A78 – Q fever
ICD-10-CM 2027 diagnosis code · Rickettsioses
ICD-10-CM code
A78
- Code
A78(claims format:A78)- Description
- Q fever
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A75-A79 Rickettsioses
Notes for A78
Applicable to:
- Infection due to Coxiella burnetii
- Nine Mile fever
- Quadrilateral fever
Index terms for A78
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Q fever
- Fever, Q
- Balkan grippe
- Fever, Nine-Mile
- Australian, Q fever
- Fever, Australian Q
- Quadrilateral fever
- Fever, quadrilateral
- Endocarditis, Q fever
- Pneumonia, in, Q fever
- Grippe, grippal, Balkan
- Q fever, with pneumonia
- Endocarditis, due to, Q fever
- Endocarditis, Coxiella burnetii
- Infection, infected, infective, Q fever
- Infection, infected, infective, Coxiella burnetii
Frequently asked questions
What is ICD-10 code A78?
A78 is the ICD-10-CM code for q fever, in the block A75-A79 (Rickettsioses).
Is A78 a billable code?
Yes. A78 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.