G23 — Other degenerative diseases of basal ganglia
Is G23 billable?
No — G23 is a non-billable header code. G23 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 6 billable codes beneath G23.
Billable codes under this header
- G23.0Hallervorden-Spatz disease
- G23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
- G23.2Striatonigral degeneration
- G23.3Hypomyelination with atrophy of the basal ganglia and cerebellum
- G23.8Other specified degenerative diseases of basal ganglia
- G23.9Degenerative disease of basal ganglia, unspecified
G23 at a glance
| Code | G23 |
|---|---|
| Description | Other degenerative diseases of basal ganglia |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of G23, but a patient may have both at the same time. When documentation supports it, G23 and the excluded code may both be reported.
- multi-system degeneration of the autonomic nervous system (G90.3)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G23, but a patient may have both at the same time. When documentation supports it, G23 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
What codes fall under G23? (6)
- G23.0Hallervorden-Spatz disease
- G23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
- G23.2Striatonigral degeneration
- G23.3Hypomyelination with atrophy of the basal ganglia and cerebellum
- G23.8Other specified degenerative diseases of basal ganglia
- G23.9Degenerative disease of basal ganglia, unspecified
How long has G23 existed?
G23 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.