G12.9 Spinal muscular atrophy, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Risk adjustment (HCC)

• CMS-HCC V28: HCC 190 — Amyotrophic Lateral Sclerosis and Other Motor Neuron Disease, Spinal Muscular Atrophy
• CMS-HCC V22: HCC 72 — Spinal Cord Disorders/Injuries
• RxHCC V08: HCC 155 — Spinal Cord Disorders
• ESRD V24: HCC 72

MS-DRG index

Defines the logic of DRG(s) 056-057 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 335.10 Spinal muscular atrophy, unspecified (approximate)
• 335.9 Anterior horn cell disease, unspecified (approximate)

Diagnosis Index entries for G12.9

• Atrophy, atrophic (of) › muscle, muscular (diffuse) (general) (idiopathic) (primary) › spinal

Nearby codes

• G12.23 Primary lateral sclerosis
• G12.24 Familial motor neuron disease
• G12.25 Progressive spinal muscle atrophy
• G12.29 Other motor neuron disease
• G12.8 Other spinal muscular atrophies and related syndromes
• G12.9 Spinal muscular atrophy, unspecified (this code)