2021 ICD-10-CM Code A79

Other rickettsioses

Version 2021

Not Valid for Submission

A79 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of other rickettsioses. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:A79
Short Description:Other rickettsioses
Long Description:Other rickettsioses

Code Classification

Specific Coding for Other rickettsioses

Non-specific codes like A79 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for other rickettsioses:

  • BILLABLE CODE - Use A79.0 for Trench fever
  • BILLABLE CODE - Use A79.1 for Rickettsialpox due to Rickettsia akari
  • NON-BILLABLE CODE - A79.8 for Other specified rickettsioses
  • BILLABLE CODE - Use A79.81 for Rickettsiosis due to Ehrlichia sennetsu
  • BILLABLE CODE - Use A79.89 for Other specified rickettsioses
  • BILLABLE CODE - Use A79.9 for Rickettsiosis, unspecified

Clinical Information

Information for Patients


Bacterial Infections

Bacteria are living things that have only one cell. Under a microscope, they look like balls, rods, or spirals. They are so small that a line of 1,000 could fit across a pencil eraser. Most bacteria won't hurt you - less than 1 percent of the different types make people sick. Many are helpful. Some bacteria help to digest food, destroy disease-causing cells, and give the body needed vitamins. Bacteria are also used in making healthy foods like yogurt and cheese.

But infectious bacteria can make you ill. They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick. Examples of bacteria that cause infections include Streptococcus, Staphylococcus, and E. coli.

Antibiotics are the usual treatment. When you take antibiotics, follow the directions carefully. Each time you take antibiotics, you increase the chances that bacteria in your body will learn to resist them causing antibiotic resistance. Later, you could get or spread an infection that those antibiotics cannot cure.

NIH: National Institute of Allergy and Infectious Diseases


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Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)