Other anterior horn cell diseases

This code signifies a group of neurological disorders primarily affecting the motor neurons in the anterior horn of the spinal cord, leading to muscle weakness, atrophy, and fasciculations. These conditions are distinct from poliomyelitis and amyotrophic lateral sclerosis (ALS), representing other less common or specified forms of anterior horn cell degeneration.

Use this code for diagnoses of anterior horn cell diseases that do not fit into more specific categories like poliomyelitis or ALS, but still involve the primary degeneration of motor neurons. Documentation should clearly indicate a diagnosis of an anterior horn cell disease and rule out other more specific conditions.

• Ensure documentation specifies "other" or "unspecified" anterior horn cell disease if a more precise diagnosis isn't available.
• Differentiate carefully from G12.21 (ALS) and G12.0 (Infantile spinal muscular atrophy, type I [Werdnig-Hoffmann]).
• Always review the medical record for any further specificity that might lead to a more precise ICD-9-CM code within the G12 category.