2027 ICD-10-CM Diagnosis Code B00.9Herpesviral infection, unspecified
ICD-10-CM Codes›A00–B99›B00-B09›B00
- Billable — Valid for Submission
- Chronic Condition
B00.9 is a billable ICD-10-CM diagnosis code for herpesviral infection, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607, 974 through 976. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cellular changes consistent with Herpes simplex
- Chronic herpes simplex
- Chronic infection caused by herpes simplex virus co-occurrent with human immunodeficiency virus infection
- Combined Herpes simplex 1 and Herpes simplex 2 infection
- Herpes in pregnancy
- Herpes simplex
- Herpes simplex infection of buttock
- Herpes simplex infection of skin
- Herpes simplex type 1 infection
- Herpes simplex type 2 infection
- Herpesvirus infection
- Infection caused by herpes simplex virus co-occurrent with human immunodeficiency virus infection
- Infection of skin and/or mucous membrane caused by Herpes virus
- Nongenital herpes simplex
- Nongenital recurrent herpes simplex
- Otitis externa of left external auditory canal caused by Varicellovirus humanalpha3
- Otitis externa of right external auditory canal caused by Varicellovirus humanalpha3
- Primary herpes simplex
- Recurrent herpes simplex
- Recurrent herpes simplex infection of buttock
- Recurrent infection of skin caused by virus
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B00.9: 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.
- Herpes simplex infection NOS
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 B00.9, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming B00.9: they are not reported together with it, unless the two conditions are unrelated.
- B34 Viral infection of unspecified siteherpesvirus [herpes simplex] infection NOS (B00.9)
Excludes2 4
These codes carry an Excludes2 note naming B00.9: its condition is not part of those codes, and both may be reported when the patient has both.
- B10 Other human herpesvirusesherpes NOS (B00.9)
- B10 Other human herpesvirusesherpes simplex (B00.-) names B00.-, which includes this code
- B10 Other human herpesviruseshuman herpesvirus NOS (B00.-) names B00.-, which includes this code
- B10 Other human herpesviruseshuman herpesvirus 1 and 2 (B00.-) names B00.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
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 B00.9 to ICD-9-CMHistory
Code HistoryHistory
Questions About B00.9Overview
What is the ICD-10 code for herpesviral infection, unspecified?
The ICD-10-CM code for herpesviral infection, unspecified is B00.9 (sometimes written as B009). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B00.9 (Herpesviral [herpes simplex] infections) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report herpesviral infection, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B00.9 group to?
When herpesviral infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 607, 975, 606, with relative weights from 0.7879 to 3.0488 depending on complications. Higher weights mean higher Medicare reimbursement.
Can B00.9 be reported with P35.2?
Not as a rule. The Excludes1 note at B00, which applies to B00.9, 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).
What is the ICD-9 equivalent of B00.9?
Under the General Equivalence Mappings, herpesviral infection, unspecified converts to ICD-9-CM 054.8 (h simplex complicat NOS) and 054.9 (herpes simplex NOS). The mapping is approximate, so confirm the match fits the documentation.
