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ICD-10 Guide
DiagnosesAneurysm

Aneurysm

ICD-10 Coding for Aneurysm(I71.1, I71.4)

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

Diagnosis Overview

What is Aneurysm?
Essential facts and insights about Aneurysm

Key Clinical Considerations:

  • Patients may present with symptoms such as chest pain, back pain, or abdominal pain depending on the location of the aneurysm.
  • Imaging studies such as ultrasound, CT scan, or MRI may reveal the presence of an aneurysm.
  • Physical examination may show a pulsatile mass in the abdomen or a bruit over the affected area.
  • Imaging findings may include dilation of the vessel wall, with measurements indicating the size of the aneurysm.
  • Severity can be assessed based on the size of the aneurysm, with larger aneurysms posing a higher risk of rupture.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the patient's symptoms, imaging results, and clinical findings.
  • Specific terminology such as 'abdominal aortic aneurysm' or 'thoracic aortic aneurysm' must be used.
  • Examples include: 'Patient presents with a 5 cm abdominal aortic aneurysm as confirmed by CT scan.'
  • Documentation must establish medical necessity for imaging and interventions.
  • Quality measures may include documentation of risk factors and follow-up care plans.

Coding Guidelines

Usage Guidelines & Examples

  • Use I71.1 for abdominal aortic aneurysm and I71.4 for thoracic aortic aneurysm.
  • Do not use these codes for conditions like aortic dissection or pseudoaneurysm, as they are distinct entities.
  • Related codes include I72 for other aneurysms, which may be relevant in certain cases.
  • Common errors include misclassifying the type of aneurysm or failing to document size.
  • In complex cases, ensure to differentiate between ruptured and unruptured aneurysms for accurate coding.

Code Exclusions

Important Exclusions

  • Excludes conditions such as aortic dissection (I71.0) and pseudoaneurysm (I72.0).
  • Alternative codes for excluded conditions include I71.0 for unspecified aortic aneurysm.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include coding an aneurysm when a dissection is present.
  • Related but distinct conditions include vascular malformations and arteriovenous fistulas.

Related ICD-10 Codes

Primary Codes
I71.1
Abdominal aortic aneurysm
I71.4
Thoracic aortic aneurysm
Ancillary Codes
I79.0
I77.81
Differential Codes
I71.2
I71.3

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Vascular Surgery

Specialty Applications

  • This applies to patients with diagnosed aortic aneurysms.
  • Higher prevalence in older adults, particularly males with risk factors such as smoking and hypertension.
  • Clinical settings include inpatient surgical interventions and outpatient monitoring.
  • Specialty applications are primarily in vascular surgery and cardiology.
  • Treatment contexts include surgical repair or endovascular stenting.

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 abdominal aortic aneurysm based on CT findings showing a 5 cm dilation.'

Template 2

Template: 'Clinical presentation consistent with thoracic aortic aneurysm including chest pain and imaging confirmation.'

Template 3

Template: 'Diagnostic criteria for aneurysm met as evidenced by ultrasound showing a 4.5 cm abdominal aortic aneurysm.'

Template 4

Template: 'Treatment plan initiated for aneurysm repair with endovascular stenting.'

Template 5

Template: 'Follow-up care for aneurysm includes monitoring size and symptoms every 6 months.'

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?

Documentation must include imaging results, clinical findings, and treatment plans.

How does this differ from similar diagnoses?

Aneurysms are characterized by vessel dilation, while dissections involve vessel wall tearing.

What are common billing considerations?

Ensure that all procedures related to aneurysm repair are documented for reimbursement.

What procedures are typically associated?

Common CPT codes include 34800 for endovascular repair and 35001 for open repair.

Are there any quality reporting implications?

Quality measures may include tracking outcomes of surgical interventions and follow-up care.