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ICD-10 Guide
DiagnosesAscending Aortic Aneurysm

Ascending Aortic Aneurysm

ICD-10 Coding for Ascending Aortic Aneurysm(I71.21, I71.11)

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

Diagnosis Overview

What is Ascending Aortic Aneurysm?
Essential facts and insights about Ascending Aortic Aneurysm

Key Clinical Considerations:

  • Patients may present with chest pain, back pain, or shortness of breath.
  • Imaging studies such as echocardiography, CT angiography, or MRI may reveal an aortic dilation greater than 4.0 cm.
  • Physical examination may show a diastolic murmur or signs of aortic regurgitation.
  • Imaging findings may include a localized dilation of the ascending aorta, often described as a fusiform or saccular aneurysm.
  • Severity is often classified based on the size of the aneurysm and the presence of symptoms, with surgical intervention typically indicated for aneurysms >5.5 cm.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's symptoms, duration, and any relevant medical history.
  • Use specific terminology such as 'ascending aortic aneurysm' rather than general terms.
  • Examples include: 'Patient presents with a 5.2 cm ascending aortic aneurysm confirmed by CT scan.'
  • Medical necessity must be established, particularly for imaging and surgical interventions.
  • Quality measures may include documentation of risk factors such as hypertension or connective tissue disorders.

Coding Guidelines

Usage Guidelines & Examples

  • Use I71.21 for a non-ruptured ascending aortic aneurysm and I71.11 for a ruptured one.
  • Do not use these codes for aortic dissection or other types of aneurysms.
  • I71.20 is a related code for unspecified aortic aneurysm; however, it lacks specificity.
  • Common errors include misclassifying the type of aneurysm or failing to document the size.
  • In complex cases, ensure to differentiate between aneurysm types and document all relevant findings.

Code Exclusions

Important Exclusions

  • Excludes aortic dissection (I71.0) and thoracic aortic aneurysm (I71.2) which have different management.
  • Alternative codes for excluded conditions include I71.0 for dissection and I72.0 for ectasia.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include coding an ascending aortic aneurysm when the patient has a dissection.
  • Related but distinct conditions include aortic regurgitation and aortic stenosis.

Related ICD-10 Codes

Primary Codes
I71.21
Non-ruptured ascending aortic aneurysm
I71.11
Ruptured ascending aortic aneurysm
Ancillary Codes
I79.0
Differential Codes
I71.11
I71.11
if there is evidence of rupture, such as hemodynamic instability.
I71.21
I71.21
if there is no evidence of rupture.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patients with connective tissue disorders such as Marfan syndrome or Ehlers-Danlos syndrome.
  • Typically affects older adults, particularly males over 65 with risk factors like hypertension or smoking.
  • Clinical settings include outpatient cardiology clinics, emergency departments, and inpatient surgical units.
  • Specialty applications are primarily in cardiology and vascular surgery.
  • Treatment contexts include monitoring, 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 ascending aortic aneurysm based on imaging findings of 5.2 cm dilation.'

Template 2

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

Template 3

Template: 'Diagnostic criteria met as evidenced by CT scan showing a 5.2 cm ascending aortic aneurysm.'

Template 4

Template: 'Treatment plan initiated for ascending aortic aneurysm with surgical repair scheduled.'

Template 5

Template: 'Follow-up care for ascending aortic aneurysm including monitoring of blood pressure and imaging at 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?

Document clinical findings, imaging results, and any relevant patient history.

How does this differ from similar diagnoses?

Key differences include the location and nature of the aneurysm, such as ruptured vs. non-ruptured.

What are common billing considerations?

Ensure that the diagnosis is clearly linked to the medical necessity for imaging or surgical intervention.

What procedures are typically associated?

Common CPT codes include 33860 for aortic repair and 93306 for echocardiography.

Are there any quality reporting implications?

Quality measures may include tracking outcomes of surgical interventions and monitoring for complications.