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v1.0.0
ICD-10 Guide
DiagnosesOral Thrush

Oral Thrush

ICD-10 Coding for Oral Thrush(B37.0, B37.9)

PRIMARY SPECIALTYPrimary Care
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Oral Thrush?
Essential facts and insights about Oral Thrush

Key Clinical Considerations:

  • White patches on the tongue and oral mucosa
  • KOH preparation showing yeast forms
  • Erythema and soreness in the oral cavity

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of immunosuppression or diabetes
  • Description of oral lesions and symptoms
  • Assessment of risk factors and treatment plan

Coding Guidelines

Usage Guidelines & Examples

  • Use B37.0 for oral thrush; avoid using codes for other candidiasis types.
  • Common errors include misdiagnosing as other oral lesions.

Code Exclusions

Important Exclusions

  • Esophageal candidiasis (B37.1)
  • Other fungal infections of the mouth

Related ICD-10 Codes

Primary Codes
B37.0
Candidiasis of oral cavity
Ancillary Codes
Z79.3
Differential Codes
B37.81
B37.0
B37.0
when oral involvement is confirmed.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Primary Care

Specialty Applications

  • Immunocompromised patients, infants, and elderly populations
  • Primary care, dental offices, and outpatient clinics

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include patient history, clinical findings, and treatment plan.

Billing considerations?

Ensure accurate coding to reflect the severity and treatment of the condition.