2026 ICD-10-CM Diagnosis Code H16.263Vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral

ICD-10-CM Codes›H00–H59›H15-H22›H16

ICD-10-CM H16.263
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H16.263 is a billable ICD-10-CM diagnosis code for vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H16.263
Billable Status
Yes — Valid for Submission
Code Describes
Vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral
Short Description
Vernal keratoconjunct, w limbar and corneal involv, bi
Parent Code
H16.26
Vernal keratoconjunctivitis, with limbar and corneal involvement

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH16Keratitis
This CodeH16.263Vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral

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.

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Convert H16.263 to ICD-9-CMHistory

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

ICD-9-CM
370.32 Limbar keratoconjunctiv
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
372.13 Vernal conjunctivitis
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 H16.263Overview

Is H16.263 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H16.263 group to?

When vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral 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 H16.263?

Under the General Equivalence Mappings, vernal keratoconjunctivitis, with limbar and corneal involvement, bilateral converts to ICD-9-CM 370.32 (limbar keratoconjunctiv) and 372.13 (vernal conjunctivitis). 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.