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ICD-10 Guide
DiagnosesArterial Stenosis

Arterial Stenosis

ICD-10 Coding for Arterial Stenosis(I77.1, I65.21)

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

Diagnosis Overview

What is Arterial Stenosis?
Essential facts and insights about Arterial Stenosis

Key Clinical Considerations:

  • Patients may present with symptoms such as claudication, limb pain, or ischemic rest pain.
  • Doppler ultrasound may reveal reduced blood flow or abnormal waveforms in affected arteries.
  • Physical examination may show diminished or absent pulses in the affected limb.
  • Imaging studies such as angiography or CT angiography may demonstrate narrowing of the arterial lumen.
  • Severity can be assessed based on the degree of stenosis (e.g., mild, moderate, severe) and its impact on blood flow.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must include a clear diagnosis of arterial stenosis supported by clinical findings.
  • Specific terminology such as 'stenosis', 'occlusion', or 'atherosclerosis' must be documented.
  • Examples include documenting the location and severity of stenosis, such as '70% stenosis of the left femoral artery'.
  • Documentation must demonstrate medical necessity for interventions, such as imaging or surgical procedures.
  • Quality measures may require documentation of risk factors, treatment plans, and follow-up care.

Coding Guidelines

Usage Guidelines & Examples

  • Use I77.1 for non-specific arterial stenosis and I65.21 for stenosis of the carotid artery with cerebral ischemia.
  • Do not use these codes for conditions like peripheral artery disease (PAD) without stenosis or other vascular disorders.
  • I70.2 (Atherosclerosis of the arteries of the extremities) may be used in conjunction with arterial stenosis codes.
  • Common errors include misclassifying the severity of stenosis or failing to document the specific artery involved.
  • In complex cases, consider the patient's overall vascular health and any co-existing conditions when selecting codes.

Code Exclusions

Important Exclusions

  • Excludes conditions like venous stenosis or arterial dissection.
  • Alternative codes for excluded conditions include I82 (Other venous embolism and thrombosis).
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include misclassifying venous issues as arterial stenosis.
  • Related but distinct conditions include peripheral artery disease and aortic stenosis.

Related ICD-10 Codes

Primary Codes
I77.1
Non-specific arterial stenosis
I65.21
Occlusion and stenosis of carotid artery, right side
Ancillary Codes
T82.855A
Differential Codes
I70.2
I65.22

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Vascular Surgery

Specialty Applications

  • Applies to patients with vascular diseases, particularly those with atherosclerosis.
  • Common in older adults, particularly those with risk factors like smoking or diabetes.
  • Relevant in both inpatient and outpatient settings, especially in vascular surgery.
  • Specialty-specific applications include vascular surgery, cardiology, and interventional radiology.
  • Used in treatment contexts such as angioplasty, stenting, or surgical bypass.

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 arterial stenosis based on Doppler ultrasound findings.'

Template 2

Template: 'Clinical presentation consistent with arterial stenosis including intermittent claudication.'

Template 3

Template: 'Diagnostic criteria met as evidenced by 70% stenosis of the left femoral artery on angiography.'

Template 4

Template: 'Treatment plan initiated for arterial stenosis with angioplasty scheduled.'

Template 5

Template: 'Follow-up care for arterial stenosis including monitoring of blood flow 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 clinical findings, imaging results, and treatment plans.

How does this differ from similar diagnoses?

Arterial stenosis specifically refers to narrowing of arteries, while other conditions may involve different mechanisms.

What are common billing considerations?

Ensure accurate coding to reflect the severity and location of stenosis for optimal reimbursement.

What procedures are typically associated?

Common procedures include angioplasty, stenting, and bypass surgery.

Are there any quality reporting implications?

Quality measures may include tracking outcomes of interventions and adherence to treatment guidelines.