized pain, swelling, and limited ability to bear weight, and plain radiographs show no fracture but there is suspicion of a significant soft tissue injury to the ankle/foot requiring immobilization and close follow‑up. A code from this group is assigned for an acute, unspecified injury to the ankle/foot when specific tendon, ligament, or fracture codes are not applicable. Typical codes: S99.011A, S99.021A
    • An elderly nursing home resident with peripheral neuropathy develops progressive foot instability and sustained bruising and swelling after repeated minor trauma over weeks; the patient is evaluated in clinic for chronic, nonhealing soft tissue injury of the foot that is interfering with mobility and wound care. A code from this group is used to capture an ongoing, non‑acute unspecified ankle/foot injury as part of the chronic care plan and rehabilitation documentation. Typical codes: S99.019D, S99.029D
    • A patient is admitted post‑operatively to the hospital with an infected wound and cellulitis over a previously injured ankle that occurred earlier but now presents with acute exacerbation and systemic signs; the current visit documents complications of the prior unspecified ankle/foot injury requiring inpatient antibiotic therapy and surgical debridement. A code from this group is assigned to reflect the original unspecified ankle/foot injury as affected by the current complication. Typical codes: S99.009G, S99.039G

    Related Codes

    S90-SUPERFICIAL-INJURY-OF-ANKLE-FOOT-TOES

    ICD-10-CM Code For Superficial Injury Of Ankle Foot And Toes: Group Overview

    S91-OPEN-WOUND-OF-ANKLE-FOOT-TOES

    ICD-10-CM Code For Open Wound Of Ankle Foot And Toes: Group Overview

    S92-FRACTURE-OF-FOOT-AND-TOE

    ICD-10-CM Code For Fracture Of Foot And Toe Except Ankle: Group Overview

    S93-DISLOCATION-AND-SPRAIN-ANKLE-FOOT-TOE

    ICD-10-CM Code For Dislocation And Sprain Of Joints And Ligaments At Ankle, Foot And Toe Level: Group Overview

    S94-INJURY-OF-NERVES-ANKLE-FOOT

    ICD-10-CM Code For Injury Of Nerves At Ankle And Foot Level: Group Overview

    S95-INJURY-OF-BLOOD-VESSELS-ANKLE-FOOT

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

    S96-INJURY-OF-MUSCLE-AND-TENDON-ANKLE-FOOT

    ICD-10-CM Code For Injury Of Muscle And Tendon At Ankle And Foot Level: Group Overview

    S97-CRUSHING-INJURY-OF-ANKLE-AND-FOOT

    ICD-10-CM Code For Crushing Injury Of Ankle And Foot: Group Overview

    S98-TRAUMATIC-AMPUTATION-OF-ANKLE-AND-FOOT

    ICD-10-CM Code For Traumatic Amputation Of Ankle And Foot: 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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