2026 ICD-10-CM Diagnosis Code B02.31Zoster conjunctivitis

ICD-10-CM Codes›A00–B99›B00-B09›B02

ICD-10-CM B02.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B02.31 is a billable ICD-10-CM diagnosis code for zoster 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, 974 through 976. Coders also document this condition as bilateral conjunctivitis of eyes caused by herpes zoster virus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease and Viral infection.

Code Identity

ICD-10-CM Code
B02.31
Billable Status
Yes — Valid for Submission
Code Describes
Zoster conjunctivitis
Short Description
Zoster conjunctivitis
Same as the full description in the CMS dataset.
Parent Code
B02.3
Zoster ocular disease

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB00-B09Viral infections characterized by skin and mucous membrane lesions
CategoryB02Zoster [herpes zoster]
This CodeB02.31Zoster conjunctivitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral conjunctivitis of eyes caused by herpes zoster virus
  • Bilateral viral conjunctivitis
  • Conjunctivitis of left eye caused by herpes zoster virus
  • Conjunctivitis of right eye caused by herpes zoster virus
  • Disorder of left trigeminal nerve
  • Disorder of right trigeminal nerve
  • Herpes zoster 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
      • herpes zoster
    • Conjunctivitis(staphylococcal) (streptococcal) NOS
      • in (due to)
        • herpes (simplex) virus
          • zoster
    • Conjunctivitis(staphylococcal) (streptococcal) NOS
      • in (due to)
        • zoster
    • Herpes, herpesvirus, herpetic
      • conjunctivitis (simplex)
        • zoster
    • Herpes, herpesvirus, herpetic
      • zoster
        • conjunctivitis

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

Patient EducationClinical

Shingles

Shingles (herpes zoster) is an infection that causes a painful rash. It is caused by the varicella-zoster virus (VZV). This is the same virus that causes chickenpox. After you have chickenpox, the virus stays in your body. It may not cause problems for many years. But as you get older, the virus may become active again and cause shingles.

The full article covers:

  • What is shingles?
  • Is shingles contagious?
  • Who is at risk for shingles?
  • What are the symptoms of shingles?
  • What other problems can shingles cause?
  • How is shingles diagnosed?
  • What are the treatments for shingles?
  • Can shingles be prevented?

Read the full article at MedlinePlus

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

Convert B02.31 to ICD-9-CMHistory

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

ICD-9-CM
053.29 Herpes zoster of eye 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 B02.31Overview

Is B02.31 (Zoster ocular disease) a billable code?

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

What MS-DRG does B02.31 group to?

When zoster conjunctivitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, 974, 975, 976, with relative weights from 0.7678 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B02.31?

Under the General Equivalence Mappings, zoster conjunctivitis converts to ICD-9-CM 053.29 (herpes zoster of eye 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.