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v1.0.0
ICD-10 Guide
DiagnosesPityriasis Rosea

Pityriasis Rosea

ICD-10 Coding for Pityriasis Rosea(L42)

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

Diagnosis Overview

What is Pityriasis Rosea?
Essential facts and insights about Pityriasis Rosea

Key Clinical Considerations:

  • Herald patch (initial lesion) followed by smaller lesions in a Christmas tree pattern
  • Mild pruritus (itching) in some cases
  • Lesions typically resolve within 6-8 weeks

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including onset and duration of symptoms
  • Description of lesions (size, shape, distribution)
  • Exclusion of other skin conditions (e.g., psoriasis, eczema)

Coding Guidelines

Usage Guidelines & Examples

  • Use B08.1 for primary diagnosis; avoid using codes for similar conditions unless specified.
  • Common errors include misdiagnosing as other dermatitis types.

Code Exclusions

Important Exclusions

  • Excludes conditions like secondary syphilis and drug eruptions.
  • Alternative codes may include B03 for other viral exanthems.

Related ICD-10 Codes

Primary Codes
B08.1
Pityriasis rosea
Ancillary Codes
Z23
Z00.00
Differential Codes
B35.6
L40.1
A51.39

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Dermatology

Specialty Applications

  • Adolescents and young adults are most commonly affected.
  • Can occur in outpatient dermatology 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

Documentation requirements?

Document the appearance, location, and duration of lesions.

Billing considerations?

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