2026 ICD-10-CM Diagnosis Code H10.821Rosacea conjunctivitis, right eye

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.821
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H10.821 is a billable ICD-10-CM diagnosis code for rosacea conjunctivitis, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H10.821
Billable Status
Yes — Valid for Submission
Code Describes
Rosacea conjunctivitis, right eye
Short Description
Rosacea conjunctivitis, right eye
Same as the full description in the CMS dataset.
Parent Code
H10.82
Rosacea conjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.821Rosacea conjunctivitis, right eye

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.

Code History & ChangesHistory

Replacement H10.821 replaces the following previously assigned code(s):

  • H10.89 - Other conjunctivitis
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H10.821Overview

Is H10.821 (Rosacea conjunctivitis) a billable code?

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

What MS-DRG does H10.821 group to?

When rosacea conjunctivitis, 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.

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.