ICD-10 Code G12.1 – Other inherited spinal muscular atrophy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G12.1 – Other inherited spinal muscular atrophy
What it is
G12.1 identifies inherited spinal muscular atrophy not described by a more specific code. It covers genetic motor neuron disorders that cause progressive muscle weakness and wasting.
Clinical signs
Typical findings include symmetric proximal weakness, muscle atrophy, reduced reflexes, and motor delay or loss of motor milestones. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record documents an inherited spinal muscular atrophy and no more specific subtype is named. You may also use it when the clinician states “other” or provides a genetic motor neuron disorder without further detail. Check documentation if the diagnosis is uncertain or if another neuromuscular condition is better supported.
Do not use for
Do not use this code for acquired spinal muscle disorders, nonspecific weakness, or unrelated myopathies. If the chart names a specific spinal muscular atrophy type, code that diagnosis instead.
Coding tip
Code the most specific SMA diagnosis available and verify whether the provider documented an inherited subtype.