ICD-10 B35.1
Billable / SpecificTinea unguium
About ICD-10-CM B35.1
ICD-10-CM code B35.1 represents Tinea unguium. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block B35). The 2026 edition of ICD-10-CM B35.1 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under B35.1. Per CMS ICD-10-CM Tabular 2026.
- Dermatophytic onychia
- Dermatophytosis of nail
- Onychomycosis
- Ringworm of nails
Medicare LCD Coverage for B35.1
Local Coverage Determinations (LCDs) from CMS MACs that list B35.1 as a covered diagnosis.
Showing top 10 of 595 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing B35.1.
1 Aetna
5 Medicare
CPT Codes Commonly Billed with B35.1
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 11721 Debridement nails 6+ — ingrown nail, onycholysis, onychogryphosis, nail disorder, onychomycosis, diabetic foot, corn/callosity Podiatry
- 11720 Debridement nails 1-5 — same as 11721 Podiatry
- 11730 Nail avulsion — ingrown nail, onychogryphosis, onycholysis, nail disorder, onychomycosis, cellulitis of toe Podiatry
- 11719 CMS LCD: Billing and Coding: Routine Foot Care and Debridement of Nails CMS LCD
- G0127 CMS LCD: Billing and Coding: Routine Foot Care and Debridement of Nails CMS LCD
- 11056 CMS LCD: Billing and Coding: Routine Foot Care and Debridement of Nails CMS LCD
- 11732 CMS LCD: Billing and Coding: Surgical Treatment of Nails CMS LCD
- 11765 CMS LCD: Billing and Coding: Surgical Treatment of Nails CMS LCD
- 11750 CMS LCD: Billing and Coding: Surgical Treatment of Nails CMS LCD
Convert B35.1 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| B35.1 | 1101 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To B35.1
Other codes in section B35-B49 (Mycoses).
ICD-10 B35.1, Billing FAQ
Is ICD-10 code B35.1 billable? +
Yes, B35.1 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to B35.1? +
ICD-10 B35.1 includes: Dermatophytic onychia; Dermatophytosis of nail; Onychomycosis, and 1 more clinical synonyms.
What CPT codes are commonly billed with B35.1? +
Procedures frequently paired with B35.1 include: 11721, 11720, 11730, 11719, G0127.
What ICD-9 codes does B35.1 map to? +
Per CMS GEMs, B35.1 maps to ICD-9 codes: 1101. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 18, 2026.
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