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ICD-10 Guide
ICD-10 CodesB40.2

B40.2

Candidiasis of skin and nail

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

Code Description

ICD-10 B40.2 is a billable code used to indicate a diagnosis of candidiasis of skin and nail.

Key Diagnostic Point:

Candidiasis of the skin and nails is a fungal infection caused by Candida species, most commonly Candida albicans. This condition typically manifests as red, itchy, and inflamed skin, often accompanied by scaling and peeling. In the case of nail involvement, it can lead to discoloration, thickening, and separation of the nail from the nail bed. Candidiasis is more prevalent in individuals with compromised immune systems, such as those with diabetes, HIV/AIDS, or undergoing immunosuppressive therapy. The infection can occur in warm, moist areas of the body, including the groin, armpits, and between the toes. Diagnosis is primarily clinical, supported by laboratory tests such as KOH preparations or cultures. Treatment typically involves topical antifungal agents like clotrimazole or miconazole for skin infections, while systemic antifungals like fluconazole may be necessary for more severe cases or nail involvement. Proper management is crucial to prevent recurrence, especially in immunocompromised patients.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between candidiasis and other skin infections.
  • Identifying the specific site of infection (skin vs. nails).
  • Documenting the patient's immunocompromised status accurately.
  • Understanding the various antifungal treatments and their indications.

Audit Risk Factors

  • Inadequate documentation of the patient's immunocompromised status.
  • Failure to specify the site of infection (skin vs. nail).
  • Incorrect coding of the severity of the infection.
  • Lack of supporting lab results for diagnosis.

Specialty Focus

Medical Specialties

Dermatology

Documentation Requirements

Detailed description of lesions, location, and treatment response.

Common Clinical Scenarios

Patients presenting with itchy rashes or nail dystrophy.

Billing Considerations

Consideration of underlying conditions that may predispose to candidiasis.

Infectious Disease

Documentation Requirements

Comprehensive history of immunocompromised status and previous infections.

Common Clinical Scenarios

Patients with recurrent infections or those on immunosuppressive therapy.

Billing Considerations

Need for thorough evaluation of potential systemic involvement.

Coding Guidelines

Inclusion Criteria

Use B40.2 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the infection site and any underlying conditions
  • Include any relevant lab results to support the diagnosis

Exclusion Criteria

Do NOT use B40.2 When
No specific exclusions found.

Related CPT Codes

11720CPT Code

Debridement of nail

Clinical Scenario

Used when treating severe nail candidiasis.

Documentation Requirements

Document the extent of debridement and reason for procedure.

Specialty Considerations

Dermatology may require additional notes on nail health.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of candidiasis, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of candidiasis, improving the accuracy of data collection and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    CDC - Fungal Diseases

Coding & Billing References

  • •
    CDC - Fungal Diseases

Frequently Asked Questions

What are the common symptoms of candidiasis of the skin and nails?

Common symptoms include redness, itching, scaling, and in the case of nails, discoloration and separation from the nail bed.