B34

Non-Billable

ChapterA00–B99

Rankcategory

Official Description

Viral infection of unspecified site

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes

diseases generally recognized as communicable or transmissible

Excludes1(Not coded here)

certain localized infections - see body system-related chapters

Excludes2(Not included here)

carrier or suspected carrier of infectious disease (Z22.-)
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

code to identify resistance to antimicrobial drugs (Z16.-)

Instructional Notes

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)

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)

B25-B34Other viral diseases (B25-B34)

B34Viral infection of unspecified site

B34.0Adenovirus infection, unspecified

B34.1Enterovirus infection, unspecified

B34.2Coronavirus infection, unspecified

B34.3Parvovirus infection, unspecified

B34.4Papovavirus infection, unspecified

B34.8Other viral infections of unspecified site

B34.9Viral infection, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to B34:

chapterCH1

Certain infectious and parasitic diseases (A00-B99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to B34. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths

Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)1 unique routes

in (due to)

viral disease NEC→B34

Coxsackie (virus) (infection)1 unique routes

Direct index entry→B34

Disease, diseased7 unique routes

coxsackie (virus) NEC→B34

echovirus NEC→B34

enteroviral, enterovirus NEC→B34

nonarthropod-borne NOS (viral)→B34(2 variants)

enterovirus NEC→B34