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v1.0.0
ICD-10 Guide
ICD-10 CodesB47.9

B47.9

Mycosis, unspecified

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

Code Description

ICD-10 B47.9 is a billable code used to indicate a diagnosis of mycosis, unspecified.

Key Diagnostic Point:

Mycosis refers to a fungal infection that can affect various parts of the body, including the skin, nails, and internal organs. The term 'unspecified' indicates that the specific type of fungal infection has not been clearly identified or documented. Fungal infections can range from superficial infections, such as athlete's foot and ringworm, to more serious systemic infections that can affect immunocompromised patients. Common fungi responsible for infections include Candida species, Aspergillus species, and dermatophytes. Symptoms may vary widely depending on the site of infection and the patient's immune status. In immunocompromised patients, such as those with HIV/AIDS, cancer, or those on immunosuppressive therapy, fungal infections can be particularly severe and may require aggressive antifungal treatment. Antifungal medications, such as azoles (e.g., fluconazole), echinocandins (e.g., caspofungin), and polyenes (e.g., amphotericin B), are commonly used to treat these infections. Accurate diagnosis and treatment are crucial, as untreated fungal infections can lead to significant morbidity and mortality.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of fungal pathogens that can cause mycosis
  • Differentiation between superficial and systemic infections
  • Need for detailed patient history to identify underlying conditions
  • Variability in treatment protocols based on patient immunocompetence

Audit Risk Factors

  • Insufficient documentation of the specific fungal infection
  • Lack of clarity on the patient's immunocompromised status
  • Inconsistent use of antifungal treatment protocols
  • Failure to document the clinical rationale for using B47.9

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, including immunocompromised status and specific symptoms.

Common Clinical Scenarios

Patients presenting with fever, rash, or respiratory symptoms with a known history of fungal exposure.

Billing Considerations

Documentation must clearly indicate the suspected fungal pathogen and any diagnostic tests performed.

Dermatology

Documentation Requirements

Photographic evidence of skin lesions and detailed descriptions of the lesions.

Common Clinical Scenarios

Patients with skin lesions suspected to be fungal in nature but not yet confirmed.

Billing Considerations

Ensure that the documentation specifies the location and characteristics of the lesions.

Coding Guidelines

Inclusion Criteria

Use B47.9 When
  • According to ICD
  • 10 coding guidelines, B47
  • 9 should be used when the specific type of mycosis is not documented
  • Coders should ensure that all relevant clinical information is captured to support the use of this code
  • It is important to follow the guidelines for specificity and to avoid using unspecified codes when a more specific diagnosis is available

Exclusion Criteria

Do NOT use B47.9 When
No specific exclusions found.

Related CPT Codes

87102CPT Code

Culture, fungal

Clinical Scenario

Used when a fungal culture is performed to identify the specific pathogen.

Documentation Requirements

Document the reason for the culture and any relevant clinical findings.

Specialty Considerations

Infectious disease specialists may require additional lab results to support the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for greater specificity in coding fungal infections. However, the use of unspecified codes like B47.9 can lead to challenges in tracking epidemiology and treatment outcomes, emphasizing the need for accurate documentation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding fungal infections. However, the use of unspecified codes like B47.9 can lead to challenges in tracking epidemiology and treatment outcomes, emphasizing the need for accurate documentation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding fungal infections. However, the use of unspecified codes like B47.9 can lead to challenges in tracking epidemiology and treatment outcomes, emphasizing the need for accurate documentation.

Resources

Clinical References

  • •
    CDC Fungal Diseases

Coding & Billing References

  • •
    CDC Fungal Diseases

Frequently Asked Questions

When should I use B47.9?

Use B47.9 when a patient presents with a fungal infection that has not been specified. Ensure that documentation supports the use of this code and that no more specific fungal infection code is available.