ICD-10-CM 2027
ICD-10 code for Weil's disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › Weil's (leptospiral jaundice of lung)”. Page updated September 29, 2026.
About coding Weil's disease
The ICD-10-CM code for Weil's disease is A27.0 (Leptospirosis icterohemorrhagica).
Within A27 (leptospirosis), A27.0 is specifically for leptospirosis icterohemorrhagica. Related codes cover other forms of leptospirosis (A27.8) and unspecified (A27.9).
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 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), 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 Weil's disease ICD-10 codes
What is the ICD-10 code for Weil's disease?
- A27.0 — Leptospirosis icterohemorrhagica.
Is A27.0 billable?
- Yes. A27.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A27.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A27.0 as a principal diagnosis.
Is A27.0 a CC or MCC?
- A27.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.