ICD-10 Code B35.1
Tinea unguium, also known as onychomycosis
What is the code B35.1?
ICD-10-CM code B35.1 is used to specify a diagnosis of tinea unguium, also known as onychomycosis. This condition is a fungal infection of the nails, commonly affecting the toenails and sometimes the fingernails.
Detailed description of B35.1
Tinea unguium (onychomycosis) is characterized by a fungal infection that leads to discoloration, thickening, and separation from the nail bed. It is commonly caused by dermatophytes, yeasts, and non-dermatophyte molds. This condition can cause pain and discomfort, and in severe cases, it may lead to secondary bacterial infections.
Symptoms commonly associated with B35.1
- Discoloration of the nail (white, yellow, or brown)
- Thickening of the nail
- Brittleness or crumbling of the nail edges
- Distorted nail shape
- Separation of the nail from the nail bed
- Foul odor
Related and similar ICD-10 codes
- B35.0: Tinea barbae and tinea capitis
- B35.2: Tinea manuum
- B35.3: Tinea pedis
- B35.4: Tinea corporis
- B35.5: Tinea imbricata
- B35.6: Tinea cruris
- B35.8: Other specified dermatophytoses
- **B35.9**: Dermatophytosis, unspecified
Appropriate usage of B35.1 for billing
When billing for tinea unguium using ICD-10 code B35.1, ensure that the provider has documented this diagnosis in the patient's medical record and the assessment portion of the note.
Instructional guidelines for coding B35.1
- Inclusion terms for B35.1 are: dermatophytic onychia, dermatophytosis of nail, onychomycosis and ringworm of nails. These terms are the conditions for which this code is to be used.
- Category B35, dermatophytosis, which includes B35.1, has an includes note for favus infections due to species of epidermophyton, micro-sporum, and trichophyton
- Tinea, any type except those in B36.-. This note further defines, and gives examples of, the content of the category. If the diagnosis is documented as suspected but not confirmed by the provider, use appropriate signs and symptoms codes rather than B35.1.
Common pitfalls in coding with B35.1
- Incomplete or inaccurate documentation can lead to incorrect coding. Ensure that the clinical notes are comprehensive and precise.
- Regularly review and update coding practices to align with the latest ICD-10 guidelines and ensure accurate billing.
Key resources for B35.1 coding
- ICD-10-CM Official Guidelines for Coding and Reporting: Provides comprehensive rules and guidelines for coding.
- American Academy of Dermatology (AAD): Offers resources and guidelines related to dermatological conditions, including tinea unguium.
- Centers for Medicare & Medicaid Services (CMS): Provides updates on coding and billing practices.
- Clinical documentation improvement (CDI) programs: Enhance the accuracy and completeness of clinical documentation.
Conclusion
ICD-10-CM code B35.1 is used to report a diagnosis of tinea unguium, a common fungal infection affecting the nails. Accurate documentation and understanding of the symptoms, related codes, and appropriate usage are support effective billing and coding practices. By adhering to instructional notes and avoiding common pitfalls, healthcare providers can ensure precise and efficient coding for this condition.
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