G31.9

G31.9: Degenerative disease of nervous system, unspecified

Billable / specific codeICD-10-CM

G31.9 is a billable, specific ICD-10-CM code for degenerative disease of nervous system, unspecified. It is valid for submission on a claim.

Check G31.9 with the rest of the claim: free scrubber

Excludes2 inherited from the categories above G31.9

Not part of this code, but both may be coded when both are present.

Written on G31: Other degenerative diseases of nervous system, not elsewhere classified

Reye's syndrome (G93.7)

Other codes that can never be billed with G31.9

Their own Excludes1 notes name this code, so the conflict is not listed above.

F06.7Mild neurocognitive disorder due to known physiological condition
G31.84Mild cognitive impairment of uncertain or unknown etiology

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G31.9 is named in 6 Medicare coverage policies: 6 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A53134Billing and Coding: NCD Coding Article for Positron Emission Tomography (PET) Scans Used for Non-Oncologic Conditions
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56619Billing and Coding: Nerve Conduction Studies and Electromyography
A56937Billing and Coding: Psychiatry and Psychology Services

Alphabetic index entries that lead here

Atrophy, atrophic›brain(cortex) (progressive)
Degeneration, degenerative›brain(cortical) (progressive)
Degeneration, degenerative›cerebellar NOS
Degeneration, degenerative›nervous system
Hemiatrophy›cerebellar
Degeneration, degenerative›brain›childhood

Code history

Unchanged in every release from FY2024 to FY2027.