ICD-10-CM Code Z20

Contact with and (suspected) exposure to communicable diseases

Version 2020 Non-Billable Code

Not Valid for Submission

Z20 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of contact with and (suspected) exposure to communicable diseases. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:Z20
Short Description:Contact w and (suspected) exposure to communicable diseases
Long Description:Contact with and (suspected) exposure to communicable diseases

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

  • Z20.0 - Contact with and (suspected) exposure to intestinal infectious diseases
  • Z20.01 - Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)
  • Z20.09 - Contact with and (suspected) exposure to other intestinal infectious diseases
  • Z20.1 - Contact with and (suspected) exposure to tuberculosis
  • Z20.2 - Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission
  • Z20.3 - Contact with and (suspected) exposure to rabies
  • Z20.4 - Contact with and (suspected) exposure to rubella
  • Z20.5 - Contact with and (suspected) exposure to viral hepatitis
  • Z20.6 - Contact with and (suspected) exposure to human immunodeficiency virus [HIV]
  • Z20.7 - Contact with and (suspected) exposure to pediculosis, acariasis and other infestations
  • Z20.8 - Contact with and (suspected) exposure to other communicable diseases
  • Z20.81 - Contact with and (suspected) exposure to other bacterial communicable diseases
  • Z20.810 - Contact with and (suspected) exposure to anthrax
  • Z20.811 - Contact with and (suspected) exposure to meningococcus
  • Z20.818 - Contact with and (suspected) exposure to other bacterial communicable diseases
  • Z20.82 - Contact with and (suspected) exposure to other viral communicable diseases
  • Z20.820 - Contact with and (suspected) exposure to varicella
  • Z20.821 - Contact with and (suspected) exposure to Zika virus
  • Z20.828 - Contact with and (suspected) exposure to other viral communicable diseases
  • Z20.89 - Contact with and (suspected) exposure to other communicable diseases
  • Z20.9 - Contact with and (suspected) exposure to unspecified communicable disease

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 Z20:

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.
  • carrier of infectious disease Z22
  • diagnosed current infectious or parasitic disease -see Alphabetic Index

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • personal history of infectious and parasitic diseases Z86.1

Code Classification

  • Factors influencing health status and contact with health services (Z00–Z99)
    • Persons with potential health hazards related to communicable diseases (Z20-Z29)
      • Contact w and exposure to communicable diseases (Z20) (suspected)

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


Infectious Diseases

Germs, or microbes, are found everywhere - in the air, soil, and water. There are also germs on your skin and in your body. Many of them are harmless, and some can even be helpful. But some of them can make you sick. Infectious diseases are diseases that are caused by germs.

There are many different ways that you can get an infectious disease:

  • Through direct contact with a person who is sick. This includes kissing, touching, sneezing, coughing, and sexual contact. Pregnant mothers can also pass some germs along to their babies.
  • Through indirect contact, when you touch something that has germs on it. For example, you could get germs if someone who is sick touched a door handle, and then you touch it.
  • Through insect or animal bites
  • Through contaminated food, water, soil, or plants

There are four main kinds of germs:

  • Bacteria - one-celled germs that multiply quickly. They may give off toxins, which are harmful chemicals that can make you sick. Strep throat and urinary tract infections are common bacterial infections.
  • Viruses - tiny capsules that contain genetic material. They invade your cells so that they can multiply. This can kill, damage, or change the cells and make you sick. Viral infections include HIV/AIDS and the common cold.
  • Fungi - primitive plant-like organisms such as mushrooms, mold, mildew, and yeasts. Athlete's foot is a common fungal infection.
  • Parasites - animals or plants that survive by living on or in other living things. Malaria is an infection caused by a parasite.

Infectious diseases can cause many different symptoms. Some are so mild that you may not even notice any symptoms, while others can be life-threatening. There are treatments for some infectious diseases, but for others, such as some viruses, you can only treat your symptoms. You can take steps to prevent many infectious diseases:

  • Get vaccinated
  • Wash your hands often
  • Pay attention to food safety
  • Avoid contact with wild animals
  • Practice safe sex
  • Don't share items such as toothbrushes, combs, and straws

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