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    v1.0.28
    OpenPayerBilling CodesNerve, nerve root and plexus disordersICD-10-CM g56-mononeuropathies-of-upper-limb
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    ICD-10-CM Code For Mononeuropathies Of Upper Limb: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G56 includes focal mononeuropathies of the upper limb, such as median nerve entrapment (carpal tunnel syndrome), ulnar nerve lesions, and radial nerve palsy that result from compression, trauma, or systemic disease. These ICD-10-CM diagnosis codes are used to document specific peripheral nerve involvement, symptom localization, and any associated sensory or motor deficits relevant to patient management. Accurate coding within the ICD-10-CM G56 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G56: Mononeuropathies Of Upper Limb Overview

    The ICD-10-CM G56 group covers focal neuropathies affecting peripheral nerves of the upper limb, such as carpal tunnel syndrome and ulnar nerve entrapment. These diagnoses target the peripheral nervous system and commonly involve sensory disturbance, motor weakness, or pain in the hand, wrist, forearm, or arm. Accurate coding matters for correct claim processing and to reflect clinical severity and service necessity for reimbursement.

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    When to Use

    Use codes from this group when documentation indicates a mononeuropathy of an upper limb nerve, such as median, ulnar, or radial nerve lesions, with specified laterality and clinical manifestations. Select the most specific code that matches the documented nerve, cause (if provided), and any associated features like neuropathic pain or muscle weakness.

    ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    G56.00Carpal tunnel syndrome, unspecified upper limb
    G56.01Carpal tunnel syndrome, right upper limb
    G56.02Carpal tunnel syndrome, left upper limb
    G56.03Carpal tunnel syndrome, bilateral upper limbs
    G56.10Other lesions of median nerve, unspecified upper limb
    G56.11Other lesions of median nerve, right upper limb
    G56.12Other lesions of median nerve, left upper limb
    G56.13Other lesions of median nerve, bilateral upper limbs
    G56.20Lesion of ulnar nerve, unspecified upper limb
    G56.21Lesion of ulnar nerve, right upper limb
    G56.22Lesion of ulnar nerve, left upper limb
    G56.23Lesion of ulnar nerve, bilateral upper limbs
    G56.30Lesion of radial nerve, unspecified upper limb
    G56.31Lesion of radial nerve, right upper limb
    G56.32Lesion of radial nerve, left upper limb
    G56.33Lesion of radial nerve, bilateral upper limbs
    G56.40Causalgia of unspecified upper limb
    G56.41Causalgia of right upper limb
    G56.42Causalgia of left upper limb
    G56.43Causalgia of bilateral upper limbs

    Showing 1–20 of 28

    DRG Codes

    2 rows

    DRG CodeDescription
    073Cranial and Peripheral Nerve Disorders with MCC
    074Cranial and Peripheral Nerve Disorders without MCC

    Typical Clinical Scenarios

    • An adult factory worker presents to urgent care with a 2-day history of acute numbness, tingling, and weakness in the lateral three digits and thumb of the dominant hand after repetitive use and wrist swelling. Exam shows thenar muscle weakness and positive Tinel sign at the wrist; electrodiagnostic testing confirms median nerve compression at the carpal tunnel. A diagnosis from this group is assigned for focal median mononeuropathy of the upper limb. Typical codes: G56.00, G56.01.
    • A middle-aged patient with long-standing poorly controlled diabetes reports gradual onset of bilateral hand numbness, nocturnal paresthesias, and intermittent hand weakness interfering with activities of daily living. Clinical assessment and nerve conduction studies reveal chronic entrapment neuropathy of the median nerve at the wrist consistent with chronic carpal tunnel syndrome. A code from this group is used to document chronic median mononeuropathy as a chronic neurologic complication. Typical codes: G56.02, G56.03.
    • A patient presents to the clinic several weeks after a distal radius fracture treated with immobilization, now complaining of focal numbness and pain in the radial distribution of the forearm and thumb, with sensory loss but preserved motor function; exam suggests isolated radial nerve branch involvement from the injury/immobilization. A mononeuropathy code from this group is assigned to document the post-traumatic focal nerve lesion as a complication of the upper extremity injury. Typical codes: G56.80, G56.81.

    Related Codes

    G50-DISORDERS-OF-TRIGEMINAL-NERVE

    ICD-10-CM Code For Disorders Of Trigeminal Nerve: Group Overview

    G51-FACIAL-NERVE-DISORDERS

    ICD-10-CM Code For Facial Nerve Disorders: Group Overview

    G52-DISORDERS-OF-OTHER-CRANIAL-NERVES

    ICD-10-CM Code For Disorders Of Other Cranial Nerves: Group Overview

    G53-CRANIAL-NERVE-DISORDERS

    ICD-10-CM Code For Cranial Nerve Disorders In Diseases Classified Elsewhere: Group Overview

    G54-NERVE-ROOT-AND-PLEXUS-DISORDERS

    ICD-10-CM Code For Nerve Root And Plexus Disorders: Group Overview

    G55-NERVE-ROOT-AND-PLEXUS-COMPRESSIONS

    ICD-10-CM Code For Nerve Root And Plexus Compressions In Diseases Classified Elsewhere: Group Overview

    G57-MONONEUROPATHIES-OF-LOWER-LIMB

    ICD-10-CM Code For Mononeuropathies Of Lower Limb: Group Overview

    G58-OTHER-MONONEUROPATHIES

    ICD-10-CM Code For Other Mononeuropathies: Group Overview

    G59-MONONEUROPATHY-IN-DISEASES

    ICD-10-CM Code For Mononeuropathy In Diseases Classified Elsewhere: 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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