Rickettsioses (A75-A79)
chapter 1: Certain Infectious and Parasitic Diseases
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
All codes under A75-A79
A75-A79 can't be used on a claim. Pick a billable code below; grey headings group them.
- A75Typhus fever
- A75.0Epidemic louse-borne typhus fever due to Rickettsia prowazekii
- A75.1Recrudescent typhus [Brill's disease]
- A75.2Typhus fever due to Rickettsia typhi
- A75.3Typhus fever due to Rickettsia tsutsugamushi
- A75.9Typhus fever, unspecified
- A77Spotted fever [tick-borne rickettsioses]
- A77.0Spotted fever due to Rickettsia rickettsii
- A77.1Spotted fever due to Rickettsia conorii
- A77.2Spotted fever due to Rickettsia siberica
- A77.3Spotted fever due to Rickettsia australis
- A77.4Ehrlichiosis
- A77.40Ehrlichiosis, unspecified
- A77.41Ehrlichiosis chaffeensis [E. chaffeensis]
- A77.49Other ehrlichiosis
- A77.8Other spotted fevers
- A77.9Spotted fever, unspecified
- A78Q fever
- A79Other rickettsioses
- A79.0Trench fever
- A79.1Rickettsialpox due to Rickettsia akari
- A79.8Other specified rickettsioses
- A79.81Rickettsiosis due to Ehrlichia sennetsu
- A79.82Anaplasmosis [A. phagocytophilum]
- A79.89Other specified rickettsioses
- A79.9Rickettsiosis, unspecified
A75-A79 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Bacterial Infections
Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.
Read more about bacterial infections on MedlinePlus