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Home/Diagnosis/ICD-10 Coding for Internal Carotid Artery Stenosis

ICD-10 Coding for Internal Carotid Artery Stenosis

I65.21
I65.22
I65.23

Complete ICD-10-CM coding and documentation guide for icd-10 coding for internal carotid artery stenosis includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
ICA Stenosis
Carotid Artery Narrowing
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Key Information: ICD-10 Coding for Internal Carotid Artery Stenosis

Essential facts and insights about ICD-10 Coding for Internal Carotid Artery Stenosis

Use ICD-10 code I65.21 for stenosis of right carotid artery, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Stenosis of right carotid artery

Billable Code
I65.21
Billable

Diagnostic Criteria

clinical:
  • • Presence of symptoms and PSV ≥180 cm/s
documentation:
  • • Clear documentation of nontraumatic stenosis and laterality

Applicable To

  • • Nontraumatic stenosis of right internal carotid artery

Important Notes

  • • Ensure laterality is documented clearly to avoid unspecified coding.

Stenosis of left carotid artery

Billable Code
I65.22
Billable

Diagnostic Criteria

clinical:
  • • PSV ≥180 cm/s on duplex ultrasound
  • • Asymptomatic with ≥50% stenosis on CTA/MRA

Applicable To

  • • Nontraumatic stenosis of left internal carotid artery

Important Notes

  • • Ensure laterality is documented clearly to avoid unspecified coding.

Stenosis of bilateral carotid arteries

Billable Code
I65.23
Billable

Diagnostic Criteria

clinical:
  • • Bilateral PSV >230 cm/s
  • • Plaque ≥50% on imaging

Applicable To

  • • Nontraumatic stenosis of bilateral internal carotid arteries

Important Notes

  • • Ensure bilateral involvement is documented clearly to avoid unspecified coding.

Stenosis of other cerebral arteries

Billable Code
I66.8
Billable

Diagnostic Criteria

clinical:
  • • Documentation of 'intracranial' or 'supraclinoid' segment involvement

Applicable To

  • • Stenosis of intracranial portion of carotid artery

Important Notes

  • • Ensure the location of stenosis is documented as intracranial.
Ancillary Codes

Additional codes that may be used with this diagnosis

I63.21

Cerebral infarction due to stenosis of right carotid artery

Use if a stroke is caused by the stenosis.

I63.22

Cerebral infarction due to stenosis of left carotid artery

Use if a stroke is caused by the stenosis.

I63.23

Cerebral infarction due to stenosis of bilateral carotid arteries

Use if a stroke is caused by the stenosis.

Frequently Asked Questions

What is the ICD-10 code for right internal carotid artery stenosis?

The ICD-10 code for nontraumatic stenosis of the right internal carotid artery is I65.21.

How is internal carotid artery stenosis documented?

Documentation should specify laterality, degree of stenosis, and include PSV values from imaging to support accurate coding.

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