Is ICD-10-CM code B34 billable?

No, B34 (Viral infection of unspecified site) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code B34 belong to?

B34 belongs to Chapter 1 of the ICD-10-CM tabular list: A00–B99 (Certain Infectious and Parasitic Diseases).

B34Not billable, use a more specific code below

Viral infection of unspecified site

In Other viral diseases (B25-B34), chapter 1: Certain Infectious and Parasitic Diseases

7 billable codes under B34: 1 is a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Instructional notes

Excludes1: not coded here, use a different code

anogenital human papillomavirus infection (A63.0)
cytomegaloviral disease NOS (B25.9)
herpesvirus [herpes simplex] infection NOS (B00.9)
retrovirus infection NOS (B33.3)
viral agents as the cause of diseases classified elsewhere (B97.-)
viral warts due to human papillomavirus infection (B07)

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)

Read Section I.C.1 (page 19)

All codes under B34

B34 can't be used on a claim. Pick a billable code below; grey headings group them.

B34 MS-DRGs

As the principal diagnosis, all 7 billable codes under B34 group 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.

Other codes that refer to B34

Notes on these codes point to B34.

H67 Code First: viral disease NEC (B00-B34)
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.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.