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ICD-10 Coding for Onychomycosis of Toenails(B35.1, B35.9, L40.5)

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Learn about ICD-10 coding for onychomycosis of toenails, including documentation requirements and common coding pitfalls.

Also known as:
Toenail FungusTinea Unguium
Related ICD-10 Code Ranges

Complete code families applicable to Onychomycosis of Toenails

A00-B99Primary Range

Certain infectious and parasitic diseases

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Primary ICD-10-CM Codes
Tinea unguium
B35.1Billable
Differential Codes

Alternative codes to consider when ruling out similar conditions

Psoriatic nail dystrophyL40.5
Nail dystrophyL60.3

Use when nail changes are due to non-fungal causes.

Documentation & Coding Risks

Avoid these common issues when documenting Onychomycosis of Toenails.

Failure to document laterality

Impact

Clinical: May affect treatment decisions., Regulatory: Non-compliance with coding guidelines., Financial: Potential for claim denials.

Mitigation

Always specify which toenail is affected., Include laterality in all documentation.

Using unspecified codes like B35.9

Impact

Reimbursement: May lead to claim denials or reduced reimbursement., Compliance: Increases risk of audit and non-compliance., Data Quality: Decreases accuracy of clinical data.

Mitigation

Use B35.1 with specific test documentation.

Unspecified coding

Impact

Use of unspecified codes like B35.9 increases audit risk.

Mitigation

Always use B35.1 with documented test results.

Frequently Asked Questions

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with B35.1.