2026 ICD-10-CM Diagnosis Code H57.02Anisocoria

ICD-10-CM Codes›H00–H59›H55-H57›H57

ICD-10-CM H57.02
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H57.02 is a billable ICD-10-CM diagnosis code for anisocoria. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders.

Code Identity

ICD-10-CM Code
H57.02
Billable Status
Yes — Valid for Submission
Code Describes
Anisocoria
Short Description
Anisocoria
Same as the full description in the CMS dataset.
Parent Code
H57.0
Anomalies of pupillary function

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH55-H57Other disorders of eye and adnexa
CategoryH57Other disorders of eye and adnexa
This CodeH57.02Anisocoria

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anisocoria
  • Episodic anisocoria
  • Finding of proportion of pupil
  • Pharmacologic anisocoria
  • Physiologic anisocoria

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Anisocoria(pupil)
    • Anomaly, anomalous(congenital) (unspecified type)
      • pupil
        • function
          • anisocoria

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE012
Other specified eye disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Anisocoria

    unequal pupil size, which may represent a benign physiologic variant or a manifestation of disease. pathologic anisocoria reflects an abnormality in the musculature of the iris (iris diseases) or in the parasympathetic or sympathetic pathways that innervate the pupil. physiologic anisocoria refers to an asymmetry of pupil diameter, usually less than 2mm, that is not associated with disease.

  • Iris Diseases

    diseases, dysfunctions, or disorders of or located in the iris.

Patient EducationClinical

Eye Diseases

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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H57.02 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
379.41 Anisocoria
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H57.02Overview

Is H57.02 (Anomalies of pupillary function) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report anisocoria on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of H57.02?

Under the General Equivalence Mappings, anisocoria converts to ICD-9-CM 379.41 (anisocoria). The mapping is a direct match.

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.