ICD-10-CM Code H55.00

Unspecified nystagmus

Version 2021 Billable Code

Valid for Submission

H55.00 is a billable code used to specify a medical diagnosis of unspecified nystagmus. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code H55.00 might also be used to specify conditions or terms like acquired nystagmus, essential tremor, eyelid nystagmus, hereditary essential tremor, idiopathic nystagmus, irregular nystagmus, etc

Short Description:Unspecified nystagmus
Long Description:Unspecified nystagmus

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 H55.00 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:

  • Acquired nystagmus
  • Essential tremor
  • Eyelid nystagmus
  • Hereditary essential tremor
  • Idiopathic nystagmus
  • Irregular nystagmus
  • Manifest nystagmus
  • Nystagmus
  • Nystagmus and other irregular eye movements
  • Nystagmus inhibited when fixation removed
  • Nystagmus present
  • Nystagmus signs
  • Nystagmus unchanged when fixation removed
  • O/E - nystagmus
  • O/E - nystagmus - CNS -regular
  • Permanent nystagmus
  • Physiological nystagmus
  • Rotational nystagmus
  • Symptomatic nystagmus
  • Tremor, nystagmus, duodenal ulcer syndrome

Clinical Information

  • NYSTAGMUS PATHOLOGIC-. involuntary movements of the eye that are divided into two types jerk and pendular. jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction and is usually caused by central or peripheral vestibular dysfunction. pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. adams et al. principles of neurology 6th ed p272
  • NYSTAGMUS PHYSIOLOGIC-. involuntary rhythmical movements of the eyes in the normal person. these can be naturally occurring as in end position end point end stage or deviational nystagmus or induced by the optokinetic drum nystagmus optokinetic caloric test or a rotating chair.
  • NYSTAGMUS OPTOKINETIC-. normal nystagmus produced by looking at objects moving across the field of vision.
  • NYSTAGMUS CONGENITAL-. nystagmus present at birth or caused by lesions sustained in utero or at the time of birth. it is usually pendular and is associated with albinism and conditions characterized by early loss of central vision. inheritance patterns may be x linked autosomal dominant or recessive. adams et al. principles of neurology 6th ed p275

Convert H55.00 to ICD-9

Code Classification

  • Diseases of the eye and adnexa (H00–H59)
    • Other disorders of eye and adnexa (H55-H57)
      • Nystagmus and other irregular eye movements (H55)

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

Eye Movement Disorders

When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly.

There are many kinds of eye movement disorders. Two common ones are

  • Strabismus - a disorder in which the two eyes don't line up in the same direction. This results in "crossed eyes" or "walleye."
  • Nystagmus - fast, uncontrollable movements of the eyes, sometimes called "dancing eyes"

Some eye movement disorders are present at birth. Others develop over time and may be associated with other problems, such as injuries. Treatments include glasses, patches, eye muscle exercises, and surgery. There is no cure for some kinds of eye movement disorders, such as most kinds of nystagmus.

  • Cranial mononeuropathy III (Medical Encyclopedia)
  • Cranial mononeuropathy VI (Medical Encyclopedia)
  • Eye muscle repair (Medical Encyclopedia)
  • Nystagmus (Medical Encyclopedia)
  • Strabismus (Medical Encyclopedia)
  • Supranuclear ophthalmoplegia (Medical Encyclopedia)

[Learn More]