What is ICD-10 code G32.89?

G32.89 is the ICD-10-CM diagnosis code for Other specified degenerative disorders of nervous system in diseases classified elsewhere. It belongs to the ICD-10-CM chapter for diseases of the nervous system (g00-g99). G32.89 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. G32.89 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. G32.89 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. G32.89 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does G32.89 map to under V28?

G32.89 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for G32.89?

G32.89 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for G32.89?

G32.89 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

2026 ICD-10-CM G32.89: Other specified degenerative

G32.89 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupG32.89

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Other degenerative diseases of the nervous system (G30-G32)

G32.89

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Other specified degenerative disorders of nervous system in diseases classified elsewhere

This code describes degenerative nerve and nervous system damage that occurs as a complication of another disease listed elsewhere in the medical record. It is used when the nerve damage is secondary to or caused by a different primary condition.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

G32Other degenerative disorders of nervous system in diseases classified elsewhere G32.8Other specified degenerative disorders of nervous system in diseases classified elsewhere G32.89Other specified degenerative disorders of nervous system in diseases classified elsewhere

Inclusion Terms

Official

Degenerative encephalopathy in diseases classified elsewhere

Excludes 2

Official

certain conditions originating in the perinatal period (P04-P96)Inherited from G00-G99
certain infectious and parasitic diseases (A00-B99)Inherited from G00-G99
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from G00-G99
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from G00-G99
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from G00-G99
injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from G00-G99
neoplasms (C00-D49)Inherited from G00-G99
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from G00-G99

Related Codes

Official

G32.81Cerebellar ataxia in diseases classified elsewhere

Includes

Official

No Includes notes are included in this display for G32.89. Check the code and parent instructions in the Code Book.

Excludes 1

Official

superior hemorrhagic polioencephalitis [Wernicke's encephalopathy] (E51.2)Inherited from G32.8

Code First

Official

underlying disease, such as:Inherited from G32.8
amyloidosis cerebral degeneration (E85.-)Inherited from G32.8
cerebral degeneration (due to) hypothyroidism (E00.0-E03.9)Inherited from G32.8
cerebral degeneration (due to) neoplasm (C00-D49)Inherited from G32.8
cerebral degeneration (due to) vitamin B deficiency, except thiamine (E52-E53.-)Inherited from G32.8

Use Additional

Official

No Use Additional Code instructions are included in this display for G32.89. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for G32.89. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Always code the underlying disease first (the primary condition causing the nervous system degeneration), then use G32.89 as a secondary diagnosis to show the neurological complication

Review the medical record carefully to identify what disease is causing the degenerative nervous system disorder, as this code requires documentation of the causal relationship between two conditions

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is G32.89 an HCC code?

No. G32.89 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.

Code: G32.89
Description: Other specified degenerative disorders of nervous system in diseases classified elsewhere
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

Get the V28 mapping + MEAT cheat sheet

One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.

Free PDF. No card. Unsubscribe anytime.

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

G32.89 is the ICD-10-CM diagnosis code for other specified degenerative disorders of nervous system in diseases classified elsewhere. This code describes degenerative nerve and nervous system damage that occurs as a complication of another disease listed elsewhere in the medical record. It is used when the nerve damage is secondary to or caused by a different primary condition. G32.89 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering other degenerative diseases of the nervous system (g30-g32).

G32.89 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

Always code the underlying disease first (the primary condition causing the nervous system degeneration), then use G32.89 as a secondary diagnosis to show the neurological complication.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G32.89 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Always code the underlying disease first (the primary condition causing the nervous system degeneration), then use G32.89 as a secondary diagnosis to show the neurological complication
•Review the medical record carefully to identify what disease is causing the degenerative nervous system disorder, as this code requires documentation of the causal relationship between two conditions