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  6. 2025 ICD-10-CM Code R29.818

2025 ICD-10-CM Diagnosis Code R29.818

Other symptoms and signs involving the nervous system

ICD-10-CM Code:
R29.818
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:

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, 2024 through September 30, 2025.

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.

Code Classification

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    R00–R99
    • Symptoms and signs involving the nervous and musculoskeletal systems
      R25-R29
      • Other symptoms and signs involving the nervous and musculoskeletal systems
        R29

Approximate Synonyms

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

  • 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 Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

Nervous system signs and symptoms

CCSR Code: SYM010

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

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

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

Nerve/musculskel sym NEC

ICD-9-CM: 781.99

Approximate Flag - The approximate mapping means this ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option, but it may not fully capture the original diagnosis or clinical intent.

View Conversion

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.

Footnotes

[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.