2026 ICD-10-CM Diagnosis Code H10.45Other chronic allergic conjunctivitis

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.45
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H10.45 is a billable ICD-10-CM diagnosis code for other chronic allergic conjunctivitis. 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 allergic conjunctivitis of left eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Allergic reactions and Cornea and external disease.

Code Identity

ICD-10-CM Code
H10.45
Billable Status
Yes — Valid for Submission
Code Describes
Other chronic allergic conjunctivitis
Short Description
Other chronic allergic conjunctivitis
Same as the full description in the CMS dataset.
Parent Code
H10.4
Chronic conjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.45Other chronic allergic conjunctivitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergic conjunctivitis of left eye
  • Allergic conjunctivitis of right eye
  • Chronic allergic conjunctivitis
  • Limbal AND/OR corneal involvement in vernal conjunctivitis
  • Limbal vernal conjunctivitis
  • Perennial allergic conjunctivitis
  • Perennial allergic conjunctivitis of left eye
  • Perennial allergic conjunctivitis of right eye
  • Vernal conjunctivitis
  • Vernal keratoconjunctivitis

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.

    • Conjunctivitis(staphylococcal) (streptococcal) NOS
      • allergic (acute)
        • chronic
    • Conjunctivitis(staphylococcal) (streptococcal) NOS
      • chronic (nodosa) (petrificans) (phlyctenular)
        • allergic

Clinical ClassificationClinical

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

CCSR INJ031
Allergic reactions
Default principal diagnosis: inpatient No · outpatient No
CCSR EYE001
Cornea and external disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Vernal Conjunctivitis

    inflammation of the cornea that is seasonal in nature.

Patient EducationClinical

Pink Eye

Conjunctivitis is the medical name for pink eye. It involves inflammation of the outer layer of the eye and inside of the eyelid. It can cause swelling, itching, burning, discharge, and redness. Causes include:

Read the full article at MedlinePlus

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

Convert H10.45 to ICD-9-CMHistory

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

ICD-9-CM
372.14 Chr allrg conjunctiv NEC
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 H10.45Overview

Is H10.45 (Chronic conjunctivitis) a billable code?

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

What MS-DRG does H10.45 group to?

When other chronic allergic conjunctivitis 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 H10.45?

Under the General Equivalence Mappings, other chronic allergic conjunctivitis converts to ICD-9-CM 372.14 (chr allrg conjunctiv NEC). 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.