2026 ICD-10-CM Diagnosis Code H16.032Corneal ulcer with hypopyon, left eye

ICD-10-CM Codes›H00–H59›H15-H22›H16

ICD-10-CM H16.032
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H16.032 is a billable ICD-10-CM diagnosis code for corneal ulcer with hypopyon, left eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 121 through 122. Coders also document this condition as corneal ulcer with hypopyon of left eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H16.032
Billable Status
Yes — Valid for Submission
Code Describes
Corneal ulcer with hypopyon, left eye
Short Description
Corneal ulcer with hypopyon, left eye
Same as the full description in the CMS dataset.
Parent Code
H16.03
Corneal ulcer with hypopyon

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH16Keratitis
This CodeH16.032Corneal ulcer with hypopyon, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Corneal ulcer with hypopyon of left eye
  • Hypopyon
  • Hypopyon of left eye
  • Hypopyon ulcer

Clinical ClassificationClinical

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

CCSR EYE001
Cornea and external disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Hypopyon

    an accumulation of pus in the anterior chamber of the eye.

Patient EducationClinical

Corneal Disorders

Your cornea is the outermost layer of your eye. It is clear and shaped like a dome. The cornea helps to shield the rest of the eye from germs, dust, and other harmful matter. It also helps your eye to focus. If you wear contact lenses, they float on top of your corneas.

Read the full article at MedlinePlus

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Convert H16.032 to ICD-9-CMHistory

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

ICD-9-CM
370.04 Hypopyon ulcer
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 H16.032Overview

Is H16.032 (Corneal ulcer with hypopyon) a billable code?

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

What MS-DRG does H16.032 group to?

When corneal ulcer with hypopyon, left eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 121, 122, with relative weights from 0.7858 to 1.1633 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H16.032?

Under the General Equivalence Mappings, corneal ulcer with hypopyon, left eye converts to ICD-9-CM 370.04 (hypopyon ulcer). 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.