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    OpenPayerBilling CodesNerve, nerve root and plexus disordersICD-10-CM g59-mononeuropathy-in-diseases
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    ICD-10-CM Code For Mononeuropathy In Diseases Classified Elsewhere: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G59 includes mononeuropathies that are manifestations of diseases classified elsewhere, such as diabetic mononeuropathy, compressive neuropathies due to neoplasm, or neuropathies related to infectious and inflammatory conditions. These ICD-10-CM diagnosis codes are used to document focal peripheral nerve dysfunction tied to an underlying systemic or localized disease process, capturing the nerve involved and the association with the primary disorder. Accurate coding within the ICD-10-CM G59 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G59: Mononeuropathy In Diseases Classified Elsewhere Overview

    This code group captures mononeuropathies that occur as manifestations of other systemic diseases, affecting peripheral nerves supplied to a specific anatomic distribution. These conditions involve single-nerve dysfunction secondary to an underlying illness such as metabolic, infectious, inflammatory, or neoplastic disorders. Accurate coding links the neurologic deficit to the primary disease process and supports correct claim adjudication and clinical documentation for reimbursement.

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    When to Use

    Use a code from this group when a single peripheral nerve deficit is documented as being caused by or associated with another identifiable disease process recorded elsewhere in the medical record. Select the specific G59 code that indicates the affected nerve and ensure linkage to the primary disease code to reflect the causal relationship.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    G59Mononeuropathy in diseases classified elsewhere

    DRG Codes

    2 rows

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

    Typical Clinical Scenarios

    • A 55-year-old patient with long-standing diabetes mellitus presents with progressive numbness, burning pain, and focal weakness localized to the ulnar distribution of the right hand over several months, worse at night and interfering with grip. The clinician documents focal mononeuropathy related to the patient’s systemic disease after nerve conduction studies confirm isolated ulnar nerve involvement; a code from this group is assigned as the neuropathy is due to an underlying systemic condition. Typical codes: G59
    • A 40-year-old patient with newly diagnosed sarcoidosis develops subacute left facial weakness and paresthesia over two weeks, prompting urgent outpatient evaluation; workup attributes the focal cranial neuropathy to granulomatous infiltration from the systemic disease. Because the peripheral nerve impairment is a mononeuropathy occurring in the context of a disease classified elsewhere, a code from this group is used to capture that relationship. Typical codes: G59
    • A 68-year-old patient hospitalized for chemotherapy for a solid tumor reports acute onset of foot drop and loss of ankle dorsiflexion on the right side during the inpatient stay; exam and electrodiagnostic testing localize the deficit to the common peroneal nerve and the oncology team documents the neuropathy as secondary to chemotherapeutic neurotoxicity. The diagnosis code from this group is assigned to indicate a focal neuropathy attributable to the patient’s systemic treatment-related condition. Typical codes: G59

    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

    G56-MONONEUROPATHIES-OF-UPPER-LIMB

    ICD-10-CM Code For Mononeuropathies Of Upper Limb: 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

    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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