ICD-10-CM 2027
ICD-10 code for Viremia
From the official ICD-10-CM alphabetic index entry “Viremia”. Page updated September 29, 2026.
About coding Viremia
The ICD-10-CM code for Viremia is B34.9 (Viral infection, unspecified).
Within B34, choose B34.9 (Viral infection, unspecified) only when documentation doesn't support a more specific option: adenovirus infection, unspecified (B34.0), enterovirus infection, unspecified (B34.1), coronavirus infection, unspecified (B34.2), Parvovirus infection, unspecified (B34.3), Papovavirus infection, unspecified (B34.4) and other viral infections of unspecified site (B34.8).
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.
Common questions about Viremia ICD-10 codes
What is the ICD-10 code for Viremia?
- B34.9 — Viral infection, unspecified.
Is B34.9 billable?
- Yes. B34.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B34.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B34.9 as a principal diagnosis.
Is B34.9 a CC or MCC?
- No. B34.9 is neither a CC nor an MCC under MS-DRG v44.0.