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ICD-10 Guide
DiagnosesAlopecia Areata

Alopecia Areata

ICD-10 Coding for Alopecia Areata(L63.9, L63.0, L63.2)

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

Diagnosis Overview

What is Alopecia Areata?
Essential facts and insights about Alopecia Areata

Key Clinical Considerations:

  • Presence of patchy hair loss on the scalp or other areas of the body, often with well-defined borders.
  • Negative pull test indicating that hair follicles are intact.
  • No signs of inflammation or scarring on the scalp.
  • Trichoscopy may reveal yellow dots, exclamation mark hairs, and broken hairs.
  • Severity can be assessed by the extent of hair loss, categorized as mild (less than 50% scalp involvement) or severe (more than 50% scalp involvement).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's history of hair loss, including onset and duration.
  • Use specific terminology such as 'patchy alopecia' or 'totalis' for complete scalp involvement.
  • Examples include: 'Patient presents with patchy hair loss consistent with alopecia areata.'
  • Document medical necessity for treatments such as corticosteroids or immunotherapy.
  • Quality measures may include tracking treatment response and patient-reported outcomes.

Coding Guidelines

Usage Guidelines & Examples

  • Use L63.0 for alopecia areata (localized), L63.2 for alopecia totalis (complete scalp loss), and L63.9 for unspecified alopecia areata.
  • Do not use these codes for hair loss due to other causes such as androgenetic alopecia or telogen effluvium.
  • L63.1 (Alopecia universalis) is related but indicates total body hair loss.
  • Common errors include misclassifying alopecia areata as androgenetic alopecia; ensure clear documentation of the type.
  • In complex cases, consider the patient's history and other dermatological conditions that may affect hair loss.

Code Exclusions

Important Exclusions

  • Exclude codes for hair loss due to chemotherapy (Z51.11) or other medical conditions.
  • Alternative codes for excluded conditions include L65 for other nonscarring hair loss.
  • Conditions are excluded to ensure accurate representation of alopecia areata specifically.
  • Common mistakes include using alopecia areata codes for hair loss due to nutritional deficiencies.
  • Related but distinct conditions include androgenetic alopecia (L65.9) and cicatricial alopecia.

Related ICD-10 Codes

Primary Codes
L63.9
Alopecia areata, unspecified
L63.0
Alopecia areata, localized
L63.2
Alopecia totalis
Ancillary Codes
Z71.3
Differential Codes
L65.0
L63.1

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Dermatology

Specialty Applications

  • Applies to patients with autoimmune conditions, particularly those with a family history of alopecia.
  • Commonly seen in adolescents and young adults, but can occur at any age.
  • Clinical settings include outpatient dermatology clinics and specialty hair loss centers.
  • Specialty-specific applications in dermatology and trichology.
  • Used in treatment contexts involving corticosteroid injections, topical treatments, or systemic therapies.

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 areata based on clinical findings of patchy hair loss.'

Template 2

Template: 'Clinical presentation consistent with alopecia areata including well-defined patches of hair loss.'

Template 3

Template: 'Diagnostic criteria for alopecia areata met as evidenced by negative pull test and trichoscopy findings.'

Template 4

Template: 'Treatment plan initiated for alopecia areata with corticosteroid injections.'

Template 5

Template: 'Follow-up care for alopecia areata including monitoring hair regrowth and treatment response.'

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 clinical presentation, history of hair loss, and any diagnostic tests performed.

How does this differ from similar diagnoses?

Alopecia areata is an autoimmune condition, while androgenetic alopecia is genetically determined.

What are common billing considerations?

Ensure that the diagnosis is clearly documented to support the medical necessity of treatments.

What procedures are typically associated?

CPT codes for corticosteroid injections or topical treatments may be relevant.

Are there any quality reporting implications?

Quality measures may include tracking treatment efficacy and patient satisfaction.