Nystagmus and other irregular eye movements (H55) ICD-10-CM
The H55 code range covers nystagmus and other irregular eye movements with 12 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the H55 Range 12 codes · 9 billable
- H55 Nystagmus and other irregular eye movementsNon-billable
- H55.0 NystagmusNon-billable
- 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
- H55.8 Other irregular eye movementsNon-billable
- H55.81 Deficient saccadic eye movements
- H55.82 Deficient smooth pursuit eye movements
- H55.89 Other irregular eye movements
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the H55 range.
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)
About the H55 Code Range
The ICD-10 code section H55 is specifically used to classify various types of nystagmus and irregular eye movements. These codes precisely identify different forms of involuntary eye motion, helping healthcare professionals document, diagnose, and bill for these distinct eye movement disorders.
This section covers a range of conditions including nystagmus (H55.0), which is a repetitive, uncontrolled eye movement often described by terms like "manifest nystagmus" or "idiopathic nystagmus." More detailed codes such as H55.00 specify unspecified nystagmus, while H55.01 identifies congenital nystagmus, known also as "congenital periodic alternating nystagmus" or "pendular nystagmus." Other specific types include latent nystagmus (H55.02), visual deprivation nystagmus (H55.03), and dissociated nystagmus (H55.04). The code H55.09 encompasses other forms like vertical, gaze-evoked, and acquired nystagmus. Additionally, irregular eye movements outside typical nystagmus, such as deficient saccadic eye movements (H55.81) and deficient smooth pursuit movements (H55.82), are included under H55.8 codes. These detailed distinctions assist in selecting the exact diagnostic code for billing and clinical records for disorders involving involuntary or abnormal eye movement patterns.
Questions About This Page
How many billable codes are in the H55 range?
Of the 12 codes in this range, 9 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the H55 range classify?
The range classifies nystagmus and other irregular eye movements. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
