Unspecified viral infection characterized by skin and mucous membrane lesions
In Viral infections characterized by skin and mucous membrane lesions (B00-B09), chapter 1: Certain Infectious and Parasitic Diseases
- B09 is an unspecified code: use it only when the record doesn't document anything more specific. If the record has more detail, check the other codes under B00-B09 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
Also indexed as: Enanthema; Encephalitis, postexanthematous NEC; Exanthem, viral, virus; Infection, virus, viral NOS, exanthem NOS; Keratitis, in, exanthema; Keratoconjunctivitis, in exanthema; Roseola
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Instructional notes
Includes: conditions that are coded here
- Viral enanthema NOS
- Viral exanthema NOS
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
Other codes under B00-B09
Viral infections characterized by skin and mucous membrane lesions (B00-B09)
- B00Herpesviral [herpes simplex] infections
- B01Varicella [chickenpox]
- B02Zoster [herpes zoster]
- B03Smallpox
- B04Monkeypox
- B05Measles
- B06Rubella [German measles]
- B07Viral warts
- B08Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified
- B09Unspecified viral infection characterized by skin and mucous membrane lesions(this code)
B09 MS-DRGs
As the principal diagnosis, B09 groups to MS-DRG 865 or 866 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
B09 is in Viral infection (INF008, its default category), with 309 codes. Others in it:
Other codes that refer to B09
Notes on these codes point to B09.
- O98.5 Includes: Conditions in A80-B09, B25-B34, R87.81-, R87.82-
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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. Some of the diseases that viruses can cause include the common cold, the flu, COVID-19, and HIV.
Read more about viral infections on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 057.8 Other specified viral exanthemata (approximate)
- 057.9 Viral exanthem, unspecified (approximate)