G23.8

G23.8: Other specified degenerative diseases of basal ganglia

Billable / specific codeICD-10-CM

G23.8 is a billable, specific ICD-10-CM code for other specified degenerative diseases of basal ganglia. It is valid for submission on a claim.

Check G23.8 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Calcification of basal ganglia

Excludes2 inherited from the categories above G23.8

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

Written on G23: Other degenerative diseases of basal ganglia

multi-system degeneration of the autonomic nervous system (G90.3)

Risk adjustment

G23.8 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 199 Parkinson and Other Degenerative Disease of Basal Ganglia0.615 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.

Medicare coverage

G23.8 is named in 9 Medicare coverage policies: 9 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A54954Billing and Coding: Autonomic Function Tests
A56612Billing and Coding: CT of the Head
A56619Billing and Coding: Nerve Conduction Studies and Electromyography

Alphabetic index entries that lead here

Déjérine-Thomas atrophy
Fahr disease(of brain)
Atrophy, atrophic›Déjérine-Thomas
Atrophy, atrophic›olivopontocerebellar
Calcification›basal ganglia
Degeneration, degenerative›olivopontocerebellar(hereditary) (familial)
Disease, diseased›Fahr(of brain)
Degeneration, degenerative›basal nuclei or ganglia›specified NEC
Disease, diseased›basal ganglia›degenerative›specified NEC

Code history

Unchanged in every release from FY2024 to FY2027.