ICD-10-CM 2027
ICD-10 code for dermatophytosis
From the official ICD-10-CM alphabetic index entry “Dermatophytosis (epidermophyton) (infection) (Microsporum) (tinea) (Trichophyton)”. Page updated September 29, 2026.
About coding dermatophytosis
The ICD-10-CM code for dermatophytosis is B35.9 (Dermatophytosis, unspecified). The official index lists 14 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B35.9.
Within B35, choose B35.9 (unspecified) only when documentation doesn't support a more specific option: tinea barbae and tinea capitis (B35.0), tinea unguium (B35.1), tinea manuum (B35.2), tinea pedis (B35.3), tinea corporis (B35.4), tinea imbricata (B35.5), tinea cruris (B35.6) and other dermatophytoses (B35.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific dermatophytosis codes (official index)
- beard B35.0 — Tinea barbae and tinea capitis
- body B35.4 — Tinea corporis
- capitis B35.0 — Tinea barbae and tinea capitis
- corporis B35.4 — Tinea corporis
- deep-seated B35.8 — Other dermatophytoses
- disseminated B35.8 — Other dermatophytoses
- foot B35.3 — Tinea pedis
- granulomatous B35.8 — Other dermatophytoses
- groin B35.6 — Tinea cruris
- hand B35.2 — Tinea manuum
- nail B35.1 — Tinea unguium
- perianal (area) B35.6 — Tinea cruris
- scalp B35.0 — Tinea barbae and tinea capitis
- specified NEC B35.8 — Other dermatophytoses
Common questions about dermatophytosis ICD-10 codes
What is the ICD-10 code for dermatophytosis?
- B35.9 — Dermatophytosis, unspecified. More specific codes apply when the documentation supports them: B35.0, B35.4, B35.0, B35.4 and others below.
What is the ICD-10 code for beard dermatophytosis?
- B35.0 — Tinea barbae and tinea capitis.
What is the ICD-10 code for body dermatophytosis?
- B35.4 — Tinea corporis.
What is the ICD-10 code for capitis dermatophytosis?
- B35.0 — Tinea barbae and tinea capitis.
What is the ICD-10 code for corporis dermatophytosis?
- B35.4 — Tinea corporis.
What is the ICD-10 code for deep-seated dermatophytosis?
- B35.8 — Other dermatophytoses.
What is the ICD-10 code for disseminated dermatophytosis?
- B35.8 — Other dermatophytoses.
Is B35.9 billable?
- Yes. B35.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B35.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B35.9 as a principal diagnosis.
Is B35.9 a CC or MCC?
- No. B35.9 is neither a CC nor an MCC under MS-DRG v44.0.