2026 ICD-10-CM Diagnosis Code H10.523Angular blepharoconjunctivitis, bilateral

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.523
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H10.523 is a billable ICD-10-CM diagnosis code for angular blepharoconjunctivitis, 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. Coders also document this condition as angular blepharitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H10.523
Billable Status
Yes — Valid for Submission
Code Describes
Angular blepharoconjunctivitis, bilateral
Short Description
Angular blepharoconjunctivitis, bilateral
Same as the full description in the CMS dataset.
Parent Code
H10.52
Angular blepharoconjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.523Angular blepharoconjunctivitis, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angular blepharitis
  • Angular blepharitis of left eyelid
  • Angular blepharitis of right eyelid
  • Angular blepharoconjunctivitis
  • Angular blepharoconjunctivitis of right eye
  • Bilateral angular blepharitis
  • Bilateral angular blepharoconjunctivitis of eyes
  • Bilateral blepharitis
  • Bilateral eye blepharoconjunctivitis
  • Left angular blepharoconjunctivitis

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

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 H10.523 to ICD-9-CMHistory

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

ICD-9-CM
372.21 Angular blepharoconjunct
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 H10.523Overview

Is H10.523 (Angular blepharoconjunctivitis) a billable code?

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

What MS-DRG does H10.523 group to?

When angular blepharoconjunctivitis, 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 H10.523?

Under the General Equivalence Mappings, angular blepharoconjunctivitis, bilateral converts to ICD-9-CM 372.21 (angular blepharoconjunct). 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.