2027 ICD-10-CM Diagnosis Code B00.51Herpesviral iridocyclitis
ICD-10-CM Codes›A00–B99›B00-B09›B00
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Chronic Condition
B00.51 is a billable ICD-10-CM diagnosis code for herpesviral iridocyclitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125, 791, 793, 974 through 976. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 10 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders and Viral infection.
Code Identity
Code Classification
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B00.51: its own notes plus those printed at B00 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Herpesviral iritis
- Herpesviral uveitis, anterior
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B00.51, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming B00.51: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 3
These codes carry an Excludes2 note naming B00.51: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Iritis See Also: Iridocyclitis;
herpes simplex B00.51
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About B00.51Overview
What is the ICD-10 code for herpesviral iridocyclitis?
The ICD-10-CM code for herpesviral iridocyclitis is B00.51 (sometimes written as B0051). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does B00.51 group to?
When herpesviral iridocyclitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 974, 125, 976, 975, 124, with relative weights from 0.7699 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B00.51 a CC or MCC?
CMS lists B00.51 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 10 closely related codes in its exclusion list.
Can B00.51 be reported with P35.2?
Not as a rule. The Excludes1 note at B00, which applies to B00.51, lists "congenital herpesviral infections (P35.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
