ICDxICD-10 Medical Coding

ICDxICD-10 Medical Coding

ICD-10 Guide

Arteriosclerosis

ICD-10 Coding for Arteriosclerosis(I70.21, E11.51)

PRIMARY SPECIALTYEndocrinology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Arteriosclerosis?

Essential facts and insights about Arteriosclerosis

Key Clinical Considerations:

Presence of symptoms such as intermittent claudication, leg pain, or weakness during physical activity.
Laboratory findings may include elevated cholesterol levels, elevated blood pressure, and abnormal glucose levels.
Physical examination findings may include diminished or absent pulses in the extremities, bruits over major arteries, and skin changes such as hair loss or ulcers.
Imaging findings may include angiography showing narrowed or blocked arteries, ultrasound revealing plaque buildup, or CT/MRI showing vascular abnormalities.
Severity criteria may include the degree of arterial blockage, presence of ischemic symptoms, and impact on daily activities.

Clinical Information

Clinical Criteria & Documentation Requirements

Medical records must include a clear diagnosis of arteriosclerosis supported by clinical findings.
Specific terminology such as 'atherosclerosis', 'peripheral artery disease', or 'ischemic heart disease' must be documented when applicable.
Documentation examples include: 'Patient presents with claudication symptoms consistent with arteriosclerosis' or 'Imaging confirms significant stenosis in the femoral artery'.
Medical necessity must be established through documentation of symptoms, diagnostic tests, and treatment plans.
Quality measures may include documentation of risk factor management, such as blood pressure control and lipid management.

Coding Guidelines

Usage Guidelines & Examples

Use I70.21 for atherosclerosis of native arteries of the extremities with intermittent claudication.
Do not use this code for conditions such as venous insufficiency or other forms of vascular disease that do not involve arteriosclerosis.
Compare with I70.20 for atherosclerosis without claudication and E11.51 for diabetic peripheral angiopathy.
Common coding errors include using the wrong code for the severity of the condition or failing to document the presence of claudication.
In complex cases, ensure to document all relevant comorbidities and symptoms to support the selected code.

Code Exclusions

Important Exclusions

Excludes conditions such as venous thrombosis, varicose veins, and other non-arterial vascular diseases.
Alternative codes for excluded conditions include I87.2 for venous insufficiency.
Conditions are excluded because they involve different pathophysiological processes than arteriosclerosis.
Common exclusion mistakes include misclassifying venous conditions as arterial diseases.
Related but distinct conditions include aortic aneurysm and peripheral venous disease.

Specialty Focus

Primary Specialty

Endocrinology

Specialty Applications

Applies to patients with cardiovascular risk factors such as obesity, smoking, and sedentary lifestyle.
Patient populations include adults, particularly those over 50 years of age, and individuals with diabetes.
Clinical settings include outpatient clinics, inpatient hospital settings, and emergency departments.
Specialty-specific applications are relevant in cardiology, endocrinology, and vascular surgery.
Treatment contexts include lifestyle modification, pharmacotherapy, and surgical interventions.

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 arteriosclerosis based on clinical findings of intermittent claudication.'

Template 2

Template: 'Clinical presentation consistent with arteriosclerosis including leg pain during exertion.'

Template 3

Template: 'Diagnostic criteria for arteriosclerosis met as evidenced by imaging showing significant arterial stenosis.'

Template 4

Template: 'Treatment plan initiated for arteriosclerosis with lifestyle modifications and pharmacotherapy.'

Template 5

Template: 'Follow-up care for arteriosclerosis including monitoring of blood pressure and lipid 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?

Documentation must include clinical symptoms, diagnostic test results, and treatment plans.

How does this differ from similar diagnoses?

Arteriosclerosis specifically refers to arterial hardening, while other conditions may involve veins or different vascular issues.

What are common billing considerations?

Ensure accurate coding to reflect the severity of the condition and document medical necessity for treatments.

What procedures are typically associated?

Common procedures include angioplasty, stenting, and vascular bypass surgery.

Are there any quality reporting implications?

Quality measures may include monitoring of blood pressure, cholesterol levels, and patient education on lifestyle changes.