ICD10BillableValid for clinical use
ICD-10 Code B35.9: Dermatophytosis, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).
When is it used?
- May be used when a clinician documents dermatophytosis, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
1Certain infectious and parasitic diseases (A00-B99)
block
B35-B49Mycoses
category
B35Dermatophytosis
currentB35
Official coding notes
Inclusion terms
- Ringworm NOS
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Infectious Disease SpecialistGeneral Physician
Related codes
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 266152000high
Deep seated dermatophytosis
Source: SNOMED International ICD-10 map
SNOMED_CT 47382004high
Dermatophytosis
Source: SNOMED International ICD-10 map
SNOMED_CT 840462006high
Dermatophytosis caused by Microsporum praecox
Source: SNOMED International ICD-10 map
SNOMED_CT 713734009high
Dermatophytosis co-occurrent with human immunodeficiency virus infection
Source: SNOMED International ICD-10 map
SNOMED_CT 78854006high
Favus caused by Trichophyton schoenleinii
Source: SNOMED International ICD-10 map
SNOMED_CT 65883009high
Infection by Microspora
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
B35.9
Common synonyms
Dermatophytosis, unspecifiedDermatophytosis
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.