ICD-10 Guide

Abnormal Skin Lesion

ICD-10 Coding for Abnormal Skin Lesion(L98.9, E11.628)

PRIMARY SPECIALTYDermatology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Abnormal Skin Lesion?

An abnormal skin lesion refers to any atypical growth or change in the skin's appearance that may indicate underlying pathology. Key clinical points include: 1) Abnormal skin lesions can be benign or malignant, necessitating careful evaluation. 2) Common types include moles, warts, and skin tags, but lesions can also signify skin cancers such as melanoma. 3) Etiology may involve genetic factors, environmental exposure, or viral infections. 4) Clinical presentation varies widely, from asymptomatic lesions to those that are painful or itchy. 5) Typical use cases for this diagnosis code include dermatological assessments, biopsies, and monitoring of existing lesions. The pathophysiology involves alterations in skin cell growth and differentiation, often influenced by UV exposure or genetic predispositions. Clinically, patients may present with changes in color, size, or texture of existing lesions, prompting further investigation and management.

Key Clinical Considerations:

Diagnosis requires a thorough clinical examination and, if necessary, a biopsy to confirm the nature of the lesion.
Signs may include asymmetry, irregular borders, varied color, diameter greater than 6mm, or changes over time.
Resolution criteria include complete regression of the lesion or stabilization without further changes.
Laboratory findings may include histopathological analysis confirming benign or malignant characteristics.

Clinical Information

Clinical Criteria & Documentation Requirements

Documentation must include detailed descriptions of the lesion's size, shape, color, and any changes over time.
Compliant documentation includes clear notes on the lesion's characteristics and any diagnostic tests performed, while non-compliant documentation may lack specificity.
Template phrases include: 'Lesion described as [size, shape, color] with [symptoms] observed.'
Medical necessity documentation should justify the need for evaluation or treatment based on clinical findings.

Coding Guidelines

Usage Guidelines & Examples

Use this code when documenting an abnormal skin lesion that requires monitoring or treatment, such as a suspicious mole.
Do not use this code for benign lesions that do not require further evaluation or for conditions unrelated to skin lesions.
Correct usage example: 'Patient presents with an irregularly shaped mole on the back.' Incorrect usage: 'Patient has a normal mole.'
Common errors include coding for a benign lesion as abnormal; ensure clinical findings support the diagnosis.

Code Exclusions

Important Exclusions

Excluded conditions include benign nevi (moles) that do not require intervention; rationale is based on clinical guidelines.
Alternative codes for exclusions may include D22 for benign neoplasm of skin.
Common exclusion errors involve misclassifying benign lesions as abnormal; ensure clinical context is clear.
Certain conditions are excluded to prevent overcoding and ensure accurate representation of patient status.

Specialty Focus

Primary Specialty

Dermatology

Specialty Applications

This diagnosis applies to patients with atypical skin growths or changes requiring further evaluation.
Appropriate in clinical scenarios such as routine skin checks or when patients report changes in existing lesions.
Applicable in various settings, including outpatient dermatology clinics and inpatient care for skin-related issues.
Specialty-specific considerations include the need for dermatological expertise in assessing lesion characteristics.

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: 'Abnormal skin lesion diagnosed based on clinical findings and biopsy results.'

Template 2

Template: 'Patient presents with an irregularly shaped lesion consistent with potential malignancy.'

Template 3

Template: 'Diagnostic criteria met: lesion exhibits asymmetry and color variation.'

Template 4

Template: 'Treatment plan includes excision of the lesion for further evaluation.'

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 code?

Detailed documentation should include lesion characteristics, patient history, and any diagnostic tests.

When should this code be used vs similar codes?

Use this code for abnormal lesions needing evaluation; use related codes for specific benign conditions.

What are common billing issues with this code?

Reimbursement issues may arise from vague documentation; ensure clarity and specificity in notes.

What procedures are commonly associated?

Related CPT codes may include skin biopsies or excisions, which require medical necessity documentation.

What is Abnormal Skin Lesion?

Key Clinical Considerations:

Diagnosis requires a thorough clinical examination and, if necessary, a biopsy to confirm the nature of the lesion.
Signs may include asymmetry, irregular borders, varied color, diameter greater than 6mm, or changes over time.
Resolution criteria include complete regression of the lesion or stabilization without further changes.
Laboratory findings may include histopathological analysis confirming benign or malignant characteristics.

Abnormal Skin Lesion

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?

Abnormal Skin Lesion

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?