All ICD10 Codes

A78

Billable
ChapterA00–B99
Rankcategory
Official Description

Q fever

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

Instructional Notes

Includes
  • Infection due to Coxiella burnetii
  • Nine Mile fever
  • Quadrilateral fever

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A75-A79Rickettsioses (A75-A79)
A78Q fever

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A78:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A78. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

16 raw paths
Australian1 unique routes
Q fever→A78
Balkan grippe1 unique routes
Direct index entry→A78
Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)3 unique routes
Coxiella burnetii→A78
due to
Q fever→A78
Q fever→A78
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)4 unique routes
Australian Q→A78
Nine-Mile→A78
Q→A78
quadrilateral→A78
Grippe, grippal1 unique routes
Balkan→A78
Infection, infected, infective (opportunistic)2 unique routes
Coxiella burnetii→A78
Q fever→A78
Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)1 unique routes
in (due to)
Q fever→A78
Q fever2 unique routes
Direct index entry→A78
with pneumonia→A78
Quadrilateral fever1 unique routes
Direct index entry→A78

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 867
Other Infectious and Parasitic Diseases Diagnoses with MCC
DRG 868
Other Infectious and Parasitic Diseases Diagnoses with CC
DRG 869
Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

Cross Reference

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