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v1.0.0
ICD-10 Guide
ICD-10 CodesB01

B01

Varicella (chickenpox)

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

Code Description

ICD-10 B01 is a billable code used to indicate a diagnosis of varicella (chickenpox).

Key Diagnostic Point:

Varicella, commonly known as chickenpox, is an infectious disease caused by the varicella-zoster virus (VZV), a member of the herpesvirus family. It is characterized by an itchy, blister-like rash, fatigue, fever, and headache. The disease is highly contagious and spreads through respiratory droplets or direct contact with the rash. The incubation period typically ranges from 10 to 21 days, with most individuals developing symptoms around 14 days after exposure. Vaccination against varicella is a key preventive measure, with the varicella vaccine recommended for children, adolescents, and adults who have not had the disease. Complications can arise, particularly in immunocompromised individuals, pregnant women, and newborns, including bacterial infections of the skin, pneumonia, and encephalitis. The disease is generally mild in healthy children but can lead to severe outcomes in vulnerable populations. Accurate coding for varicella is essential for proper treatment and management of the disease, as well as for tracking vaccination efforts and public health initiatives.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between primary varicella and herpes zoster (shingles)
  • Identifying complications that may require additional codes
  • Understanding vaccination history and its impact on coding
  • Recognizing the need for documentation of symptoms and clinical findings

Audit Risk Factors

  • Inadequate documentation of vaccination status
  • Failure to document complications or co-existing conditions
  • Misclassification of varicella as herpes zoster
  • Inconsistent coding practices across different healthcare settings

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Documentation of vaccination history, clinical presentation, and any complications.

Common Clinical Scenarios

Routine check-ups for vaccinated children, management of varicella in unvaccinated children.

Billing Considerations

Consideration of the patient's age and vaccination status is critical for accurate coding.

Infectious Disease

Documentation Requirements

Detailed clinical notes on the patient's history, symptoms, and laboratory results.

Common Clinical Scenarios

Management of varicella in immunocompromised patients or those with severe complications.

Billing Considerations

Documentation must reflect the severity of the disease and any complications for accurate coding.

Coding Guidelines

Inclusion Criteria

Use B01 When
  • According to the ICD
  • CM guidelines, B01 should be used for cases of varicella without complications
  • If complications arise, additional codes may be required to capture the full clinical picture
  • Documentation must support the diagnosis and any associated conditions

Exclusion Criteria

Do NOT use B01 When
No specific exclusions found.

Related Codes

Child Codes

9 codes
B01.0
Herpesviral meningitis
B01.1
Varicella encephalitis
B01.11
Varicella encephalitis and encephalomyelitis
B01.12
Varicella myelitis
B01.2
Herpesviral meningitis
B01.8
Other forms of varicella [chickenpox]
B01.81
Varicella keratitis
B01.89
Other varicella complications
B01.9
Varicella without complication

Related CPT Codes

90710CPT Code

Varicella virus vaccine

Clinical Scenario

Administering the varicella vaccine to a child during a routine visit.

Documentation Requirements

Documentation of vaccine administration and patient consent.

Specialty Considerations

Pediatricians should ensure accurate recording of vaccination history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of varicella, improving the ability to track vaccination rates and complications associated with the disease. This specificity aids in public health reporting and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of varicella, improving the ability to track vaccination rates and complications associated with the disease. This specificity aids in public health reporting and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of varicella, improving the ability to track vaccination rates and complications associated with the disease. This specificity aids in public health reporting and resource allocation.

Resources

Clinical References

  • •
    CDC Varicella (Chickenpox) Information

Coding & Billing References

  • •
    CDC Varicella (Chickenpox) Information

Frequently Asked Questions

What is the difference between varicella and herpes zoster?

Varicella is the primary infection caused by the varicella-zoster virus, resulting in chickenpox, while herpes zoster (shingles) is a reactivation of the virus later in life, often causing a painful rash.