ICD-10-CM Code For Nystagmus And Other Irregular Eye Movements: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group H55 includes diagnoses for nystagmus and other irregular or involuntary eye movements, covering congenital forms, acquired forms, and nonspecific ocular motor disturbances. These ICD-10-CM diagnosis codes are used to document episodes of involuntary eye movement, capture associated neurologic or ocular involvement, and reflect disease severity or chronicity when present. Accurate coding within the ICD-10-CM H55 group supports proper claim adjudication through precise diagnostic documentation and appropriate reimbursement.

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ICD-10-CM H55: Nystagmus And Other Irregular Eye Movements Overview

The diagnoses in this group describe involuntary, repetitive, or irregular eye movements that can impair vision and indicate underlying neurologic or ocular disease. These conditions affect the ocular motor system and surrounding adnexa and may be congenital or acquired. Accurate coding matters for appropriate claim processing and reflecting clinical complexity related to visual function.

When to Use

Use a code from this group when documentation indicates involuntary, repetitive, or irregular eye movements such as nystagmus or related ocular motor dysfunction. Select the specific code based on etiology, laterality, and whether the condition is congenital, acquired, or unspecified as documented.

ICD-10-CM Codes

9 rows

ICD-10-CM Code	Description
H55.00	Unspecified nystagmus
H55.01	Congenital nystagmus
H55.02	Latent nystagmus
H55.03	Visual deprivation nystagmus
H55.04	Dissociated nystagmus
H55.09	Other forms of nystagmus
H55.81	Deficient saccadic eye movements
H55.82	Deficient smooth pursuit eye movements
H55.89	Other irregular eye movements

DRG Codes

3 rows

DRG Code	Description
123	Neurological Eye Disorders
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC

Typical Clinical Scenarios

An adult presents to the emergency department with sudden onset, rhythmic horizontal oscillations of the eyes after a head trauma sustained in a motor vehicle collision; the patient reports blurred vision and imbalance. The ED documents acute, binocular nystagmus observed on exam and orders neuroimaging to evaluate for central lesions. A code from this group is assigned for the acute traumatic-onset nystagmus as part of the ED diagnosis. Typical codes: H55.01, H55.03
A child is evaluated in pediatric ophthalmology for intermittent, involuntary, conjugate eye movements noted since infancy that cause reduced visual fixation and amblyopia risk; vision testing shows reduced acuity and this has been a chronic, stable problem. The clinician documents congenital or infantile manifest nystagmus with associated reduced visual function and prescribes monitoring and rehab measures. A chronic nystagmus code from this group is used to describe the long-standing ocular motility disorder. Typical codes: H55.00, H55.02
An adult with multiple sclerosis attends neurology follow-up for worsening diplopia and irregular, jerk-type vertical eye movements that developed during a recent exacerbation; these eye movement abnormalities are noted as a neurologic complication of the underlying demyelinating disease. The neurologist assigns a specific code from this group to capture the irregular eye movement as a comorbidity influencing function and management. Typical codes: H55.04, H55.89

Related Codes

H57-OTHER-DISORDERS-OF-EYE-AND-ADNEXA

ICD-10-CM Code For Other Disorders Of Eye And Adnexa: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

9 rows

ICD-10-CM Code	Description
H55.00	Unspecified nystagmus
H55.01	Congenital nystagmus
H55.02	Latent nystagmus
H55.03	Visual deprivation nystagmus
H55.04	Dissociated nystagmus
H55.09	Other forms of nystagmus
H55.81	Deficient saccadic eye movements
H55.82	Deficient smooth pursuit eye movements
H55.89	Other irregular eye movements

DRG Codes

3 rows

DRG Code	Description
123	Neurological Eye Disorders
124	Other Disorders of the Eye with MCC or Thrombolytic Agent
125	Other Disorders of the Eye without MCC

Typical Clinical Scenarios

An adult presents to the emergency department with sudden onset, rhythmic horizontal oscillations of the eyes after a head trauma sustained in a motor vehicle collision; the patient reports blurred vision and imbalance. The ED documents acute, binocular nystagmus observed on exam and orders neuroimaging to evaluate for central lesions. A code from this group is assigned for the acute traumatic-onset nystagmus as part of the ED diagnosis. Typical codes: H55.01, H55.03
A child is evaluated in pediatric ophthalmology for intermittent, involuntary, conjugate eye movements noted since infancy that cause reduced visual fixation and amblyopia risk; vision testing shows reduced acuity and this has been a chronic, stable problem. The clinician documents congenital or infantile manifest nystagmus with associated reduced visual function and prescribes monitoring and rehab measures. A chronic nystagmus code from this group is used to describe the long-standing ocular motility disorder. Typical codes: H55.00, H55.02
An adult with multiple sclerosis attends neurology follow-up for worsening diplopia and irregular, jerk-type vertical eye movements that developed during a recent exacerbation; these eye movement abnormalities are noted as a neurologic complication of the underlying demyelinating disease. The neurologist assigns a specific code from this group to capture the irregular eye movement as a comorbidity influencing function and management. Typical codes: H55.04, H55.89

Related Codes

H57-OTHER-DISORDERS-OF-EYE-AND-ADNEXA

ICD-10-CM Code For Other Disorders Of Eye And Adnexa: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Nystagmus And Other Irregular Eye Movements: Group Overview

Sign up for ICD-10-CM Code For Nystagmus And Other Irregular Eye Movements: Group Overview policy alerts

ICD-10-CM H55: Nystagmus And Other Irregular Eye Movements Overview

ICD-10-CM Code For Nystagmus And Other Irregular Eye Movements: Group Overview

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ICD-10-CM H55: Nystagmus And Other Irregular Eye Movements Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in ICD-10-CM code group `H55`?

How does accurate coding within `H55` affect reimbursement?

What do the specific codes like `H55.01` and `H55.03` represent?

Which DRGs are associated with the `H55` diagnosis group?

When should a coder use `H55.00` versus `H55.09`?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in ICD-10-CM code group `H55`?

How does accurate coding within `H55` affect reimbursement?

What do the specific codes like `H55.01` and `H55.03` represent?

Which DRGs are associated with the `H55` diagnosis group?

When should a coder use `H55.00` versus `H55.09`?

References