CMS Updates Coverage Policy for Vertebral Artery Surgery (NCD 48): What Billing Teams Need to Know
CMS has modified National Coverage Determination (NCD) 48, which governs Medicare coverage for vertebral artery surgery — a set of five distinct surgical procedures used to relieve obstructions that reduce blood flow to the brain. The update, effective March 12, 2026, reinforces strict medical necessity criteria that must be documented before any of these procedures can be considered covered under Medicare's Inpatient Hospital Services and Physicians' Services benefit categories. If your practice or facility bills for vascular or neurovascular procedures, this policy deserves a close look before that effective date.
| Field | Detail |
|---|---|
| Payer | Centers for Medicare & Medicaid Services (CMS) |
| Policy | Vertebral Artery Surgery |
| Policy Code | NCD 48 |
| Change Type | Modified |
| Effective Date | 2026-03-12 |
| Impact Level | Medium |
| Specialties Affected | Vascular Surgery, Neurovascular Surgery, Interventional Radiology, Neurology |
| Key Action | Audit pre-authorization and medical necessity documentation workflows to ensure all four required coverage criteria are captured before procedure scheduling. |
What CMS Covers Under NCD 48: Vertebral Artery Surgery
CMS recognizes five specific surgical procedures for relieving vertebral artery obstruction under this NCD:
- Vertebral artery endarterectomy — surgical removal of arteriosclerotic plaques from inside the vessel
- Vertebral artery bypass or resection with anastomosis or graft — rerouting blood flow around the obstruction
- Subclavian artery resection with or without endarterectomy — addressing obstruction at the subclavian level, including cases of subclavian steal syndrome
- Removal of laterally located osteophytes — bony tissue removal along the C6(C7)-C2 course of the vertebral artery
- Arteriolysis — freeing the artery from surrounding fibrous or connective tissue, with or without arteriopexy
These procedures address obstructions that can cause a range of serious neurological symptoms: vertigo, visual or speech defects, ataxia, mental confusion, and stroke. The clinical picture ranges from transient basilar ischemia all the way to completed stroke or progressive mental deterioration — making accurate diagnosis and documentation essential before proceeding to surgery.
CMS Medical Necessity Criteria for Vertebral Artery Surgery Coverage
This is where denials happen. CMS will only consider these procedures medically reasonable and necessary when all four of the following conditions are met and documented:
| # | Covered Indication |
|---|---|
| 1 | Symptoms of vertebral artery obstruction are present — the patient must be exhibiting clinical signs consistent with reduced vertebral artery blood flow |
| 2 | Other causes have been considered and ruled out — the differential diagnosis must be worked through, including degenerative brain disorders, orthostatic hypotension, acoustic neuroma, labyrinthitis, diabetes mellitus, and hypoglycemia-related disorders |
| 3 | Radiographic evidence of a valid vertebral artery obstruction exists — imaging must confirm the obstruction |
| 4 | No contraindications exist — specifically, coexistent obstructions of multiple cerebral vessels can disqualify the patient from coverage |
Meeting three of four criteria is not enough. Every criterion must be addressed in the medical record for a claim to survive scrutiny.
Angiography Requirements: What the Imaging Documentation Must Show
CMS sets specific standards for the angiograms used to document vertebral artery obstruction. The imaging workup must include:
- Views of the aortic arch with vessels off the arch
- Views of vessels in the neck and head, with biplane views of both the carotid and vertebral vascular systems
- Serial views sufficient to diagnose subclavian steal syndrome — the condition where subclavian artery obstruction mimics vertebral artery obstruction symptoms
This level of imaging detail isn't just good clinical practice — it's a coverage requirement. Claims submitted without documentation confirming this imaging protocol was completed are vulnerable to denial on medical necessity grounds. Ensure your clinical documentation templates prompt the ordering physician to confirm that the angiographic workup met these specific standards.
Coverage Nuances: Controversial Obstructions and Coding Terminology
NCD 48 calls out a few areas where clinical opinion and coverage policy intersect carefully.
Tortuosity, kinks, and fibrous tissue along the vertebral artery course — including external bands, tendinous slings, and fibrous bands — are acknowledged by CMS as controversial. Vascular surgery experts agree these abnormalities are insignificant in the absence of symptoms. However, CMS does recognize that in rare cases, these findings do cause genuine obstruction symptoms and may warrant surgical correction. The key word is rare — documentation must be airtight when billing for procedures addressing these findings.
Terminology matters for claim submission. CMS explicitly notes that "vertebral artery construction" and "vertebral artery surgery" are terms interpreted differently by different physicians. Some use them to mean only endarterectomy and bypass procedures; others use them to encompass all operative manipulations that remove blood flow obstructions. Your billing team should ensure procedure descriptions on claims align precisely with what was actually performed — not a general surgical term that could be read multiple ways by a claims reviewer.
| 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 |
Affected Codes
The policy data provided for NCD 48 (policy key 48-v1) does not list specific CPT, HCPCS, or ICD-10 codes. This is consistent with older CMS NCDs that describe covered procedures by clinical description rather than by specific code sets. Your coding team should map the five covered procedure types described above to the appropriate CPT codes using current AMA guidance and cross-reference with your Medicare Administrative Contractor (MAC) for any local coding guidance that applies in your jurisdiction.
Because no specific codes are enumerated in this NCD, code selection accuracy is entirely dependent on the surgeon's operative report. Vague or incomplete operative documentation is a direct path to a coding error — and a potential audit finding.
What Your Billing Team Should Do
| # | Action Item |
|---|---|
| 1 | Before March 12, 2026, update your pre-authorization and medical necessity checklist to explicitly capture all four required coverage criteria. Every case moving toward vertebral artery surgery should have a documented checklist confirming symptom presence, differential diagnosis workup, imaging results, and contraindication review. |
| 2 | Audit recent claims for these procedures against the four medical necessity criteria. If prior claims were submitted without documentation of a complete differential diagnosis or without confirming the angiographic protocol, assess whether any corrective action or proactive review is warranted. |
| 3 | Brief your vascular surgeons and operative documentation team on the angiography requirements. The imaging workup must show the aortic arch, cervical and cranial vessels, and include serial views for subclavian steal diagnosis — and the clinical note must confirm this. Consider a documentation template that prompts surgeons to attest to this workup. |
| 4 | Contact your MAC for local coding guidance. Since NCD 48 does not enumerate specific CPT codes, your regional Medicare Administrative Contractor may have issued Local Coverage Determinations (LCDs) or billing articles that provide code-level guidance. Cross-reference those resources now rather than after a denial. |
| 5 | Flag cases involving tortuosity, kinks, or fibrous band removal for additional documentation review before claim submission. These are the highest-risk procedures under this NCD — the clinical record needs to clearly establish that symptoms were present and that the obstruction was confirmed as the cause. |
Get the Full Picture
Track this policy across versions, search 1,500+ policies by CPT code, and get real-time alerts when any payer changes coverage.