TL;DR: The Centers for Medicare & Medicaid Services modified NCD 48, the National Coverage Determination governing vertebral artery surgery under Medicare, with an effective date of January 9, 2026. Here's what billing teams need to know before submitting claims.
The CMS vertebral artery surgery coverage policy covers five distinct surgical procedures used to restore blood flow through the vertebral artery. NCD 48 in the CMS Medicare system sets strict medical necessity criteria that your claims must satisfy — and the differential diagnosis requirements alone create real denial risk if documentation is thin. This policy does not list specific CPT codes, so your team needs to map procedures to the correct codes independently. We'll walk through exactly what the policy requires and where denials happen.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Centers for Medicare & Medicaid Services (CMS) |
| Policy | Vertebral Artery Surgery — NCD 48 |
| Policy Code | NCD 48 |
| Change Type | Modified |
| Effective Date | 2026-01-09 |
| Impact Level | Medium |
| Specialties Affected | Vascular surgery, neurosurgery, cardiovascular surgery, interventional radiology |
| Key Action | Audit documentation for all four medical necessity criteria before submitting claims on or after January 9, 2026 |
CMS Vertebral Artery Surgery Coverage Criteria and Medical Necessity Requirements 2026
NCD 48 covers vertebral artery surgery under Medicare when four specific conditions are all met. Miss one, and the claim fails medical necessity. The four required conditions are:
| # | Covered Indication |
|---|---|
| 1 | Symptoms of vertebral artery obstruction must exist |
| 2 | Other causes must have been considered and ruled out |
| 3 | Radiographic evidence of a valid vertebral artery obstruction must be present |
| 4 | No contraindications to the procedure exist — particularly coexistent obstructions of multiple cerebral vessels |
That fourth criterion is worth flagging. A patient with obstruction across multiple cerebral vessels is not a candidate under this coverage policy. If your documentation doesn't address this explicitly, expect a denial.
The radiographic requirement has teeth. CMS requires angiograms that show the aortic arch with the vessels off the arch, plus the vessels in the neck and head. You need biplane views of both the carotid and vertebral vascular systems. Serial views are also required when "subclavian steal" is in the differential — that's the condition where subclavian artery obstruction mimics vertebral artery obstruction symptoms.
The differential diagnosis requirement is where claims get into trouble. Because symptoms like vertigo, ataxia, visual defects, speech defects, and mental confusion are not specific to vertebral artery obstruction, CMS requires that the workup consider and rule out a list of other conditions. That list includes degenerative disorders of the brain, orthostatic hypotension, acoustic neuroma, labyrinthitis, diabetes mellitus, and hypoglycemia-related disorders.
Your documentation needs to show this ruling-out process, not just assert it. A chart note that says "other causes excluded" without clinical reasoning won't hold up on audit.
The CMS vertebral artery surgery coverage policy does not mention prior authorization requirements in NCD 48 itself. However, your Medicare Administrative Contractor may have a local coverage determination that layers additional requirements on top of this NCD. Check with your MAC before assuming the NCD is the only standard that applies to your region.
CMS Vertebral Artery Surgery Exclusions and Non-Covered Indications
The most contested area in this coverage policy involves vertebral artery tortuosity, kinks, and connective tissue abnormalities — external bands, tendinous slings, and fibrous bands. CMS acknowledges these are controversial.
The policy is direct about it: in the absence of symptoms of vertebral artery obstruction, vascular surgeons consider these abnormalities clinically insignificant. Surgery on these findings without documented symptoms fails medical necessity under NCD 48.
The one narrow exception is when these anatomical findings are present in a symptomatic patient and vascular surgery experts agree that the abnormality is causing the symptoms. CMS uses the phrase "very rare cases" to describe when surgery on tortuosity, kinks, or fibrous tissue is appropriate. Plan accordingly — that language signals CMS expects scrutiny on these claims.
Vertebral artery surgery billing for cases based solely on incidental anatomical findings, without documented symptoms and a completed differential diagnosis, will not hold up under a medical necessity review.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Vertebral artery endarterectomy (arteriosclerotic plaque removal) | Covered — when all four criteria met | No specific CPT listed in NCD | Requires angiographic documentation and differential diagnosis |
| Vertebral artery bypass or resection with anastomosis or graft | Covered — when all four criteria met | No specific CPT listed in NCD | Full biplane angiography required |
| Subclavian artery resection with or without endarterectomy | Covered — when all four criteria met | No specific CPT listed in NCD | Serial angiographic views required to rule out subclavian steal |
| Removal of laterally located osteophytes (C6/C7–C2 course) | Covered — when all four criteria met | No specific CPT listed in NCD | Bony obstruction must be documented radiographically |
| Arteriolysis with or without arteriopexy | Covered — when all four criteria met | No specific CPT listed in NCD | Fibrous tissue release; surgical indication must be documented |
| Vertebral artery tortuosity / kinks without symptoms | Not Covered | No specific CPT listed in NCD | Considered insignificant without documented symptom causation |
| External bands / tendinous slings / fibrous bands without symptoms | Not Covered | No specific CPT listed in NCD | Surgery on incidental findings does not meet medical necessity |
| Vertebral artery tortuosity with documented symptomatic causation | Covered — rare cases only | No specific CPT listed in NCD | Requires expert vascular surgery consensus; high documentation burden |
| Any procedure with coexistent multi-vessel cerebral obstruction | Not Covered | No specific CPT listed in NCD | Contraindication explicitly listed in NCD 48 |
CMS Vertebral Artery Surgery Billing Guidelines and Action Items 2026
This policy change took effect on January 9, 2026. If your team hasn't reviewed claim workflows against the updated NCD 48, do it now.
