Vascular Surgery Prior Authorization and Denial Guide

Carotid artery stenting NCD 20.7 requirements, carotid endarterectomy stenosis documentation standards, dialysis access vascular mapping and creation procedures, peripheral bypass graft medical necessity criteria, and endovascular aneurysm repair prior authorization. Grounded in CMS NCD 20.7 for carotid artery stenting, Aetna Medical Policy for vascular procedures, UHC CDG Vascular Surgery, and SVS clinical practice guidelines.

Carotid artery stenting (CAS, CPT 37215–37216): Medicare coverage under NCD 20.7 is limited to patients with symptomatic carotid stenosis ≥70% who are at high risk for carotid endarterectomy (CEA), and asymptomatic carotid stenosis ≥80% who are also high surgical risk AND are enrolled in a CMS-approved clinical study. High surgical risk criteria are defined in the NCD. Commercial payer criteria vary and are generally more permissive than Medicare NCD 20.7. Carotid endarterectomy (CPT 35301) is covered for symptomatic stenosis ≥50% and asymptomatic stenosis ≥60% at most commercial payers, based on NASCET and ACAS trial data.

Dialysis access: arteriovenous fistula creation (CPT 36818–36821) and AV graft placement (CPT 36830) require prior authorization from most commercial payers. Documentation must include the indication (ESRD or advanced CKD requiring hemodialysis), vascular mapping results (duplex ultrasound), and access planning rationale. Peripheral arterial bypass surgery requires documentation of failed percutaneous intervention where appropriate, ankle-brachial index, imaging confirming occlusive disease, and symptom severity. Endovascular aortic aneurysm repair (EVAR, CPT 34701–34706) requires pre-procedural anatomic assessment (CTA or MRA) confirming the aneurysm meets size criteria (typically ≥5.5 cm for elective repair) and the landing zone anatomy is suitable for endovascular approach.