ICD-10 Code B27.1

Cytomegaloviral mononucleosis

Version 2019 Non-Billable Code
ICD-10: B27.1
Short Description:Cytomegaloviral mononucleosis
Long Description:Cytomegaloviral mononucleosis

Not Valid for Submission

ICD-10 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 2019 for the submission of HIPAA-covered transactions.

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)

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

  • 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.

  • Epstein-Barr virus test (Medical Encyclopedia)
  • Mononucleosis (Medical Encyclopedia)
  • Mononucleosis spot test (Medical Encyclopedia)

[Learn More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.