ICD-10-CM Code G98.8

Other disorders of nervous system

Version 2021 Billable Code

Valid for Submission

G98.8 is a billable code used to specify a medical diagnosis of other disorders of nervous system. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code G98.8 might also be used to specify conditions or terms like abscess of nervous system, acute nervous system disorder, allan-herndon-dudley syndrome, bacterial infection of the nervous system, balint syndrome, chronic musculoskeletal pain due to disease of nervous system, etc

Short Description:Other disorders of nervous system
Long Description:Other disorders of nervous system

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code G98.8:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Nervous system disorder NOS

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code G98.8 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Abscess of nervous system
  • Acute nervous system disorder
  • Allan-Herndon-Dudley syndrome
  • Bacterial infection of the nervous system
  • Balint syndrome
  • Chronic musculoskeletal pain due to disease of nervous system
  • Chronic nervous system disorder
  • Complication of procedure by succeeding disorder
  • Delayed myelination
  • Disease of nervous system complicating pregnancy, childbirth and puerperium
  • Disorder confirmed
  • Disorder of nervous system
  • Disorder of olfactory system
  • Hemorrhage into nerve trunk
  • Hereditary disorder of nervous system
  • Heterotopic ossification due to neurological disorder
  • Human immunodeficiency virus infection with neurological disease
  • Hypermelanosis due to nervous system disorder
  • Infectious disease of nervous system
  • Inherited metabolic disorder of nervous system
  • Intensive care neurological disorder
  • Lathyrus species poisoning
  • Lathyrus sylvestris poisoning
  • Lower motor neurone lesion
  • Nervous system and sense organ diseases
  • Neurological complication of procedure
  • Neurological disorder caused by ingestible alcohol
  • Neurological disorder confirmed
  • Neurological disorder due to excess intake of macronutrients
  • Neurological disorder due to excess intake of micronutrients
  • Neurological disorder due to nutrient deficiency
  • Neurological disorder treatment changed
  • Neurological disorder treatment started
  • Neurological lesion
  • Neuronal intranuclear inclusion disease
  • Oculomotor apraxia
  • On examination - neurodevelopmental disorder
  • Perinatal neurological disorder
  • Pruritus due to neurological disorder
  • Pruritus due to systemic disorder
  • Space-occupying lesion of nervous system
  • System disorder of the nervous system
  • Toxic effect of food contaminant
  • Upper motor neurone lesion

Convert G98.8 to ICD-9

  • 349.89 - Cns disorder NEC (Approximate Flag)
  • 349.9 - Cns disorder NOS (Approximate Flag)

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Other disorders of the nervous system (G89-G99)
      • Other disorders of nervous system not elsewhere classified (G98)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients

Neurologic Diseases

Also called: Nervous system 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.

There are more than 600 neurologic diseases. Major types include

  • Diseases caused by faulty genes, such as Huntington's disease and muscular dystrophy
  • Problems with the way the nervous system develops, such as spina bifida
  • Degenerative diseases, where nerve cells are damaged or die, such as Parkinson's disease and Alzheimer's disease
  • Diseases of the blood vessels that supply the brain, such as stroke
  • Injuries to the spinal cord and brain
  • Seizure disorders, such as epilepsy
  • Cancer, such as brain tumors
  • infections, such as meningitis
  • Cerebral spinal fluid (CSF) collection (Medical Encyclopedia)
  • EEG (Medical Encyclopedia)

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