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B34.9 — Viral infection, unspecified
B34.9
What this code means
An illness caused by a virus, where tests do not identify a specific virus or site.
Also called: viral infection, viral illness.
When this code is used
Used for a viral infection of unspecified type and site.
Where it sits in ICD-10-CM
Code B34.9 belongs to Chapter 1: Infectious and parasitic diseases, which covers codes A00–B99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Frequently asked questions
What is ICD-10-CM code B34.9?
B34.9 is the ICD-10-CM diagnosis code for “Viral infection, unspecified”. An illness caused by a virus, where tests do not identify a specific virus or site.
When is code B34.9 used?
Used for a viral infection of unspecified type and site. It belongs to Chapter 1 of ICD-10-CM (Infectious and parasitic diseases).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.