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ICD-10 Guide
ICD-10 CodesB27.80

B27.80

Other infectious mononucleosis without complication

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 B27.80 is a billable code used to indicate a diagnosis of other infectious mononucleosis without complication.

Key Diagnostic Point:

Infectious mononucleosis is primarily caused by the Epstein-Barr virus (EBV), but can also be associated with other viral infections such as cytomegalovirus (CMV) and human immunodeficiency virus (HIV). This condition is characterized by fever, sore throat, lymphadenopathy, and fatigue. The diagnosis is typically made through clinical evaluation and confirmed with laboratory tests, including heterophile antibody tests (e.g., Monospot test) and specific serological tests for EBV and CMV. Other viral infections that may present similarly include toxoplasmosis and certain viral hepatitis infections. Treatment is generally supportive, focusing on symptom relief, as antiviral medications are not routinely indicated for EBV-related mononucleosis. However, in cases where CMV is the causative agent, antiviral therapy may be considered. The absence of complications such as splenic rupture or secondary infections is a key aspect of this diagnosis, making it essential for coders to accurately document the clinical scenario and any relevant laboratory findings.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between various viral causes of mononucleosis
  • Need for specific laboratory confirmation of the causative virus
  • Documentation of absence of complications
  • Variability in clinical presentation among patients

Audit Risk Factors

  • Inadequate documentation of laboratory results
  • Failure to specify the absence of complications
  • Misclassification of the causative virus
  • Inconsistent clinical notes regarding symptoms

Specialty Focus

Medical Specialties

Primary Care

Documentation Requirements

Thorough clinical notes detailing symptoms, laboratory results, and follow-up care.

Common Clinical Scenarios

Patients presenting with fatigue, sore throat, and lymphadenopathy.

Billing Considerations

Ensure documentation reflects the absence of complications and any differential diagnoses considered.

Infectious Disease

Documentation Requirements

Detailed serological test results and clinical evaluations.

Common Clinical Scenarios

Patients with atypical presentations or those requiring antiviral therapy.

Billing Considerations

Document any additional viral testing performed and rationale for treatment decisions.

Coding Guidelines

Inclusion Criteria

Use B27.80 When
  • According to ICD
  • 10 guidelines, B27
  • 80 should be used when the diagnosis of infectious mononucleosis is confirmed without complications
  • Coders should ensure that documentation supports the diagnosis and that any laboratory tests are clearly noted

Exclusion Criteria

Do NOT use B27.80 When
No specific exclusions found.

Related CPT Codes

86790CPT Code

EBV serology

Clinical Scenario

When testing for EBV in suspected cases of mononucleosis.

Documentation Requirements

Document the reason for the test and the clinical findings.

Specialty Considerations

Infectious disease specialists may require more detailed serological profiles.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of infectious mononucleosis, enabling better tracking of viral causes and complications. B27.80 provides a clear distinction for cases without complications, improving data accuracy.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of infectious mononucleosis, enabling better tracking of viral causes and complications. B27.80 provides a clear distinction for cases without complications, improving data accuracy.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of infectious mononucleosis, enabling better tracking of viral causes and complications. B27.80 provides a clear distinction for cases without complications, improving data accuracy.

Resources

Clinical References

  • •
    CDC Infectious Mononucleosis Overview

Coding & Billing References

  • •
    CDC Infectious Mononucleosis Overview

Frequently Asked Questions

What are the common causes of infectious mononucleosis?

The most common cause is the Epstein-Barr virus (EBV), but other viruses such as cytomegalovirus (CMV) and HIV can also cause mononucleosis-like symptoms.