ICD-10-CM 2027
ICD-10 code for Congo virus fever
From the official ICD-10-CM alphabetic index entry “Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Congo virus”. Page updated September 29, 2026.
About coding Congo virus fever
The ICD-10-CM code for Congo virus fever is A98.0 (Crimean-Congo hemorrhagic fever).
Within A98 (other viral hemorrhagic fevers, not elsewhere classified), A98.0 is specifically for Crimean-Congo hemorrhagic fever. Related codes cover Omsk hemorrhagic fever (A98.1), Kyasanur Forest disease (A98.2), Marburg virus disease (A98.3), Ebola virus disease (A98.4), hemorrhagic fever with renal syndrome (A98.5) and other specified viral hemorrhagic fevers (A98.8).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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 Congo virus fever ICD-10 codes
What is the ICD-10 code for Congo virus fever?
- A98.0 — Crimean-Congo hemorrhagic fever.
Is A98.0 billable?
- Yes. A98.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A98.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A98.0 as a principal diagnosis.
Is A98.0 a CC or MCC?
- A98.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.