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v1.0.0
ICD-10 Guide
DiagnosesPorokeratosis

Porokeratosis

ICD-10 Coding for Porokeratosis(L56.5, L85.2, D49.2)

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

Diagnosis Overview

What is Porokeratosis?
Essential facts and insights about Porokeratosis

Key Clinical Considerations:

  • Presence of cornoid lamellae on the skin
  • Histological confirmation showing a column of parakeratosis
  • Lesions typically appear as annular plaques with a raised border

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including onset and duration of lesions
  • Description of lesion characteristics (size, shape, color)
  • Photographic evidence of lesions when applicable

Coding Guidelines

Usage Guidelines & Examples

  • Use L12.9 for unspecified cases and L12.8 for specific types.
  • Common errors include using incorrect codes for similar skin conditions.

Code Exclusions

Important Exclusions

  • Other skin disorders with similar presentations (e.g., psoriasis)
  • Codes for non-dermatological conditions

Related ICD-10 Codes

Primary Codes
L12.9
Porokeratosis, unspecified
L12.8
Other porokeratosis
Ancillary Codes
Z77.22
Differential Codes
L57.0
L56.5

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Dermatology

Specialty Applications

  • Adults and children with skin lesions
  • Dermatology clinics and outpatient 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 the clinical presentation, duration, and any treatments tried.

What are the billing considerations?

Ensure accurate coding based on the specific type of porokeratosis and any associated conditions.