ICD-10-CM 2027
ICD-10 code for tsutsugamushi
From the official ICD-10-CM alphabetic index entry “Tsutsugamushi (disease) (fever)”. Page updated September 29, 2026.
About coding tsutsugamushi
The ICD-10-CM code for tsutsugamushi is A75.3 (Typhus fever due to Rickettsia tsutsugamushi).
Within A75 (typhus fever), A75.3 is specifically for typhus fever due to Rickettsia tsutsugamushi. Related codes cover epidemic louse-borne typhus fever due to Rickettsia prowazekii (A75.0), Recrudescent typhus [Brill's disease] (A75.1), due to Rickettsia typhi (A75.2) and unspecified (A75.9).
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 tsutsugamushi ICD-10 codes
What is the ICD-10 code for tsutsugamushi?
- A75.3 — Typhus fever due to Rickettsia tsutsugamushi.
Is A75.3 billable?
- Yes. A75.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A75.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A75.3 as a principal diagnosis.
Is A75.3 a CC or MCC?
- A75.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.