carotid

DEFINITION of carotid

The term carotid refers to either of the two common carotid arteries — the right and left — that ascend through the neck and bifurcate into the internal carotid artery (ICA) and external carotid artery (ECA). The ICA supplies the brain and eyes; the ECA supplies the face and neck. The carotid arteries contain the carotid sinus (a baroreceptor that regulates blood pressure) and the carotid body (a chemoreceptor). Clinically, carotid disease most commonly refers to carotid artery stenosis from atherosclerotic plaque at the bifurcation, which is a leading cause of ischemic stroke and TIA.

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ETYMOLOGY of carotid

greek

Component	Origin	Meaning
carotid	Greek karōtis (καρωτίς), from karoun (καροῦν)	“To stupefy” or “to plunge into deep sleep”

The ancient Greeks noted that compression of these arteries caused loss of consciousness (due to reduced cerebral blood flow) — hence “the arteries that make you sleep.” The term was used by Galen (2nd century AD).

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🔀 ALIASES / ALTERNATE TERMS

• Common carotid artery (CCA)
• Internal carotid artery (ICA)
• External carotid artery (ECA)
• Carotid bifurcation (the fork where CCA splits into ICA/ECA, typically at C3-C4)
• Carotid artery disease (CAD)
• Carotid artery stenosis (CAS)
• Cervical carotid artery
• Supra-aortic trunk (broader anatomical grouping)

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🔗 RELATED TERMS

• Carotid stenosis — narrowing of the carotid lumen, usually atherosclerotic
• Carotid endarterectomy (CEA) — surgical removal of plaque from carotid artery
• Carotid artery stenting (CAS) — percutaneous stent placement
• TIA (Transient Ischemic Attack) — temporary carotid-territory ischemia
• Carotid body tumor (paraganglioma) — rare tumor at the bifurcation
• Carotid sinus syndrome — syncope due to hypersensitive baroreceptors
• Carotid dissection — tear in the arterial wall, often traumatic or spontaneous
• Carotid aneurysm — focal dilation of the carotid artery
• Carotid duplex ultrasound — primary imaging tool for carotid stenosis
• CTA/MRA of the neck — advanced imaging of carotid vessels
• Stroke / Cerebral infarction — primary feared consequence of carotid disease
• Vertebrobasilar insufficiency — related posterior circulation disorder

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CODING CORNER

🏥 ICD-10-CM CODES

Stenosis / Occlusion

Code	Description
I65.21	Occlusion and stenosis of right carotid artery
I65.22	Occlusion and stenosis of left carotid artery
I65.23	Occlusion and stenosis of bilateral carotid arteries
I65.29	Occlusion and stenosis of unspecified carotid artery

Cerebral Infarction Due to Carotid Disease

Code	Description
I63.031	Cerebral infarction due to thrombosis of right carotid artery
I63.032	Cerebral infarction due to thrombosis of left carotid artery
I63.033	Cerebral infarction due to thrombosis of bilateral carotid arteries
I63.039	Cerebral infarction due to thrombosis of unspecified carotid artery
I63.131	Cerebral infarction due to embolism of right carotid artery
I63.132	Cerebral infarction due to embolism of left carotid artery
I63.133	Cerebral infarction due to embolism of bilateral carotid arteries
I63.139	Cerebral infarction due to embolism of unspecified carotid artery

Other Carotid Pathology

Code	Description
I72.0	Aneurysm of carotid artery
I77.71	Dissection of carotid artery
G45.1	Carotid artery syndrome (hemispheric) — TIA

Carotid Graft Complications (Category T82 — with 7th character required)

Code	Description
T82.311A	Breakdown (mechanical) of carotid arterial graft (bypass), initial encounter
T82.311D	Breakdown (mechanical) of carotid arterial graft (bypass), subsequent encounter
T82.311S	Breakdown (mechanical) of carotid arterial graft (bypass), sequela
T82.321A	Displacement of carotid arterial graft (bypass), initial encounter
T82.321D	Displacement of carotid arterial graft (bypass), subsequent encounter
T82.321S	Displacement of carotid arterial graft (bypass), sequela
T82.331A	Leakage of carotid arterial graft (bypass), initial encounter
T82.331D	Leakage of carotid arterial graft (bypass), subsequent encounter
T82.331S	Leakage of carotid arterial graft (bypass), sequela

Carotid Trauma (Category S15 — 7th character required)

Code	Description
S15.001A	Unspecified injury of right carotid artery, initial encounter
S15.002A	Unspecified injury of left carotid artery, initial encounter
S15.011A	Minor laceration of right carotid artery, initial encounter
S15.012A	Minor laceration of left carotid artery, initial encounter
S15.021A	Major laceration of right carotid artery, initial encounter
S15.022A	Major laceration of left carotid artery, initial encounter
S15.091A	Other specified injury of right carotid artery, initial encounter
S15.092A	Other specified injury of left carotid artery, initial encounter

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🔧 COMMON CPT CODES (Carotid-Related Procedures)

CPT Code	Description
35301	Thromboendarterectomy, carotid, vertebral, subclavian artery (by neck incision)
35390	Reoperation, carotid, thromboendarterectomy, more than 1 month after original
37215	Transcatheter placement of intravascular stent(s), cervical carotid artery, with embolic protection
37216	Transcatheter placement of intravascular stent(s), cervical carotid artery, without embolic protection
37217	Transcatheter placement of intravascular stent(s), intrathoracic common carotid/innominate, with embolic protection
37218	Transcatheter placement of intravascular stent(s), intrathoracic common carotid/innominate, without embolic protection
93880	Duplex scan of extracranial arteries, bilateral
93882	Duplex scan of extracranial arteries, unilateral or limited
93886	Transcranial Doppler study (TCD), intracranial arteries, complete
75671	Angiography, carotid, cerebral, bilateral
75680	Angiography, carotid, cervical, bilateral
70498	CT angiography, neck (carotid)
70547	MRA, neck (without contrast)
70548	MRA, neck (with contrast)
70549	MRA, neck (with and without contrast)

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⚠️ Coding Note: For inpatient coding, carotid stenosis (I65.2x) is a common CC/MCC driver. Always confirm laterality from the operative/imaging report. When a stroke is the principal diagnosis, the carotid stenosis may be coded as an additional diagnosis. For carotid endarterectomy, verify if the approach was open (CEA) vs. endovascular (stenting) and whether embolic protection was used — it affects CPT selection significantly.

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DERIVATIONS of carotid

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Query functionality

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Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms