2024 ICD-10-CM Diagnosis Code G98.8

Other disorders of nervous system

ICD-10-CM Code:
ICD-10 Code for:
Other disorders of nervous system
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Diseases of the nervous system
    • Other disorders of the nervous system
      • Other disorders of nervous system not elsewhere classified

G98.8 is a billable diagnosis code used to specify a medical diagnosis of other disorders of nervous system. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

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
  • Adenoviral nervous system infection
  • Allan-Herndon-Dudley syndrome
  • Bacterial infection of the nervous system
  • Bacterial neuritis
  • Balint syndrome
  • Chronic musculoskeletal pain due to disease of nervous system
  • Chronic nervous system disorder
  • Delayed myelination
  • Disease of nervous system complicating pregnancy, childbirth and puerperium
  • Disorder confirmed
  • Disorder of nervous system
  • Disorder of olfactory system
  • Enteroviral neurological disease
  • Fungal neuritis
  • Fungal neuritis
  • 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
  • Hypohidrosis
  • Hypohidrosis due to neurological disorder
  • Infection of peripheral nerve caused by fungus
  • Infection of peripheral nerve caused by fungus
  • Infection of peripheral nerve caused by Mucorales
  • Infectious disease of nervous system
  • Inherited metabolic disorder of nervous system
  • Lathyrus species poisoning
  • Lathyrus sylvestris poisoning
  • Localized hyperhidrosis due to focal neurological disorder
  • Lower motor neuron lesion
  • Nervous system and sense organ diseases
  • Neurological complication of procedure
  • Neurological disorder caused by ethanol
  • Neurological disorder confirmed
  • Neurological disorder due to and following lumbar puncture
  • 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
  • Perinatal neurological disorder
  • Pruritus due to neurological disorder
  • Space-occupying lesion of nervous system
  • System disorder of the nervous system
  • X-linked hereditary spastic paraplegia

Clinical Classification

Clinical Information

  • Hypohidrosis

    abnormally diminished or absent perspiration. both generalized and segmented (reduced or absent sweating in circumscribed locations) forms of the disease are usually associated with other underlying conditions.
  • Grade 2 Hypohidrosis, CTCAE|Grade 2 Hypohidrosis

    symptomatic; limiting instrumental adl
  • Grade 3 Hypohidrosis, CTCAE|Grade 3 Hypohidrosis

    increase in body temperature; limiting self care adl
  • Grade 4 Hypohidrosis, CTCAE|Grade 4 Hypohidrosis

    heat stroke
  • Grade 5 Hypohidrosis, CTCAE|Grade 5 Hypohidrosis

  • Hypohidrosis

    reduced sweating. causes include burns, dehydration, radiation, and leprosy.
  • Hypohidrosis, CTCAE|Hypohidrosis|Hypohidrosis

    a disorder characterized by reduced sweating.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

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 References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert G98.8 to ICD-9-CM

  • ICD-9-CM Code: 349.89 - Cns disorder NEC
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.
  • ICD-9-CM Code: 349.9 - Cns disorder NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education

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.

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

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.