2026 ICD-10-CM Diagnosis Code H17.821Peripheral opacity of cornea, right eye

ICD-10-CM Codes›H00–H59›H15-H22›H17

ICD-10-CM H17.821
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H17.821 is a billable ICD-10-CM diagnosis code for peripheral opacity of cornea, right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as degeneration of peripheral cornea of right eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H17.821
Billable Status
Yes — Valid for Submission
Code Describes
Peripheral opacity of cornea, right eye
Short Description
Peripheral opacity of cornea, right eye
Same as the full description in the CMS dataset.
Parent Code
H17.82
Peripheral opacity of cornea

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH17Corneal scars and opacities
This CodeH17.821Peripheral opacity of cornea, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Degeneration of peripheral cornea of right eye
  • Peripheral opacity of cornea
  • Peripheral opacity of right cornea

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

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

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

Convert H17.821 to ICD-9-CMHistory

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

ICD-9-CM
371.02 Periph opacity of cornea
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 H17.821Overview

Is H17.821 (Peripheral opacity of cornea) a billable code?

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

What MS-DRG does H17.821 group to?

When peripheral opacity of cornea, right eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H17.821?

Under the General Equivalence Mappings, peripheral opacity of cornea, right eye converts to ICD-9-CM 371.02 (periph opacity of cornea). 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.