ICD-10-CM 2027
ICD-10 code for Lassa fever
From the official ICD-10-CM alphabetic index entry “Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Lassa”. Page updated September 29, 2026.
About coding Lassa fever
The ICD-10-CM code for Lassa fever is A96.2 (Lassa fever).
Within A96 (arenaviral hemorrhagic fever), A96.2 is specifically for Lassa fever. Related codes cover Junin hemorrhagic fever (A96.0), Machupo hemorrhagic fever (A96.1), other arenaviral hemorrhagic fevers (A96.8) and unspecified (A96.9).
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.
Common questions about Lassa fever ICD-10 codes
What is the ICD-10 code for Lassa fever?
- A96.2 — Lassa fever.
Is A96.2 billable?
- Yes. A96.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A96.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A96.2 as a principal diagnosis.
Is A96.2 a CC or MCC?
- No. A96.2 is neither a CC nor an MCC under MS-DRG v44.0.