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    OpenPayerBilling CodesDiseases of myoneural junction and muscleICD-10-CM g70-myasthenia-gravis-and-myoneural-disorders
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    ICD-10-CM Code For Myasthenia Gravis And Other Myoneural Disorders: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G70 includes myasthenia gravis, congenital myasthenic syndromes, and other disorders of the myoneural junction and muscle that impair neuromuscular transmission and muscle strength. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as fluctuating muscle weakness, bulbar involvement, respiratory compromise, or congenital transmission defects, capturing disease severity and organ system impact. Accurate coding within the ICD-10-CM G70 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G70: Myasthenia Gravis And Other Myoneural Disorders Overview

    The ICD-10-CM G70 diagnoses represent disorders of the myoneural junction and muscle, including autoimmune myasthenia gravis and other congenital or acquired myoneural transmission disorders. These conditions primarily affect neuromuscular transmission and skeletal muscle strength. Accurate coding matters for appropriate reimbursement and for reflecting clinical complexity in claims and medical records.

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    When to Use

    Use a code from this group when clinical documentation supports a diagnosis of myasthenia gravis, congenital myasthenic syndrome, or another specified myoneural junction disorder. Codes are selected based on documented disease type, acute complications, and involvement of bulbar or respiratory muscles.

    ICD-10-CM Codes

    8 rows

    ICD-10-CM CodeDescription
    G70.00Myasthenia gravis without (acute) exacerbation
    G70.01Myasthenia gravis with (acute) exacerbation
    G70.1Toxic myoneural disorders
    G70.2Congenital and developmental myasthenia
    G70.80Lambert-Eaton syndrome, unspecified
    G70.81Lambert-Eaton syndrome in disease classified elsewhere
    G70.89Other specified myoneural disorders
    G70.9Myoneural disorder, unspecified

    DRG Codes

    4 rows

    DRG CodeDescription
    056Degenerative Nervous System Disorders with MCC
    057Degenerative Nervous System Disorders without MCC
    073Cranial and Peripheral Nerve Disorders with MCC
    074Cranial and Peripheral Nerve Disorders without MCC

    Typical Clinical Scenarios

    • A middle-aged woman presents to the emergency department with progressive binocular diplopia, ptosis that fluctuates through the day, and generalized fatigue after minimal exertion. Neurologic exam shows fatigable weakness of eyelid elevation and extraocular movements, and bedside edrophonium (or portable bedside repetitive nerve stimulation) is suggestive of neuromuscular transmission defect; diagnosis from this group is assigned for autoimmune myasthenic disease. Typical codes: G70.00, G70.01
    • An older adult with long-standing diagnosed myasthenia gravis is admitted for increasing respiratory difficulty and inability to clear secretions after a chest infection; arterial blood gas shows hypercapnia and the patient requires ventilatory support. This acute decompensation of neuromuscular respiratory function is coded as a myasthenic crisis to reflect the emergent life‑threatening exacerbation of the underlying disorder. Typical codes: G70.01, G70.9
    • A patient with chronic proximal muscle weakness, elevated creatine kinase, and electromyography changes suggestive of a primary myopathy is evaluated as an outpatient for persistent myoneural symptoms not due to autoimmune neuromuscular junction disease; muscular dystrophy or other specified myoneural disorder is considered and coded to capture a chronic myoneural disorder. Typical codes: G70.2, G70.89

    Related Codes

    G71-PRIMARY-DISORDERS-OF-MUSCLES

    ICD-10-CM Code For Primary Disorders Of Muscles: Group Overview

    G72-OTHER-AND-UNSPECIFIED-MYOPATHIES

    ICD-10-CM Code For Other And Unspecified Myopathies: Group Overview

    G73-DISORDERS-OF-MYONEURAL-JUNCTION-AND-MUSCLE

    ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle 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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