2021 ICD-10-CM Code B27.8

Other infectious mononucleosis

Version 2021

Not Valid for Submission

B27.8 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 infectious mononucleosis. 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:B27.8
Short Description:Other infectious mononucleosis
Long Description:Other infectious mononucleosis

Code Classification

Specific Coding for Other infectious mononucleosis

Non-specific codes like B27.8 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 infectious mononucleosis:

  • BILLABLE CODE - Use B27.80 for Other infectious mononucleosis without complication
  • BILLABLE CODE - Use B27.81 for Other infectious mononucleosis with polyneuropathy
  • BILLABLE CODE - Use B27.82 for Other infectious mononucleosis with meningitis
  • BILLABLE CODE - Use B27.89 for Other infectious mononucleosis with other complication

Clinical Information

Information for Patients


Infectious Mononucleosis

Also called: Glandular fever, Kissing disease, Mono, Mononucleosis

Infectious mononucleosis, or "mono", is an infection usually caused by the Epstein-Barr virus. The virus spreads through saliva, which is why it's sometimes called "kissing disease." Mono occurs most often in teens and young adults. However, you can get it at any age. Symptoms of mono include

Sometimes you may also have a swollen spleen. Serious problems are rare.

A blood test can show if you have mono. Most people get better in two to four weeks. However, you may feel tired for a few months afterward. Treatment focuses on helping symptoms and includes medicines for pain and fever, warm salt water gargles and plenty of rest and fluids.


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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)