ICD-10-CM Code A42

Actinomycosis

Version 2020 Non-Billable Code

Not Valid for Submission

A42 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of actinomycosis. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:A42
Short Description:Actinomycosis
Long Description:Actinomycosis

Consider the following ICD-10 codes with a higher level of specificity:

  • A42.0 - Pulmonary actinomycosis
  • A42.1 - Abdominal actinomycosis
  • A42.2 - Cervicofacial actinomycosis
  • A42.7 - Actinomycotic sepsis
  • A42.8 - Other forms of actinomycosis
  • A42.81 - Actinomycotic meningitis
  • A42.82 - Actinomycotic encephalitis
  • A42.89 - Other forms of actinomycosis
  • A42.9 - ... unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code A42:

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Clinical Information

  • ACTINOMYCOSIS-. infections with bacteria of the genus actinomyces.
  • ACTINOMYCOSIS CERVICOFACIAL-. a form of actinomycosis characterized by slow growing inflammatory lesions of the lymph nodes that drain the mouth lumpy jaw reddening of the overlying skin and intraperitoneal abscesses.

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Other bacterial diseases (A30-A49)
      • Actinomycosis (A42)

Code History

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

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.


[Learn More]