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v1.0.0
ICD-10 Guide
DiagnosesAortic Dilatation

Aortic Dilatation

ICD-10 Coding for Aortic Dilatation(I77.810, I71.21)

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

Diagnosis Overview

What is Aortic Dilatation?
Essential facts and insights about Aortic Dilatation

Key Clinical Considerations:

  • Patients may present with symptoms such as chest pain, shortness of breath, or back pain.
  • Echocardiography may reveal a dilated aorta, with measurements exceeding normal ranges.
  • Physical examination may show a bounding pulse or murmur indicative of aortic regurgitation.
  • CT angiography or MRI can provide detailed imaging of the aorta, confirming dilatation.
  • Severity can be assessed based on the degree of dilation and associated complications such as aortic regurgitation or dissection.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must include a clear diagnosis of aortic dilatation with supporting clinical findings.
  • Terminology such as 'aortic dilation' or 'aortic aneurysm' must be used accurately.
  • Examples include documenting the size of the aorta and any symptoms experienced by the patient.
  • Medical necessity must be established through documentation of symptoms and diagnostic tests performed.
  • Quality measures may include tracking the size of the aorta over time and the patient's response to treatment.

Coding Guidelines

Usage Guidelines & Examples

  • Use I77.810 for aortic dilatation without mention of aortic aneurysm; use I71.21 for aortic aneurysm.
  • Do not use these codes for conditions like aortic stenosis or other structural heart diseases.
  • I77.810 is specific for aortic dilatation, while I71.21 indicates a more severe condition (aneurysm).
  • Common errors include misclassifying aortic dilatation as an aneurysm; ensure correct measurements are documented.
  • In complex cases, consider the patient's entire clinical picture and consult guidelines for accurate code selection.

Code Exclusions

Important Exclusions

  • Excludes conditions such as aortic stenosis and aortic dissection.
  • Alternative codes for excluded conditions include I35.0 for aortic stenosis.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include coding aortic dilatation when aortic dissection is present; ensure accurate diagnosis.
  • Related but distinct conditions include aortic regurgitation and thoracic outlet syndrome.

Related ICD-10 Codes

Primary Codes
I77.810
Aortic dilatation, unspecified
I71.21
Thoracic aortic aneurysm, without rupture
Ancillary Codes
Q87.4
Differential Codes
I71.21
I77.810

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Applies to patients with connective tissue disorders, hypertension, or a family history of aortic disease.
  • Patient populations include adults, particularly those over 50, and individuals with risk factors.
  • Clinical settings include outpatient cardiology clinics, inpatient hospital settings, and emergency departments.
  • Specialty-specific applications are primarily in cardiology and vascular surgery.
  • Used in treatment contexts involving monitoring and management of aortic conditions.

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 dilatation based on echocardiographic findings.'

Template 2

Template: 'Clinical presentation consistent with aortic dilatation including chest pain and imaging results.'

Template 3

Template: 'Diagnostic criteria for aortic dilatation met as evidenced by CT angiography findings.'

Template 4

Template: 'Treatment plan initiated for aortic dilatation with monitoring and follow-up imaging.'

Template 5

Template: 'Follow-up care for aortic dilatation including blood pressure management and imaging.'

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 clinical findings, imaging results, and any symptoms.

How does this differ from similar diagnoses?

Aortic dilatation is a widening of the aorta, while an aneurysm involves a localized bulge.

What are common billing considerations?

Ensure that the diagnosis is supported by clinical evidence to avoid claim denials.

What procedures are typically associated?

CPT codes for echocardiography, CT angiography, and MRI may be relevant.

Are there any quality reporting implications?

Quality measures may include tracking the progression of aortic dilatation and treatment outcomes.