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ICD-10 Guide
DiagnosesAtherosclerosis Carotid Artery

Atherosclerosis Carotid Artery

ICD-10 Coding for Atherosclerosis of the Carotid Artery(I65.22, I70.90)

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

Diagnosis Overview

What is Atherosclerosis Carotid Artery?
Essential facts and insights about Atherosclerosis of the Carotid Artery

Key Clinical Considerations:

  • Patients may present with transient ischemic attacks (TIAs), stroke symptoms, or asymptomatic carotid artery disease.
  • Doppler ultrasound may show reduced blood flow or plaque buildup in the carotid arteries.
  • Physical examination may reveal bruits over the carotid arteries.
  • Imaging studies such as CT angiography or MR angiography may demonstrate stenosis or occlusion of the carotid artery.
  • Severity is often classified based on the percentage of stenosis: mild (less than 50%), moderate (50-69%), and severe (70% or greater).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's symptoms, risk factors (e.g., hypertension, diabetes), and family history.
  • Use specific terminology such as 'stenosis', 'occlusion', or 'plaque' when describing findings.
  • Examples include: 'Patient presents with 70% stenosis of the right carotid artery as confirmed by ultrasound.'
  • Medical necessity must be established, particularly for imaging studies and surgical interventions.
  • Quality measures may include documentation of risk factor management and follow-up care.

Coding Guidelines

Usage Guidelines & Examples

  • Use I65.22 for occlusion and stenosis of the right carotid artery and I70.90 for unspecified atherosclerosis.
  • Do not use I65.22 if the condition is due to non-atherosclerotic causes such as dissection or trauma.
  • I70.0 (Atherosclerosis of aorta) may be used in conjunction with carotid artery codes if applicable.
  • Common errors include misclassifying the severity of stenosis or failing to document the laterality.
  • In complex cases, ensure to document all relevant findings and consider additional codes for associated conditions.

Code Exclusions

Important Exclusions

  • Exclude codes for carotid artery dissection (I77.1) and non-atherosclerotic occlusions.
  • Alternative codes may include I65.21 for left carotid artery conditions.
  • Conditions are excluded to ensure accurate representation of atherosclerotic disease specifically.
  • Common mistakes include using atherosclerosis codes for non-atherosclerotic conditions.
  • Related conditions such as carotid artery aneurysm (I72.0) should be coded separately.

Related ICD-10 Codes

Primary Codes
I65.22
Occlusion and stenosis of right carotid artery
I70.90
Unspecified atherosclerosis
Ancillary Codes
E11.51
Differential Codes
I65.23
I65.22

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Vascular Surgery

Specialty Applications

  • Patients with a history of cardiovascular disease, particularly those with risk factors for atherosclerosis.
  • Typically affects older adults, but younger patients with risk factors may also be diagnosed.
  • Clinical settings include outpatient vascular clinics, inpatient hospital settings, and emergency departments.
  • Relevant for vascular surgery, cardiology, and primary care specialties.
  • Used in treatment contexts such as surgical intervention (e.g., carotid endarterectomy) or medical management.

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 atherosclerosis of the carotid artery based on ultrasound findings.'

Template 2

Template: 'Clinical presentation consistent with carotid artery stenosis including transient ischemic attacks.'

Template 3

Template: 'Diagnostic criteria met as evidenced by 70% stenosis on imaging studies.'

Template 4

Template: 'Treatment plan initiated for carotid artery disease with lifestyle modifications and medication.'

Template 5

Template: 'Follow-up care for carotid artery stenosis including monitoring of blood pressure and cholesterol levels.'

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 treatment plans.

How does this differ from similar diagnoses?

Differentiation is based on the location and severity of arterial blockage.

What are common billing considerations?

Ensure medical necessity is documented for imaging and procedures.

What procedures are typically associated?

CPT codes for carotid endarterectomy (35301) and stenting (37215) may apply.

Are there any quality reporting implications?

Quality measures may include tracking of risk factor management and outcomes.