Q fever
In Rickettsioses (A75-A79), chapter 1: Certain Infectious and Parasitic Diseases
- A78 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under A75-A79 below.
- As a secondary diagnosis it is a CC (complication or comorbidity), which can raise the MS-DRG payment. It doesn't count when the principal diagnosis is one of 56 closely related codes.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
Also indexed as: Australian, Q fever; Balkan grippe; Endocarditis, Coxiella burnetii; Endocarditis, due to, Q fever; Endocarditis, Q fever; Fever, Australian Q; Fever, Nine-Mile; Fever, Q; Fever, quadrilateral; Grippe, Balkan; Infection, Coxiella burnetii; Infection, Q fever; Pneumonia, in, Q fever; Q fever; Q fever, with pneumonia; Quadrilateral fever
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Instructional notes
Includes: conditions that are coded here
- Infection due to Coxiella burnetii
- Nine Mile fever
- Quadrilateral fever
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)
Other codes under A75-A79
Rickettsioses (A75-A79)
- A75Typhus fever
- A77Spotted fever [tick-borne rickettsioses]
- A78Q fever(this code)
- A79Other rickettsioses
A78 MS-DRGs
As the principal diagnosis, A78 groups to MS-DRG 867, 868, or 869 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
A78 is in Bacterial infections (INF003, its default category), with 398 codes. Others in it:
Medicare coverage articles listing A78
These 3 Medicare billing and coding articles list A78 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
Other codes that refer to A78
Notes on these codes point to A78.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Animal Diseases and Your Health
Animal diseases that people can catch are called zoonoses. Many diseases affecting humans can be traced to animals or animal products. You can get a disease directly from an animal, or indirectly, through the environment.
Read more about animal diseases and your health on MedlinePlusBacterial 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 MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 083.0 Q fever