ICD-10-CM Code R29.90

Unspecified symptoms and signs involving the nervous system

Version 2020 Billable Code No Valid Principal Dx

Valid for Submission

R29.90 is a billable code used to specify a medical diagnosis of unspecified symptoms and signs involving the nervous system. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code R29.90 might also be used to specify conditions or terms like bite of unidentified snake with neurological signs, central nervous system deficit, generalized hyperhidrosis, generalized hyperhidrosis due to neurological disorder, hypernasality syndrome, hypernasality syndrome due to neurologic disease, etc

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.

Short Description:Unspecified symptoms and signs involving the nervous system
Long Description:Unspecified symptoms and signs involving the nervous system

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 R29.90 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:

  • Bite of unidentified snake with neurological signs
  • Central nervous system deficit
  • Generalized hyperhidrosis
  • Generalized hyperhidrosis due to neurological disorder
  • Hypernasality syndrome
  • Hypernasality syndrome due to neurologic disease
  • Miscellaneous CNS sign AND/OR symptom
  • Nasal resonatory disorder
  • Nervous system symptoms
  • Neurological disorder monitoring status
  • Neurological symptom
  • Neurological symptom changes
  • O/E - CNS deficit
  • O/E - sign - in nerve
  • Poisoning due to bite of unidentified snake
  • Transient neurological symptoms

Convert R29.90 to ICD-9

  • 781.99 - Nerve/musculskel sym NEC (Approximate Flag)

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)
      • Oth symptoms and signs involving the nervous and ms systems (R29)

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

Information for Patients

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]