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ICD-10 Guide
DiagnosesAngioectasia Colon

Angioectasia Colon

ICD-10 Coding for Angioectasia of Colon(K55.21, K55.20)

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

Diagnosis Overview

What is Angioectasia Colon?
Essential facts and insights about Angioectasia of Colon

Key Clinical Considerations:

  • Patients may present with gastrointestinal bleeding, often manifesting as hematochezia or melena.
  • Laboratory findings may include anemia due to chronic blood loss, with low hemoglobin and hematocrit levels.
  • Physical examination may reveal signs of anemia, such as pallor, and abdominal tenderness.
  • Imaging studies, such as colonoscopy, may show vascular malformations or angioectasias in the colon.
  • Severity can be assessed based on the frequency and volume of bleeding episodes, as well as the patient's overall clinical stability.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the presence of angioectasia, including specific symptoms and findings.
  • Terminology such as 'angioectasia', 'vascular malformation', and 'gastrointestinal bleeding' should be used.
  • Examples include: 'Patient diagnosed with angioectasia of the colon based on colonoscopy findings.'
  • Documentation must support medical necessity for procedures like colonoscopy or treatment interventions.
  • Quality measures may include tracking bleeding episodes and response to treatment.

Coding Guidelines

Usage Guidelines & Examples

  • Use K55.21 for angioectasia of the colon when there is documented bleeding; use K55.20 when there is no bleeding.
  • Do not use this code for other types of gastrointestinal bleeding not related to angioectasia.
  • Similar codes include K55.22 for angioectasia of the small intestine; differentiate based on location.
  • Common errors include misclassifying angioectasia as diverticular disease; ensure accurate documentation.
  • In complex cases, consider the patient's full clinical picture and any co-existing conditions.

Code Exclusions

Important Exclusions

  • Excludes conditions like diverticulitis, colorectal cancer, and inflammatory bowel disease.
  • Alternative codes for excluded conditions include K57 for diverticular disease and C18 for colorectal cancer.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include using angioectasia codes for unrelated gastrointestinal conditions.
  • Related but distinct conditions include arteriovenous malformations and hereditary hemorrhagic telangiectasia.

Related ICD-10 Codes

Primary Codes
K55.21
Angioectasia of colon with bleeding
K55.20
Angioectasia of colon without bleeding
Ancillary Codes
D50.9
Differential Codes
Q27.33
I78.1

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Gastroenterology

Specialty Applications

  • Applies to patients with diagnosed angioectasia of the colon, often in older adults.
  • Patient populations may include those with chronic kidney disease or vascular disorders.
  • Clinical settings include outpatient gastroenterology clinics and inpatient hospital settings.
  • Specialty-specific applications are relevant in gastroenterology and hematology.
  • Treatment contexts include management of gastrointestinal bleeding and anemia.

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 angioectasia of the colon based on colonoscopy findings showing vascular malformations.'

Template 2

Template: 'Clinical presentation consistent with angioectasia including recurrent hematochezia and anemia.'

Template 3

Template: 'Diagnostic criteria for angioectasia met as evidenced by colonoscopy findings of vascular lesions.'

Template 4

Template: 'Treatment plan initiated for angioectasia with endoscopic intervention and monitoring for bleeding.'

Template 5

Template: 'Follow-up care for angioectasia including monitoring hemoglobin levels and gastrointestinal symptoms.'

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, diagnostic findings, and treatment plans is essential.

How does this differ from similar diagnoses?

Angioectasia is characterized by vascular malformations, unlike diverticulosis which involves pouches in the colon.

What are common billing considerations?

Ensure that the diagnosis is clearly linked to the procedures performed to optimize reimbursement.

What procedures are typically associated?

Commonly associated procedures include colonoscopy and endoscopic interventions.

Are there any quality reporting implications?

Quality measures may include tracking bleeding episodes and treatment outcomes.