Systemic atrophies primarily affecting the central nervous system (G10-G14)
G12: Spinal muscular atrophy and related syndromes
G12.0: Infantile spinal muscular atrophy, type I [Werdnig-Hoffman]
G12.1: Other inherited spinal muscular atrophy
G12.2: Motor neuron disease
G12.8: Other spinal muscular atrophies and related syndromes
G12.9: Spinal muscular atrophy, unspecified
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