ICD-10 Guide

Abscess

ICD-10 Coding for Abscess(L02.211, K65.1)

PRIMARY SPECIALTYEmergency Medicine

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Abscess?

An abscess is a localized collection of pus that can occur in any tissue of the body, often resulting from infection. Key clinical points include: 1) Abscesses can be caused by bacterial infections, foreign bodies, or other inflammatory processes. 2) Common symptoms include localized pain, swelling, redness, and warmth. 3) Abscesses may require drainage for resolution. 4) They can occur in various anatomical locations, including the skin, lungs, and abdomen. 5) Clinical presentation often includes fever and systemic signs of infection. The pathophysiology involves the body's immune response to infection, leading to the accumulation of neutrophils and necrotic tissue. Typical use cases for this diagnosis code include emergency department visits for skin abscesses, intra-abdominal abscesses detected via imaging, and abscesses requiring surgical intervention.

Key Clinical Considerations:

Diagnosis of an abscess requires clinical evidence of localized swelling, tenderness, and fluctuation upon examination.
Signs and symptoms include pain at the site, erythema, warmth, and systemic symptoms such as fever.
Resolution criteria include the absence of pain, reduction in swelling, and normalization of systemic symptoms post-drainage or treatment.
Laboratory findings may include elevated white blood cell count and imaging studies (e.g., ultrasound, CT scan) showing fluid collection.

Clinical Information

Clinical Criteria & Documentation Requirements

Essential documentation includes a detailed description of the abscess location, size, and associated symptoms.
Compliant documentation example: 'Patient presents with a 3 cm fluctuant abscess on the left forearm.' Non-compliant example: 'Patient has an infection.'
Documentation template phrases include: 'Abscess located at [site] with [size] and [symptoms].'
Medical necessity documentation must justify the need for drainage or surgical intervention based on clinical findings.

Coding Guidelines

Usage Guidelines & Examples

Use L02.211 for a cutaneous abscess of the right upper limb, while K65.1 is for peritoneal abscess. Avoid using L02.211 for non-infectious lesions.
Do not use this code for conditions like cellulitis without abscess formation.
Correct usage example: 'Patient diagnosed with a right thigh abscess (L02.211).' Incorrect usage: 'Patient has cellulitis (L03.90) without abscess.'
Common errors include misclassifying abscesses as cellulitis; ensure documentation specifies abscess presence.

Code Exclusions

Important Exclusions

Excluded conditions include cellulitis without abscess (L03.90) and other skin infections without pus formation.
Alternative codes for exclusions include L03.90 for cellulitis and L04.9 for unspecified abscess.
Common exclusion errors involve coding an abscess when only cellulitis is present; ensure documentation supports abscess diagnosis.
Certain conditions are excluded to maintain specificity in coding and ensure appropriate treatment pathways.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

This diagnosis applies to skin abscesses, intra-abdominal abscesses, and abscesses in other anatomical locations.
Clinical scenarios include emergency presentations of abscesses requiring drainage or surgical intervention.
Applicable in both inpatient and outpatient settings, particularly in emergency medicine.
Specialty-specific considerations include surgical intervention protocols in general surgery.

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: 'Abscess diagnosed based on clinical findings of [size] and [symptoms].'

Template 2

Template: 'Patient presents with [symptoms] consistent with abscess at [location].'

Template 3

Template: 'Diagnostic criteria met: [specific findings] indicating abscess.'

Template 4

Template: 'Treatment plan includes incision and drainage for abscess at [location].'

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 must include abscess location, size, symptoms, and treatment plan.

When should this code be used vs similar codes?

Use L02.211 for abscesses; use L03.90 for cellulitis without abscess.

What are common billing issues with this code?

Reimbursement issues may arise from lack of documentation supporting the need for drainage.

What procedures are commonly associated?

Related CPT codes include 10060 for incision and drainage of abscess.

What is Abscess?

Key Clinical Considerations:

Diagnosis of an abscess requires clinical evidence of localized swelling, tenderness, and fluctuation upon examination.
Signs and symptoms include pain at the site, erythema, warmth, and systemic symptoms such as fever.
Resolution criteria include the absence of pain, reduction in swelling, and normalization of systemic symptoms post-drainage or treatment.
Laboratory findings may include elevated white blood cell count and imaging studies (e.g., ultrasound, CT scan) showing fluid collection.

Abscess

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?

Abscess

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?