ICD-10-CM 2027
ICD-10 code for Rift Valley viral fever
From the official ICD-10-CM alphabetic index entry “Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Rift Valley (viral)”. Page updated September 29, 2026.
About coding Rift Valley viral fever
The ICD-10-CM code for Rift Valley viral fever is A92.4 (Rift Valley fever).
Within A92 (other mosquito-borne viral fevers), A92.4 is specifically for Rift Valley fever. Related codes cover Chikungunya virus disease (A92.0), O'nyong-nyong fever (A92.1), Venezuelan equine fever (A92.2), West Nile virus infection (A92.3), Zika virus disease (A92.5), other specified mosquito-borne viral fevers (A92.8) and mosquito-borne viral fever, unspecified (A92.9).
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 Rift Valley viral fever ICD-10 codes
What is the ICD-10 code for Rift Valley viral fever?
- A92.4 — Rift Valley fever.
Is A92.4 billable?
- Yes. A92.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A92.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A92.4 as a principal diagnosis.
Is A92.4 a CC or MCC?
- A92.4 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.