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  4. A75-A79
  5. Other rickettsioses (A79)

Other rickettsioses (A79)

The ICD-10 code section A79 covers various types of rickettsial infections that are distinct from more common rickettsioses. These codes are used to classify less frequent rickettsial diseases such as trench fever, rickettsialpox, and other specified or unspecified rickettsial conditions.

This section includes A79.0 for trench fever, a condition historically linked to lice and characterized by recurring fever. The code A79.1 captures rickettsialpox, caused by Rickettsia akari. Other codes like A79.81 and A79.82 identify specific infections such as Sennetsu fever (also known as Neorickettsiosis) and anaplasmosis due to Anaplasma phagocytophilum. The A79.89 category covers various rarer rickettsial infections, including salmon poisoning disease and bartonellosis, while A79.9 is used when the exact rickettsiosis is not specified. These ICD-10 codes help medical coders accurately report these less common bacterial diseases which are often referred to by their synonyms in clinical practice.

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.

Anaplasma

A genus of gram-negative bacteria whose organisms are obligate parasites of vertebrates. Species are transmitted by arthropod vectors with the host range limited to ruminants. Anaplasma marginale is the most pathogenic species and is the causative agent of severe bovine anaplasmosis.

Anaplasmosis

A disease usually in cattle caused by parasitization of the red blood cells by bacteria of the genus ANAPLASMA.

Bartonella quintana

A species of gram-negative bacteria in which man is the primary host and the human body louse, Pediculus humanus, the principal vector. It is the etiological agent of TRENCH FEVER.

Trench Fever

An intermittent fever characterized by intervals of chills, fever, and splenomegaly each of which may last as long as 40 hours. It is caused by BARTONELLA QUINTANA and transmitted by the human louse.