ICD-10-CM 2027
ICD-10 code for enterovirus infection
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › enterovirus”. Page updated September 29, 2026.
About coding enterovirus infection
The ICD-10-CM code for enterovirus infection is B34.1 (Enterovirus infection, unspecified). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B34.1.
Within B34, choose B34.1 (Enterovirus infection, unspecified) only when documentation doesn't support a more specific option: adenovirus infection, unspecified (B34.0), coronavirus infection, unspecified (B34.2), Parvovirus infection, unspecified (B34.3), Papovavirus infection, unspecified (B34.4), other viral infections of unspecified site (B34.8) and viral infection, unspecified (B34.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific enterovirus infection codes (official index)
- as cause of disease classified elsewhere B97.10 — Unspecified enterovirus as the cause of diseases classified elsewhere
- coxsackievirus B97.11 — Coxsackievirus as the cause of diseases classified elsewhere
- echovirus B97.12 — Echovirus as the cause of diseases classified elsewhere
- specified NEC B97.19 — Other enterovirus as the cause of diseases classified elsewhere
Common questions about enterovirus infection ICD-10 codes
What is the ICD-10 code for enterovirus infection?
- B34.1 — Enterovirus infection, unspecified. More specific codes apply when the documentation supports them: B97.10, B97.11, B97.12, B97.19.
Is B34.1 billable?
- Yes. B34.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B34.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B34.1 as a principal diagnosis.
Is B34.1 a CC or MCC?
- No. B34.1 is neither a CC nor an MCC under MS-DRG v44.0.