Version 2024
No Valid Principal Dx

2024 ICD-10-CM Diagnosis Code R29.818

Other symptoms and signs involving the nervous system

ICD-10-CM Code:
ICD-10 Code for:
Other symptoms and signs involving the nervous system
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    • Symptoms and signs involving the nervous and musculoskeletal systems
      • Other symptoms and signs involving the nervous and musculoskeletal systems

R29.818 is a billable diagnosis code used to specify a medical diagnosis of other symptoms and signs involving the 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.

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.

Approximate Synonyms

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

  • Abnormal findings on diagnostic imaging of skull and head
  • Abnormal neurovascular status of distal limb
  • Abnormality of myotome
  • Absence of receptor sites
  • Alopecia, progressive neurological defect, endocrinopathy syndrome
  • Alteration in tissue perfusion
  • Arthropathy of the elbow associated with a neurological disorder
  • Autosomal recessive cerebellar ataxia, pyramidal signs, nystagmus, oculomotor apraxia syndrome
  • Barany's sign
  • Barber's chair sign
  • Barber's chair sign positive
  • Bilateral deficit of nervous system structures
  • Brudzinski's sign positive
  • Bulging fontanelle
  • Cerebrospinal fluid flow finding
  • Chvostek sign positive
  • Congenital nystagmus
  • Congenital nystagmus with sensory abnormality
  • Cord sign
  • Crossed laterality
  • Decrease in receptor sites
  • Decreased intracranial pressure adaptive capacity
  • Decreased pain threshold
  • Difficulty accepting base of support
  • Difficulty performing oral motor functions
  • Does not accept base of support
  • Does not move blade of tongue
  • Does not perform oral motor functions
  • Effects of lightning
  • Empty delta sign
  • Extrapyramidal sign
  • Filling defect
  • Finding of intracranial pressure
  • Finding related to ability to accept base of support
  • Finding related to ability to accept base of support
  • Finding related to ability to accept base of support
  • Finding related to ability to move blade of tongue
  • Finding related to neurovascular status of limb
  • Flail arm
  • Flail motion
  • Fluctuation of cerebral spinal fluid
  • Froment's sign positive
  • Hippocampal pressure groove
  • Impaired peripheral neurovascular function
  • Increase in receptor sites
  • Ineffective tissue perfusion
  • Inequality in size of cerebral ventricles
  • Kernig's sign positive
  • Level of fontanelle - finding
  • Low pain threshold
  • Midline shift of brain
  • Named sensory sign
  • Neck pain co-occurrent with neurological deficit following whiplash injury to neck
  • Nervous system problem
  • Neurodisability
  • Neurological deficit
  • Neurological deficit
  • Neurological deficit
  • Neurological disorder due to obesity
  • Neurological disorder monitoring status
  • Neurological drug side effects
  • Neurological injury from lightning
  • Neuronal depopulation
  • Neurovascular deficit
  • No reactive accommodation reflex
  • Orthostatic intolerance
  • Pain threshold - finding
  • Past pointing present
  • Piebald trait with neurologic defects syndrome
  • Pronator drift
  • Pseudoparalysis
  • Pseudoparalysis
  • Pseudoparalysis due to generalized arthritis
  • Pyramidal sign
  • Receptor site alteration
  • Reduced flow of cerebrospinal fluid
  • Romberg's sign positive
  • Spinal atrophy, ophthalmoplegia, pyramidal syndrome
  • Surface receptor redistribution
  • Tinel's sign positive
  • Transient monoplegia
  • Unable to accept base of support
  • X-linked intellectual disability with hypogammaglobulinemia and progressive neurological deterioration syndrome

Clinical Classification

Clinical Information

  • Orthostatic Intolerance

    symptoms of cerebral hypoperfusion or autonomic overaction which develop while the subject is standing, but are relieved on recumbency. types of this include neurocardiogenic syncope; postural orthostatic tachycardia syndrome; and neurogenic orthostatic hypotension. (from noseworthy, jh., neurological therapeutics principles and practice, 2007, p2575-2576)

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 R29.818 to ICD-9-CM

  • ICD-9-CM Code: 781.99 - Nerve/musculskel sym 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.

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.