2027 ICD-10-CM Diagnosis Code G98Other disorders of nervous system not elsewhere classified

ICD-10-CM Codes›G00–G99›G89-G99›G98

ICD-10-CM G98
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G98 is a non-billable ICD-10-CM category code for other disorders of nervous system not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G98.0 and G98.8.

Code Identity

ICD-10-CM Code
G98
Billable Status
No — Non-Billable Category
Code Describes
Other disorders of nervous system not elsewhere classified
Short Description
Other disorders of nervous system not elsewhere classified
Same as the full description in the CMS dataset.
Chapter
G89-G99
Other disorders of the nervous system

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG98Other disorders of nervous system not elsewhere classified
This CodeG98Other disorders of nervous system not elsewhere classified

Specific Coding for Other disorders of nervous system not elsewhere classifiedOverview

Non-specific codes like G98 require more characters. Use one of these billable codes instead:

  • Use G98.0 for Neurogenic arthritis, not elsewhere classified

  • Use G98.8 for Other disorders of nervous system

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G98: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • nervous system disorder NOS

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Neurologic Diseases

The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G98Overview

What is the ICD-10 code for other disorders of nervous system not elsewhere classified?

G98 is the ICD-10-CM category for other disorders of nervous system not elsewhere classified, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is G98 (Other disorders of nervous system not elsewhere classified) a billable code?

No. This is a category header that groups the codes for other disorders of nervous system not elsewhere classified, and headers cannot be submitted on claims. Claims for other disorders of nervous system not elsewhere classified need a more specific code from this category, such as G98.0 and G98.8.