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v1.0.0
ICD-10 Guide
DiagnosesHair Loss

Hair Loss

ICD-10 Coding for Hair Loss(L63.9, L65.9, L64.9)

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

Diagnosis Overview

What is Hair Loss?
Essential facts and insights about Hair Loss

Key Clinical Considerations:

  • Gradual thinning on top of head
  • Circular or patchy bald spots
  • Sudden loosening of hair

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of hair loss duration and pattern
  • Family history of hair loss
  • Physical examination findings including scalp condition

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for differentiating between types of alopecia.
  • Common errors include using unspecified codes when specific types are documented.

Code Exclusions

Important Exclusions

  • Hair loss due to chemotherapy or radiation therapy
  • Other conditions like telogen effluvium or traction alopecia

Related ICD-10 Codes

Primary Codes
L65.9
Alopecia, unspecified
L63.9
Alopecia areata, unspecified
L66.9
Scarring alopecia, unspecified
Ancillary Codes
Z00.00
Differential Codes
L63.1
L66.9
L65.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Dermatology

Specialty Applications

  • Adults and children experiencing hair loss
  • Dermatology clinics and primary care settings

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

What are the documentation requirements?

Document patient history, physical exam findings, and any diagnostic tests performed.

What are the billing considerations?

Ensure accurate coding based on specific type of hair loss and associated conditions.