A78 ICD-10-CM Code: Q fever
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
A78Q fever
ICD-10-CM diagnosis code · United States clinical modification
Where A78 sits
- 1
Chapter 1
Certain infectious and parasitic diseases (A00-B99)
- 2
Section
Rickettsioses (A75-A79)
- 3
Category A78
Q fever
- 4
Code A78
Q fever
Notes for this code
Inclusion terms
- Infection due to Coxiella burnetii
- Nine Mile fever
- Quadrilateral fever
Code first
No “code first” instruction is listed for A78.
Use additional code
No “use additional code” instruction is listed for A78.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for A78.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for A78.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code A78 mean?
A78 is the FY 2027 U.S. ICD-10-CM code for “Q fever.”
Is A78 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, A78 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is A78 located in ICD-10-CM?
A78 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Rickettsioses (A75-A79) (A75–A79), under category A78, Q fever.
What coding notes are listed for A78?
Its listed inclusion terms are Infection due to Coxiella burnetii; Nine Mile fever; Quadrilateral fever. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.