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v1.0.0
ICD-10 Guide
DiagnosesPerianal Abscess

Perianal Abscess

ICD-10 Coding for Perianal Abscess(K61.0, K61.1)

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

Diagnosis Overview

What is Perianal Abscess?
Essential facts and insights about Perianal Abscess

Key Clinical Considerations:

  • Localized pain and swelling in the perianal region
  • Fever and malaise may be present
  • Pus or drainage may be observed upon examination

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including onset and duration of symptoms
  • Description of physical exam findings including tenderness and fluctuation
  • Note any prior treatments or interventions

Coding Guidelines

Usage Guidelines & Examples

  • Follow ICD-10 guidelines for specificity in coding perianal abscess.
  • Common errors include using incorrect codes for abscess types or failing to document associated symptoms.

Code Exclusions

Important Exclusions

  • Fistula-in-ano (K61.1) and other anal conditions
  • Alternative codes for abscesses in other locations

Related ICD-10 Codes

Primary Codes
K61.0
Perianal abscess
Ancillary Codes
B95-B96
Differential Codes
K61.1
K61.1
for deep abscess extending into ischiorectal fossa.
K61.0
K61.0
for superficial abscess confined to anal margin.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

  • Adults and children presenting with perianal pain and swelling
  • Emergency departments and urgent care 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 patient's symptoms, physical exam findings, and any imaging results.

What are the billing considerations?

Ensure accurate coding to reflect the complexity of the case and any procedures performed.