B33.8Other specified viral diseases

B33.8 is the ICD-10-CM diagnosis code for other specified viral diseases. It belongs to category B33 (other viral diseases, not elsewhere classified), block B25-B34 (other viral diseases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within B33, choose B33.8 (Other specified viral diseases) only when documentation doesn't support a more specific option: epidemic myalgia (B33.0), Ross River disease (B33.1), viral carditis (B33.2), retrovirus infections, not elsewhere classified (B33.3) and Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] (B33.4).

Don't report B33.8 together with the conditions in its Excludes1 note: anogenital human papillomavirus infection (A63.0) and viral warts due to human papillomavirus infection (B07).

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 078.2 (Sweating fever), 078.89 (other specified diseases due to viruses) and 079.89 (other specified viral infection).