| # | Action Item |
|---|---|
| 1 | Audit your documentation templates against the four-part medical necessity test. Every vertebral artery surgery claim needs to show: documented symptoms, a completed differential diagnosis, qualifying angiography, and the absence of multi-vessel contraindications. Build these as hard checkpoints in your pre-bill review, not afterthoughts. |
| 2 | Verify your angiography documentation meets CMS's specific imaging standard. The claim needs to reflect biplane views of both the carotid and vertebral vascular systems, plus the aortic arch with vessels off the arch. If the operative record references imaging but the imaging report isn't in the file, get it before you bill. |
| 3 | Flag all cases involving tortuosity, kinks, or fibrous tissue for extra review. These are the highest-risk indications under NCD 48. The policy language signals CMS will look hard at these claims. Before submitting, confirm that a vascular surgery expert has documented why the anatomical finding is causing the patient's symptoms — and that the documentation uses specific clinical language, not boilerplate. |
| 4 | Check with your MAC for any local coverage determination that applies on top of NCD 48. The NCD sets the floor. Your Medicare Administrative Contractor may have issued an LCD with additional documentation requirements, prior authorization rules, or coding guidance specific to your region. Don't assume the NCD is the complete picture. |
| 5 | Map your procedures to the correct CPT codes internally. NCD 48 does not list specific CPT codes. That means your team is responsible for selecting the right codes based on what was actually performed. Vertebral artery endarterectomy, bypass procedures, subclavian resection, osteophyte removal, and arteriolysis are all distinct procedures — each with its own CPT code. A coding error here creates claim denial risk that has nothing to do with medical necessity. If your vascular surgery coders haven't reviewed their code assignments against the five procedure types in this NCD, do that before the next claim goes out. |
| 6 | Confirm that multi-vessel obstruction cases are excluded from billing under this NCD. If a patient has coexistent obstructions in multiple cerebral vessels, the surgery does not meet the coverage policy criteria. Billing for this scenario creates a medical necessity denial and potential overpayment liability. Loop in your compliance officer if you're uncertain how your documentation characterizes a patient's vascular anatomy. |
| 7 | Review reimbursement on past claims for any pattern that suggests documentation gaps. If you've seen denials or reductions on vertebral artery surgery claims in 2025, pull those records. The modification to NCD 48 effective January 9, 2026 is a good prompt to identify whether there's a systemic documentation issue your team needs to fix. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Vertebral Artery Surgery Under NCD 48
Covered CPT Codes (When All Four Selection Criteria Are Met)
NCD 48 does not list specific CPT, HCPCS, or ICD-10 codes. This policy does not enumerate applicable codes.
Your coding team is responsible for selecting the appropriate CPT codes for the procedure performed. The five covered procedure types described in the policy are vertebral artery endarterectomy, vertebral artery bypass or resection with anastomosis or graft, subclavian artery resection with or without endarterectomy, removal of laterally located osteophytes along the C6/C7–C2 course of the vertebral artery, and arteriolysis with or without arteriopexy.
Work with a vascular surgery coder or your MAC's coding resources to map each procedure type to the correct CPT code. Mismatches between the operative report and the billed code are a common denial trigger on these claims.
Not Covered / Experimental Codes
No specific codes are designated as excluded by NCD 48. Exclusions are indication-based, not code-based. See the Coverage Indications table above for the specific clinical scenarios that do not meet medical necessity under this policy.
Key ICD-10-CM Diagnosis Codes
NCD 48 does not list specific ICD-10-CM codes. Your billing team should select ICD-10 codes that accurately reflect the documented obstruction type, the patient's symptoms, and the procedure indication. Common diagnosis code categories relevant to vertebral artery obstruction include vertebrobasilar insufficiency, arteriosclerosis of vertebral arteries, and related cerebrovascular conditions — but code selection must reflect the actual clinical documentation, not a generic category.
If you're not confident your diagnosis code selection aligns with what CMS reviewers expect to see paired with vertebral artery surgery procedures, talk to your compliance officer or a revenue cycle consultant before the effective date to establish a consistent coding standard.
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