Typhus fever (A75)
ICD-10 codes for typhus fever (A75) are used to classify various forms of typhus caused by different rickettsial bacteria. These codes specify distinct types such as epidemic louse-borne typhus, recrudescent (Brill’s) typhus, murine typhus, scrub typhus, and unspecified typhus infections.
These codes help healthcare providers accurately document conditions like louse-borne typhus (A75.0), also known as typhus group rickettsial disease, caused by Rickettsia prowazekii. The code A75.1 covers Brill-Zinsser disease, a recrudescent form of typhus. Murine typhus (A75.2), caused by Rickettsia typhi, and scrub typhus (A75.3) due to Rickettsia tsutsugamushi (also called infection caused by Orientia) are also specifically identified. When the exact type is unknown, code A75.9 applies to unspecified typhus fever. Using these ICD-10 codes ensures precise classification and supports epidemiological tracking of these parasitic rickettsial diseases.
Instructional Notations
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- rickettsiosis due to Ehrlichia sennetsu A79.81
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
Orientia tsutsugamushi
A gram-negative, rod-shaped to coccoid bacterium. It is the etiologic agent of SCRUB TYPHUS in humans and is transmitted by mites from rodent reservoirs.
Scrub Typhus
An acute infectious disease caused by ORIENTIA TSUTSUGAMUSHI. It is limited to eastern and southeastern Asia, India, northern Australia, and the adjacent islands. Characteristics include the formation of a primary cutaneous lesion at the site of the bite of an infected mite, fever lasting about two weeks, and a maculopapular rash.
