ICD-10 code for typhus infection

The ICD-10-CM code for typhus infection is A75.9 (Typhus fever, unspecified). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A75.9.

Within A75, choose A75.9 (unspecified) only when documentation doesn't support a more specific option: 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 due to Rickettsia tsutsugamushi (A75.3).

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.