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    v1.0.28
    OpenPayerBilling CodesSystemic atrophies primarily affecting the central nervous systemICD-10-CM g12-spinal-muscular-atrophy-and-related-syndromes
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    ICD-10-CM Code For Spinal Muscular Atrophy And Related Syndromes: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G12 includes spinal muscular atrophy and related motor neuron disorders such as classic spinal muscular atrophy, hereditary motor neuron diseases, and other progressive anterior horn cell degenerations that cause muscle weakness and atrophy. These ICD-10-CM diagnosis codes are used to document clinical presentations ranging from infantile-onset hypotonia to adult-onset progressive motor neuron dysfunction, capturing disease severity, respiratory involvement, and need for supportive interventions. Accurate coding within the ICD-10-CM G12 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G12: Spinal Muscular Atrophy And Related Syndromes Overview

    This group encompasses spinal muscular atrophy and related hereditary and degenerative motor neuron disorders that primarily affect the anterior horn cells of the spinal cord and motor neurons of the brainstem. These conditions target the neuromuscular system leading to progressive muscle weakness and atrophy. Accurate coding matters for proper claim adjudication and to reflect disease severity and supportive care needs for reimbursement.

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    When to Use

    Use a code from this group when clinical documentation indicates a diagnosis of spinal muscular atrophy or a related motor neuron disorder documented by a qualified clinician. Codes in this group are appropriate when documentation specifies the type, onset, or complications such as respiratory failure, ventilator dependence, or feeding difficulties associated with the disorder.

    ICD-10-CM Codes

    11 rows

    ICD-10-CM CodeDescription
    G12.0Infantile spinal muscular atrophy, type I [Werdnig-Hoffman]
    G12.1Other inherited spinal muscular atrophy
    G12.20Motor neuron disease, unspecified
    G12.21Amyotrophic lateral sclerosis
    G12.22Progressive bulbar palsy
    G12.23Primary lateral sclerosis
    G12.24Familial motor neuron disease
    G12.25Progressive spinal muscle atrophy
    G12.29Other motor neuron disease
    G12.8Other spinal muscular atrophies and related syndromes
    G12.9Spinal muscular atrophy, unspecified

    DRG Codes

    2 rows

    DRG CodeDescription
    056Degenerative Nervous System Disorders with MCC
    057Degenerative Nervous System Disorders without MCC

    Typical Clinical Scenarios

    • An infant from a family with a known SMN1 gene mutation presents for evaluation of hypotonia, poor feeding, weak cry, and delayed motor milestones noticed at 2 months of age; genetic testing confirms homozygous SMN1 deletion consistent with spinal muscular atrophy type 1 (Werdnig‑Hoffmann disease). The visit documents progressive symmetrical proximal muscle weakness and respiratory insufficiency risk, so a code denoting infantile-onset SMA is assigned for ongoing neuromuscular management and surveillance. Typical codes: G12.0, G12.21.
    • An adult in their 30s with slowly progressive limb weakness, muscle cramps, and gait difficulty over several years presents to neurology for worsening functional decline; electromyography shows chronic denervation and genetic testing identifies a later-onset SMN-related phenotype. Because this is a chronic, slowly progressive motor neuron disorder primarily affecting the spinal anterior horn cells, a code for chronic spinal muscular atrophy is used to capture long-term management needs and disability assessment. Typical codes: G12.2, G12.22.
    • A teenager with known spinal muscular atrophy develops acute respiratory distress secondary to aspiration pneumonia and requires hospitalization; the admission notes respiratory failure complicating underlying neuromuscular disease with need for ventilatory support. In the inpatient setting the coding must reflect the underlying systemic atrophy affecting the central nervous system as the comorbid condition contributing to respiratory compromise. Typical codes: G12.21, G12.29.

    Related Codes

    G10-HUNTINGTON-S-DISEASE

    ICD-10-CM Code For Huntington's Disease: Group Overview

    G11-HEREDITARY-ATAXIA

    ICD-10-CM Code For Hereditary Ataxia: Group Overview

    G13-SYSTEMIC-ATROPHIES-CENTRAL-NERVOUS-SYSTEM

    ICD-10-CM Code For Systemic Atrophies Primarily Affecting Central Nervous System: Group Overview

    G14-POSTPOLIO-SYNDROME

    ICD-10-CM Code For Postpolio Syndrome: 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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