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v1.0.0
ICD-10 Guide
DiagnosesHand Foot Mouth

Hand Foot Mouth

ICD-10 Coding for Hand-Foot-and-Mouth Disease(B08.4, B34.1)

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

Diagnosis Overview

What is Hand Foot Mouth?
Essential facts and insights about Hand-Foot-and-Mouth Disease

Key Clinical Considerations:

  • Fever, sore throat, and painful sores in the mouth
  • Rash on hands and feet, often vesicular
  • Malaise and irritability in young children

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including onset of symptoms
  • Physical examination findings including rash and oral lesions
  • Confirmation of diagnosis through clinical presentation

Coding Guidelines

Usage Guidelines & Examples

  • Use B08.4 for confirmed cases; avoid using codes for similar viral exanthems.
  • Common errors include misdiagnosing as other viral infections.

Code Exclusions

Important Exclusions

  • Other viral exanthems such as chickenpox or measles
  • Alternative codes for similar presentations like herpangina

Related ICD-10 Codes

Primary Codes
B08.4
Hand, foot, and mouth disease
Differential Codes
B34.1
B34.1
if enterovirus is suspected but specific HFMD symptoms are not documented.
B08.4
B08.4
if specific HFMD symptoms are documented.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pediatrics

Specialty Applications

  • Pediatric patients, especially under 5 years old
  • Outpatient pediatric clinics and emergency departments

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 detailed history, physical exam findings, and symptom duration.

Billing considerations?

Ensure accurate coding to avoid denials; check for any state-specific guidelines.