2026 ICD-10-CM Diagnosis Code B00.51Herpesviral iridocyclitis

ICD-10-CM Codes›A00–B99›B00-B09›B00

ICD-10-CM B00.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B00.51 is a billable ICD-10-CM diagnosis code for herpesviral iridocyclitis. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders and Viral infection.

Code Identity

ICD-10-CM Code
B00.51
Billable Status
Yes — Valid for Submission
Code Describes
Herpesviral iridocyclitis
Short Description
Herpesviral iridocyclitis
Same as the full description in the CMS dataset.
Parent Code
B00.5
Herpesviral ocular disease

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB00-B09Viral infections characterized by skin and mucous membrane lesions
CategoryB00Herpesviral [herpes simplex] infections
This CodeB00.51Herpesviral iridocyclitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral herpes simplex iridocyclitis
  • Bilateral iritis of eyes caused by Human alphaherpesvirus
  • Herpes simplex iridocyclitis
  • Herpes simplex iritis
  • Herpes simplex keratouveitis
  • Herpes simplex type 1 infection
  • Herpetic iridocyclitis
  • Iridocyclitis of bilateral eyes
  • Iridocyclitis of left eye caused by human herpes simplex virus
  • Iridocyclitis of right eye caused by human herpes simplex virus
  • Iritis of left eye caused by herpes simplex virus
  • Iritis of right eye caused by herpes simplex virus
  • Keratouveitis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Herpesviral iritis
  • Herpesviral uveitis, anterior

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.

    • Herpes, herpesvirus, herpetic
      • iridocyclitis (simplex)
    • Herpes, herpesvirus, herpetic
      • iritis (simplex)
    • Iridocyclitis
      • herpes, herpetic (simplex)
    • Iridocyclitis
      • in (due to)
        • herpes (simplex) virus
    • Iritis
      • due to
        • herpes simplex

Clinical ClassificationClinical

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

CCSR EYE012
Other specified eye disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Herpes Simplex

Herpes is an infection that is caused by a herpes simplex virus (HSV). Oral herpes causes cold sores around the mouth or face. Genital herpes affects the genitals, buttocks or anal area. Genital herpes is a sexually transmitted infection (STI). It affects the genitals, buttocks or anal area.

Read the full article at MedlinePlus

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

Convert B00.51 to ICD-9-CMHistory

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

ICD-9-CM
054.44 H simplex iridocyclitis
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 B00.51Overview

Is B00.51 (Herpesviral ocular disease) a billable code?

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

What MS-DRG does B00.51 group to?

When herpesviral iridocyclitis 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 B00.51?

Under the General Equivalence Mappings, herpesviral iridocyclitis converts to ICD-9-CM 054.44 (h simplex iridocyclitis). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.