ICD-10-CM Code B27.1

Cytomegaloviral mononucleosis

Version 2020 Non-Billable Code

Not Valid for Submission

B27.1 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of cytomegaloviral mononucleosis. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:B27.1
Short Description:Cytomegaloviral mononucleosis
Long Description:Cytomegaloviral mononucleosis

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

  • B27.10 - Cytomegaloviral mononucleosis without complications
  • B27.11 - Cytomegaloviral mononucleosis with polyneuropathy
  • B27.12 - Cytomegaloviral mononucleosis with meningitis
  • B27.19 - Cytomegaloviral mononucleosis with other complication

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Other viral diseases (B25-B34)
      • Infectious mononucleosis (B27)

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 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

  • Fever
  • Sore throat
  • Swollen lymph glands

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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