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ICD-10 Guide
DiagnosesAlopecia

Alopecia

ICD-10 Coding for Alopecia(L63.9, L64.9)

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

Diagnosis Overview

What is Alopecia?
Essential facts and insights about Alopecia

Key Clinical Considerations:

  • Presence of hair loss in patches or diffuse thinning, often noted by the patient or during a physical examination.
  • Trichoscopy may reveal specific findings such as yellow dots, exclamation mark hairs, or broken hairs.
  • Physical examination may show areas of hair loss with no inflammation or scarring.
  • Imaging is generally not required for diagnosis but may be used in research settings.
  • Severity can be assessed using the Severity of Alopecia Tool (SALT) or other staging systems.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the onset, duration, and pattern of hair loss.
  • Use specific terminology such as 'alopecia areata', 'androgenetic alopecia', or 'telogen effluvium'.
  • Examples include: 'Patient presents with patchy hair loss consistent with alopecia areata.'
  • Medical necessity must be established, particularly for treatments like corticosteroid injections.
  • Quality measures may include tracking patient-reported outcomes and treatment effectiveness.

Coding Guidelines

Usage Guidelines & Examples

  • Use L63.9 for unspecified alopecia when the type is not clearly defined.
  • Do not use this code for hair loss due to chemotherapy or other external factors; use appropriate codes for those conditions.
  • Compare with L64 (androgenetic alopecia) and L65 (other nonscarring hair loss) for more specific coding.
  • Common errors include using the wrong code for the type of alopecia; ensure the specific type is documented.
  • In complex cases, consider the patient's history and any co-existing conditions that may affect hair loss.

Code Exclusions

Important Exclusions

  • Exclude codes for hair loss due to external factors like chemotherapy (use Z51.11 for chemotherapy follow-up).
  • Alternative codes for excluded conditions include L65 for nonscarring hair loss.
  • Conditions are excluded to ensure accurate representation of alopecia types and their management.
  • Common mistakes include misclassifying hair loss due to systemic diseases as alopecia.
  • Related but distinct conditions include scarring alopecia and hair loss due to infections.

Related ICD-10 Codes

Primary Codes
L63.9
Alopecia, unspecified
L64.9
Androgenetic alopecia, unspecified
Differential Codes
L64.9
L63.9

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Dermatology

Specialty Applications

  • Applies to conditions such as alopecia areata, androgenetic alopecia, and telogen effluvium.
  • Patient populations include adults and children, with varying prevalence based on age and gender.
  • Clinical settings include outpatient dermatology clinics and inpatient settings for severe cases.
  • Specialty-specific applications are primarily in dermatology but may also involve endocrinology.
  • Treatment contexts include medical management, surgical options, and psychological support.

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

Template 1

Template: 'Patient diagnosed with alopecia based on clinical findings of patchy hair loss.'

Template 2

Template: 'Clinical presentation consistent with alopecia areata including patchy hair loss.'

Template 3

Template: 'Diagnostic criteria for alopecia met as evidenced by trichoscopy findings.'

Template 4

Template: 'Treatment plan initiated for alopecia with topical corticosteroids and follow-up in 6 weeks.'

Template 5

Template: 'Follow-up care for alopecia including monitoring hair regrowth and side effects of treatment.'

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 documentation is required for this diagnosis?

Document the type of alopecia, duration, and any treatments attempted.

How does this differ from similar diagnoses?

Alopecia areata is patchy, while androgenetic alopecia is progressive and patterned.

What are common billing considerations?

Ensure medical necessity is documented for treatments like minoxidil or finasteride.

What procedures are typically associated?

CPT codes for scalp biopsy or corticosteroid injections may be relevant.

Are there any quality reporting implications?

Monitor treatment outcomes and patient satisfaction as part of quality measures.