2024 ICD-10-CM Diagnosis Code H55.00

Unspecified nystagmus

ICD-10-CM Code:
H55.00
ICD-10 Code for:
Unspecified nystagmus
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

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)

H55.00 is a billable diagnosis code used to specify a medical diagnosis of unspecified nystagmus. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like H55.00 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

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
  • Permanent nystagmus
  • Physiological nystagmus
  • Rotational nystagmus
  • Symptomatic nystagmus
  • Tremor, nystagmus, duodenal ulcer syndrome
  • Uniocular nystagmus
  • Uniocular nystagmus
  • Uniocular nystagmus of left eye
  • Uniocular nystagmus of right eye

Clinical Classification

Clinical Information

  • Essential Tremor

    a relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. the tremor is usually mild, but when severe may be disabling. an autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (mov disord 1988;13(1):5-10)
  • Grade 2 Nystagmus, CTCAE|Grade 2 Nystagmus|Grade 2 Nystagmus

    moderate symptoms; limiting instrumental adl
  • Grade 3 Nystagmus, CTCAE|Grade 3 Nystagmus|Grade 3 Nystagmus

    severe symptoms; limiting self care adl
  • Kurtzke Functional System Scores KFSS103 Original Result - Moderate nystagmus or other mild disability|KFSS103-Moderate nystagmus or other mild disability|Moderate nystagmus or other mild disability

    kurtzke functional system scores kfss103 original result - moderate nystagmus or other mild disability.
  • Kurtzke Functional System Scores KFSS103 Original Result - Severe nystagmus, marked extraocular weakness, or moderate disability of other cranial nerves|KFSS103-Severe nystagmus, marked extraocular weakness, or moderate disability of other cranial nerves|Severe nystagmus, marked extraocular weakness, or moderate disability of other cranial nerves

    kurtzke functional system scores kfss103 original result - severe nystagmus, marked extraocular weakness, or moderate disability of other cranial nerves.
  • Nystagmus

    involuntary movements of the eyeballs. the presence or absence of nystagmus is often used in the diagnosis of a variety of neurological and visual disorders.
  • Nystagmus, CTCAE 5.0|Nystagmus|Nystagmus

    a disorder characterized by involuntary movements of the eyeballs.
  • Essential Tremor

    a movement disorder characterized by involuntary and rhythmic shaking of parts of the body, most often the hands or arms, that can be triggered or worsened by physical or environmental stressors. essential tremor may be progressive and can be inherited in an autosomal dominant manner.

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 H55.00 to ICD-9-CM

  • ICD-9-CM Code: 379.50 - Nystagmus NOS

Patient Education


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.


[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.