ICD-10 Code G12.2 – Motor neuron disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G12.2 – Motor neuron disease
What it is
G12.2 identifies motor neuron disease, a group of disorders that damage the nerve cells controlling voluntary muscle movement. It is used when documentation names motor neuron disease without a more specific subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings include progressive weakness, muscle wasting, and signs of upper or lower motor neuron involvement, such as spasticity or fasciculations.
When to use this code
Use G12.2 when the provider documents motor neuron disease and does not specify amyotrophic lateral sclerosis or another more exact diagnosis. It may also fit follow-up visits for a documented motor neuron disease diagnosis when the subtype remains unspecified.
If the record only mentions weakness, paralysis, or suspected neurologic disease, do not assume this code. Check documentation for a confirmed diagnosis before assigning G12.2.
Do not use for
Do not use this code for ALS when a more specific code is documented. Also avoid it for nonspecific weakness, neuropathy, or muscle disease without documented motor neuron disease.
Coding tip
Code the most specific motor neuron disease documented, and query the provider if the record is unclear.