A77.3 Spotted fever due to Rickettsia australis

The ICD-10-CM code for Spotted fever due to Rickettsia australis is A77.3 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

A75-A79: Rickettsioses (A75-A79)

Category A77

11 codes (9 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to A77.3:

• Queensland fever
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Queensland (coastal) (tick)
• Typhus (fever) › Queensland tick
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › spotted › due to Rickettsia › australis

Inclusion Terms

• Queensland tick typhus

Official Coding Guidelines

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool