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ICD-10 Guide
DiagnosesAortic Aneurysm

Aortic Aneurysm

ICD-10 Coding for Aortic Aneurysm(I71.1, I71.3)

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

Diagnosis Overview

What is Aortic Aneurysm?
Essential facts and insights about Aortic 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 aortic aneurysm.
  • Physical examination may show a pulsatile mass in the abdomen or a bruit over the aorta.
  • Imaging findings may include dilation of the aorta greater than 3 cm for abdominal aortic aneurysms or 4 cm for thoracic aortic aneurysms.
  • Severity can be assessed based on the size of the aneurysm and the presence of complications such as rupture or dissection.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the patient's symptoms, imaging results, and clinical findings that support the diagnosis.
  • Specific terminology such as 'abdominal aortic aneurysm' or 'thoracic aortic aneurysm' must be used.
  • Examples include noting the size and location of the aneurysm and any associated symptoms.
  • Documentation must demonstrate medical necessity for imaging and treatment interventions.
  • Quality measures may include tracking the size of the aneurysm over time and adherence to follow-up protocols.

Coding Guidelines

Usage Guidelines & Examples

  • Use I71.1 for abdominal aortic aneurysm and I71.3 for thoracic aortic aneurysm based on the location.
  • Do not use these codes for aortic dissection or other vascular conditions that do not involve aneurysm.
  • Related codes include I72.0 for aortic aneurysm of unspecified site and I71.9 for unspecified aortic aneurysm.
  • Common errors include misclassifying the type of aneurysm or failing to document the size.
  • In complex cases, ensure to specify the type and location of the aneurysm to select the correct code.

Code Exclusions

Important Exclusions

  • Excludes conditions such as aortic dissection (I71.0) and aortic rupture.
  • Alternative codes for excluded conditions include I71.0 for dissection and I72 for other aneurysms.
  • Conditions are excluded because they represent different pathologies requiring different management.
  • Common mistakes include coding an aneurysm when the patient has a dissection or rupture.
  • Related but distinct conditions include pseudoaneurysms and vascular malformations.

Related ICD-10 Codes

Primary Codes
I71.1
Abdominal aortic aneurysm
I71.3
Thoracic aortic aneurysm
Ancillary Codes
I70.1
A52.01
Differential Codes
I71.0
I71.4
I71.4
if there is no evidence of rupture.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Vascular Surgery

Specialty Applications

  • This applies to patients diagnosed with aortic aneurysms, particularly those at risk due to age or family history.
  • Patient populations include older adults, particularly males over 65, and those with risk factors such as smoking.
  • Clinical settings include both inpatient and outpatient settings, especially vascular surgery clinics.
  • Specialty-specific applications are relevant in vascular surgery and cardiology.
  • Treatment contexts include surgical repair or monitoring of aneurysm size.

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 aortic aneurysm based on imaging findings of dilation.'

Template 2

Template: 'Clinical presentation consistent with abdominal aortic aneurysm including back pain and pulsatile mass.'

Template 3

Template: 'Diagnostic criteria met as evidenced by CT scan showing a 5 cm abdominal aortic aneurysm.'

Template 4

Template: 'Treatment plan initiated for thoracic aortic aneurysm with surgical intervention scheduled.'

Template 5

Template: 'Follow-up care for abdominal aortic aneurysm including monitoring of size and 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?

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

How does this differ from similar diagnoses?

Aortic aneurysms are characterized by dilation, while dissections involve a tear in the vessel wall.

What are common billing considerations?

Ensure that the diagnosis is clearly linked to the medical necessity of imaging and treatment.

What procedures are typically associated?

Common procedures include ultrasound, CT angiography, and surgical repair.

Are there any quality reporting implications?

Quality measures may include tracking aneurysm size and follow-up imaging protocols.