B34.9 – Viral infection, unspecified

ICD-10-CM 2027 diagnosis code · Other viral diseases

Billable code

ICD-10-CM code B34.9

Code: B34.9 (claims format: B349)
Description: Viral infection, unspecified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: B25-B34 Other viral diseases
Parent codes: B34

Notes for B34.9

Applicable to:

Viremia NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

B34 – Viral infection of unspecified site

Excludes1 (not coded here):

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)

Index terms for B34.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in B34

B34.0 – Adenovirus infection, unspecifiedBillable
B34.1 – Enterovirus infection, unspecifiedBillable
B34.2 – Coronavirus infection, unspecifiedBillable
B34.3 – Parvovirus infection, unspecifiedBillable
B34.4 – Papovavirus infection, unspecifiedBillable
B34.8 – Other viral infections of unspecified siteBillable

Frequently asked questions

What is ICD-10 code B34.9?

B34.9 is the ICD-10-CM code for viral infection, unspecified, in the block B25-B34 (Other viral diseases).

Is B34.9 a billable code?

Yes. B34.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does B34.9 belong to?

It belongs to category B34 – Viral infection of unspecified site.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.