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Home/Diagnosis/ICD-10 Coding for Onychomycosis

ICD-10 Coding for Onychomycosis

B35.1

Complete ICD-10-CM coding and documentation guide for icd-10 coding for onychomycosis includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Tinea Unguium
Dermatophytic Onychia
Nail Fungus
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Key Information: ICD-10 Coding for Onychomycosis

Essential facts and insights about ICD-10 Coding for Onychomycosis

Use ICD-10 code B35.1 for dermatophytosis of nail, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Dermatophytosis of nail

Billable Code
B35.1
Billable

Diagnostic Criteria

clinical_criteria:
  • • Presence of septate hyphae in KOH test
coding_criteria:
  • • Use B35.1 only with confirmed lab results
documentation_criteria:
  • • Document specific organism and test results

Applicable To

  • • Onychomycosis due to dermatophytes

Important Notes

  • • Ensure lab confirmation before using B35.1.
Ancillary Codes

Additional codes that may be used with this diagnosis

B35.3

Tinea pedis

Use when athlete’s foot coexists with onychomycosis.

L03.03

Cellulitis of toe

Use when cellulitis is secondary to fungal infection.

Frequently Asked Questions

What is the ICD-10 code for onychomycosis?

The ICD-10 code for onychomycosis is B35.1, used for dermatophytic nail infections confirmed by lab tests.

How is onychomycosis confirmed?

Onychomycosis is confirmed through lab tests such as KOH microscopy, fungal culture, or PCR detecting dermatophyte DNA.

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