CMS Digital Subtraction Angiography Coverage Policy Update (NCD 255) — What Billing Teams Need to Know

CMS has modified its National Coverage Determination for Digital Subtraction Angiography under NCD 255, with an effective date of March 12, 2026. This update reinforces longstanding Medicare payment principles for DSA while flagging utilization concerns that Medicare Administrative Contractors (MACs) are expected to monitor closely. If your practice or facility bills for vascular imaging services, this policy warrants a careful review before the effective date.

What Is Digital Subtraction Angiography Under CMS NCD 255?

Digital subtraction angiography is a fluoroscopy-based diagnostic imaging technique that uses computer processing to produce clear images of blood vessels — the same vascular structures visible through conventional angiography. The key clinical distinction is that DSA allows radiographic contrast material to be injected intravenously rather than intra-arterially, which meaningfully reduces procedural risk for patients.

Because DSA carries a lower risk profile than conventional arterial angiography, it can typically be performed on an outpatient basis. This is a point CMS has built directly into the policy: patients should not ordinarily require inpatient hospitalization solely to undergo DSA. Billing for an inpatient stay where DSA is the primary driver of admission is a red flag under this NCD.

The Centers for Medicare & Medicaid Services classifies DSA under the Diagnostic Tests (other) benefit category for Medicare purposes, though CMS notes this may not be an exhaustive list of all applicable Medicare benefit categories for this item or service.

CMS Payment Rules for DSA vs. Conventional Angiography

One of the most operationally significant provisions in NCD 255 is the payment ceiling: reimbursement for DSA should not exceed — and may actually be less than — what is being paid for conventional angiographic techniques. This is not simply a soft guideline. It is a hard payment rule that MACs are expected to enforce.

For revenue cycle teams, this creates a specific billing discipline requirement. If your current fee schedule or charge capture process allows DSA claims to be submitted at rates above conventional angiography equivalents, you have a compliance gap that needs to be closed before March 2026.

This payment parity (or discount) rule also affects how you approach payer contract negotiations if your organization bills commercial plans that follow CMS policy as a baseline. The CMS position here could anchor downward pressure on DSA reimbursement across multiple payers.

MAC Utilization Review: What CMS Is Watching

CMS has issued an explicit directive to Medicare Administrative Contractors to monitor for increases in DSA utilization relative to conventional angiographic procedures. This is unusual language for an NCD — it signals that CMS has concerns about substitution patterns, where DSA might be billed at higher volumes than clinically warranted, or in place of conventional angiography without appropriate justification.

In practical terms, this means MACs may be running utilization comparisons across providers billing DSA, looking for outliers. If your practice has seen a significant shift toward DSA billing over the past 12–18 months, it's worth conducting an internal audit before the effective date to ensure your clinical documentation supports the medical necessity of each claim.

Billing patterns that could draw MAC scrutiny include: a steep increase in DSA claims relative to your historical conventional angiography volume, DSA claims associated with inpatient facility fees when no other condition warranted admission, or DSA claims submitted at rates exceeding conventional angiography reimbursement.

Affected Codes

The policy does not list specific CPT, HCPCS, or ICD-10 codes. NCD 255 applies broadly to digital subtraction angiography as a service category. Billing teams should work with their coding team and MAC-specific Local Coverage Determinations (LCDs) to identify the exact CPT codes used in their claims for DSA procedures, and cross-reference those against current payment allowables for conventional angiographic equivalents.

Because no specific codes are enumerated in this NCD, the absence of a code list does not mean any DSA procedure is automatically covered or excluded — it means coverage determinations rely on the policy criteria above, and MAC-level guidance will carry significant weight in how claims are adjudicated.

What Your Billing Team Should Do