B04 - Monkeypox

Version 2023
ICD-10:B04
Short Description:Monkeypox
Long Description:Monkeypox
Status: Valid for Submission
Version:ICD-10-CM 2023
Code Classification:
  • Certain infectious and parasitic diseases (A00–B99)
    • Viral infections characterized by skin and mucous membrane lesions (B00-B09)
      • Monkeypox (B04)

B04 is a billable ICD-10 code used to specify a medical diagnosis of monkeypox. The code is valid during the fiscal year 2023 from October 01, 2022 through September 30, 2023 for the submission of HIPAA-covered transactions.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Clinical Information

Index to Diseases and Injuries References

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for this diagnosis code are found in the injuries and diseases index:

Convert to ICD-9 Code

Source ICD-10 CodeTarget ICD-9 Code
B04059.01 - Monkeypox

Patient Education


Monkeypox Virus Infections

What is monkeypox?

Monkeypox is a rare disease caused by infection with the monkeypox virus. The monkeypox virus is in the same family of viruses as the smallpox virus. But monkeypox is less contagious than smallpox. And its disease causes milder symptoms and is usually not fatal.

In the past, most of the people who got monkeypox lived in certain parts of central and western Africa, had traveled there, or had been exposed to infected animals imported from there. During the 2022 outbreak, the disease has been found in people who live in other countries, including the United States.

How does monkeypox spread?

Monkeypox spreads in different ways:

Someone who has monkeypox can spread it from the time their symptoms start until their rash has fully healed, all scabs have fallen off, and a fresh layer of skin has formed. This usually takes 2-4 weeks.

Who is more likely to develop monkeypox?

People who are more likely to develop monkeypox include those who:

What are the symptoms of monkeypox?

The symptoms of monkeypox usually start within 3 weeks from the time you were exposed to the virus. The symptoms may include:

You may have all or only a few symptoms:

How is monkeypox diagnosed?

To find out if you have monkeypox, your provider:

What are the treatments for monkeypox?

There are no treatments specifically for monkeypox, but many people get better on their own.

Since monkeypox and smallpox are similar, antiviral medicines that protect against smallpox may also help treat monkeypox. Antiviral medicines may be recommended for people who are more likely to get severely ill, such as patients who have weakened immune systems.

Can monkeypox be prevented?

There are steps you can take to help prevent monkeypox:

If you are sick with monkeypox it is recommended that you stay home while you are sick, if possible. If you have an active rash or other symptoms, it would be best to stay in a separate room from your family members and pets if you can.

The U.S. government has two vaccines in the U.S. to protect against monkeypox. One was approved for smallpox and monkeypox (JYNNEOS), and the other was approved for smallpox (ACAM2000):

The U. S. Centers for Disease Control and Prevention (CDC) recommends vaccination for people who have been exposed to monkeypox or who are more likely to get monkeypox.

Centers for Disease Control and Prevention


[Learn More in MedlinePlus]

Code History