2026 ICD-10-CM Diagnosis Code B30.9Viral conjunctivitis, unspecified

ICD-10-CM Codes›A00–B99›B25-B34›B30

ICD-10-CM B30.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B30.9 is a billable ICD-10-CM diagnosis code for viral conjunctivitis, unspecified. 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 acute epidemic conjunctivitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease and Viral infection.

Code Identity

ICD-10-CM Code
B30.9
Billable Status
Yes — Valid for Submission
Code Describes
Viral conjunctivitis, unspecified
Short Description
Viral conjunctivitis, unspecified
Same as the full description in the CMS dataset.
Parent Code
B30
Viral conjunctivitis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB25-B34Other viral diseases
CategoryB30Viral conjunctivitis
This CodeB30.9Viral conjunctivitis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute epidemic conjunctivitis
  • Bilateral viral conjunctivitis
  • Conjunctivitis of left eye caused by virus
  • Conjunctivitis of right eye caused by virus
  • Viral conjunctivitis

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
      • epidemic (viral)
    • Conjunctivitis(staphylococcal) (streptococcal) NOS
      • viral
    • Disease, diseased
      • conjunctiva
        • viral

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
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Viral Conjunctivitis

    conjunctivitis resulting from viral infection.

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 B30.9 to ICD-9-CMHistory

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

ICD-9-CM
077.99 Unsp ds conjuc viruses
Exact Match The mapping is direct, with no qualifiers.

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 B30.9Overview

Is B30.9 (Viral conjunctivitis) a billable code?

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

What MS-DRG does B30.9 group to?

When viral conjunctivitis, unspecified 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 B30.9?

Under the General Equivalence Mappings, viral conjunctivitis, unspecified converts to ICD-9-CM 077.99 (unsp ds conjuc viruses). The mapping is a direct match.

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.