2026 ICD-10-CM Diagnosis Code A79Other rickettsioses

ICD-10-CM Codes›A00–B99›A75-A79›A79

ICD-10-CM A79
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A79 is a non-billable ICD-10-CM category code for other rickettsioses, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A79.0, A79.1, A79.81, and A79.82.

Code Identity

ICD-10-CM Code
A79
Billable Status
No — Non-Billable Category
Code Describes
Other rickettsioses
Chapter
A75-A79
Rickettsioses

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA75-A79Rickettsioses
CategoryA79Other rickettsioses
This CodeA79Other rickettsioses

Specific Coding for Other rickettsiosesOverview

Non-specific codes like A79 require more characters. Use one of these billable codes instead:

  • Use A79.0 for Trench fever

  • Use A79.1 for Rickettsialpox due to Rickettsia akari

  • A79.8 for Other specified rickettsioses

  • Use A79.81 for Rickettsiosis due to Ehrlichia sennetsu

  • Use A79.82 for Anaplasmosis [A. phagocytophilum]

  • Use A79.89 for Other specified rickettsioses

  • Use A79.9 for Rickettsiosis, unspecified

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A79Overview

Is A79 (Other rickettsioses) a billable code?

No. This is a category header that groups the codes for other rickettsioses, and headers cannot be submitted on claims. Claims for other rickettsioses need a more specific code from this category, such as A79.0, A79.1, and A79.81.