ICD-10 Code G12 – Spinal muscular atrophy and related syndromes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G12 – Spinal muscular atrophy and related syndromes
What it is
G12 identifies spinal muscular atrophy and related lower motor neuron syndromes. These conditions cause progressive weakness because nerve cells in the spinal cord degenerate, reducing muscle control.
Clinical signs
Clinical features vary; refer to documentation. Common findings include muscle weakness, hypotonia, reduced reflexes, and progressive motor delay or loss of motor function.
When to use this code
Use G12 when the record documents spinal muscular atrophy or another related motor neuron syndrome without a more specific subtype. It also fits cases where the provider confirms a lower motor neuron disorder within this category. If the note names a specific hereditary form, code to the documented diagnosis. Check documentation when the type is unclear.
Do not use for
Do not use G12 for generalized muscle weakness, myopathy, or other neuromuscular disorders unless the provider specifically documents spinal muscular atrophy. Avoid it when a more specific ICD-10-CM code is available.
Coding tip
Code the most specific documented subtype first, and use G12 only when the chart supports this broader category.