ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
DiagnosesAnal Fistula

Anal Fistula

ICD-10 Coding for Anal Fistula(K60.31, K60.32, K60.5)

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

Diagnosis Overview

What is Anal Fistula?
Essential facts and insights about Anal Fistula

Key Clinical Considerations:

  • Presence of a perianal abscess or drainage of pus from the anal region.
  • Symptoms may include pain, swelling, and discharge from the anal area.
  • Physical examination may reveal a fistulous tract or opening near the anus.
  • Imaging studies such as MRI or ultrasound may be used to assess the extent of the fistula.
  • Severity can be classified based on the complexity of the fistula (e.g., intersphincteric, transsphincteric, suprasphincteric).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Complete medical history including previous anal surgeries or abscesses.
  • Specific terminology such as 'anal fistula', 'fistulous tract', and 'perianal abscess' must be documented.
  • Examples include: 'Patient presents with a transsphincteric anal fistula with associated pain and discharge.'
  • Documentation must support the medical necessity for surgical intervention or other treatments.
  • Quality measures may include documentation of symptom severity and treatment outcomes.

Coding Guidelines

Usage Guidelines & Examples

  • Use K60.31 for intersphincteric anal fistula when the tract is confined to the internal anal sphincter.
  • Do not use this code for conditions such as hemorrhoids or anal fissures, which are distinct diagnoses.
  • K60.32 is used for transsphincteric anal fistula, indicating involvement of the external anal sphincter.
  • Common errors include misclassifying the type of fistula; ensure the correct anatomical involvement is documented.
  • In complex cases, consider the patient's surgical history and the specific type of fistula when selecting codes.

Code Exclusions

Important Exclusions

  • Excludes conditions such as hemorrhoids (K64) and anal fissures (K60.0).
  • Alternative codes for excluded conditions include K64.9 for unspecified hemorrhoids.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include coding an anal fistula when the primary issue is a hemorrhoid.
  • Related but distinct conditions include perianal abscess and rectovaginal fistula.

Related ICD-10 Codes

Primary Codes
K60.31
Intersphincteric anal fistula
K60.32
Transsphincteric anal fistula
K60.5
Other specified anal fistula
Ancillary Codes
K61.1
Differential Codes
K60.32
K60.31

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Colorectal Surgery

Specialty Applications

  • Patients with a history of anal abscesses or inflammatory bowel disease.
  • Common in adults but can occur in children; risk factors include prior anal surgery.
  • Clinical settings include outpatient colorectal surgery clinics and inpatient surgical units.
  • Specialty-specific applications are primarily in colorectal surgery and gastroenterology.
  • Treatment contexts include surgical repair of the fistula and management of associated infections.

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: 'Patient diagnosed with anal fistula based on clinical findings of pain and discharge.'

Template 2

Template: 'Clinical presentation consistent with transsphincteric anal fistula including swelling and drainage.'

Template 3

Template: 'Diagnostic criteria met as evidenced by MRI showing fistulous tract.'

Template 4

Template: 'Treatment plan initiated for anal fistula with surgical intervention scheduled.'

Template 5

Template: 'Follow-up care for anal fistula including monitoring for infection and healing.'

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 diagnosis?

Detailed documentation of symptoms, physical exam findings, and imaging results.

How does this differ from similar diagnoses?

Anal fistulas involve a tract, while hemorrhoids are vascular structures and fissures are tears.

What are common billing considerations?

Ensure that the documentation supports the medical necessity for surgical intervention.

What procedures are typically associated?

Common CPT codes include 46020 for incision and drainage of an anal abscess.

Are there any quality reporting implications?

Quality measures may include tracking postoperative complications and symptom resolution.