2026 ICD-10-CM Diagnosis Code H57.051Tonic pupil, right eye

ICD-10-CM Codes›H00–H59›H55-H57›H57

ICD-10-CM H57.051
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H57.051 is a billable ICD-10-CM diagnosis code for tonic pupil, right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as light near dissociated pupil. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders.

Code Identity

ICD-10-CM Code
H57.051
Billable Status
Yes — Valid for Submission
Code Describes
Tonic pupil, right eye
Short Description
Tonic pupil, right eye
Same as the full description in the CMS dataset.
Parent Code
H57.05
Tonic pupil

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH55-H57Other disorders of eye and adnexa
CategoryH57Other disorders of eye and adnexa
This CodeH57.051Tonic pupil, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Light near dissociated pupil
  • Tonic pupillary reaction
  • Tonic pupillary reaction of right eye

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

  • Tonic Pupil

    a pupillary abnormality characterized by a poor pupillary light reaction, reduced accommodation, iris sector palsies, an enhanced pupillary response to near effort that results in a prolonged, tonic constriction, and slow pupillary redilation. this condition is associated with injury to the postganglionic parasympathetic innervation to the pupil. (from miller et al., clinical neuro-ophthalmology, 4th ed, pp492-500)

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Convert H57.051 to ICD-9-CMHistory

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

ICD-9-CM
379.46 Tonic pupillary reaction
Approximate The match is approximate rather than exact.

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 H57.051Overview

Is H57.051 (Tonic pupil) a billable code?

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

What is the ICD-9 equivalent of H57.051?

Under the General Equivalence Mappings, tonic pupil, right eye converts to ICD-9-CM 379.46 (tonic pupillary reaction). The mapping is approximate, so confirm the match fits the documentation.

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.