A77.1 Spotted fever due to Rickettsia conorii

The ICD-10-CM code for Spotted fever due to Rickettsia conorii is A77.1 (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 A77.1:

• Marseilles fever
• Kenya fever
• Typhus (fever) › African tick
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Kenya (tick)
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Marseilles
• Disease, diseased › Conor and Bruch's (boutonneuse fever)
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › boutonneuse
• Mediterranean › tick fever

Inclusion Terms

• African tick typhus
• Boutonneuse fever
• India tick typhus
• Kenya tick typhus
• Marseilles fever
• Mediterranean tick fever

U.S. Hospital Utilization

A77.1 appeared in too few sampled U.S. inpatient stays in 2023 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

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
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference A77.1 with the canonical source and edition:

A77.1 — Spotted fever due to Rickettsia conorii. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/A77.1

Canonical URL: https://icd10codingpro.com/codes/A77.1