2027 ICD-10-CM Diagnosis Code B09Unspecified viral infection characterized by skin and mucous membrane lesions
ICD-10-CM Codes›A00–B99›B00-B09›B09
- Billable — Valid for Submission
- Not Chronic
B09 is a billable ICD-10-CM diagnosis code for unspecified viral infection characterized by skin and mucous membrane lesions. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 865 through 866. Coders also document this condition as keratitis in exanthema. 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.
- Keratitis in exanthema
- Oral mucosal viral disease
- Viral exanthem
- Viral infection of skin
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B09: its own notes plus those printed at 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.
- Viral enanthema NOS
- Viral exanthema NOS
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Exanthem, exanthema See Also: Rash;
Keratitis (nodular) (nonulcerative) (simple) (zonular) H16.9
exanthema See Also: Exanthem; B09
in exanthema See Also: Exanthem; B09
Roseola B09
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Viral Infections
Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease.
The full article covers:
- What are viruses?
- How are viruses spread?
- How do viruses cause disease?
- What are the treatments for viral infections?
- Can viral infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B09 to ICD-9-CMHistory
Code HistoryHistory
Questions About B09Overview
Is B09 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified viral infection characterized by skin and mucous membrane lesions on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B09 group to?
When unspecified viral infection characterized by skin and mucous membrane lesions is the principal diagnosis on an inpatient stay, it groups to MS-DRG 866, 865, with relative weights from 0.8691 to 1.3153 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of B09?
Under the General Equivalence Mappings, unspecified viral infection characterized by skin and mucous membrane lesions converts to ICD-9-CM 057.8 (viral exanthemata NEC) and 057.9 (viral exanthemata NOS). The mapping is approximate, so confirm the match fits the documentation.
