TL;DR: The Centers for Medicare & Medicaid Services modified NCD 255 governing digital subtraction angiography coverage, effective January 9, 2026. Here's what billing teams need to know before submitting claims.
CMS digital subtraction angiography coverage policy under NCD 255 sets the Medicare reimbursement ceiling for DSA at or below what conventional angiographic procedures pay — and it gives Medicare Administrative Contractors explicit authority to monitor utilization. This policy does not list specific CPT or HCPCS codes, so your billing team needs to cross-reference current angiography codes against local coverage determinations from your MAC. The real risk here is overbilling — submitting DSA claims at rates above conventional angiography and triggering a denial or audit.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Digital Subtraction Angiography — NCD 255 |
| Policy Code | NCD 255 |
| Change Type | Modified |
| Effective Date | January 9, 2026 |
| Impact Level | Medium |
| Specialties Affected | Radiology, Interventional Radiology, Vascular Surgery, Cardiology |
| Key Action | Verify that DSA reimbursement on active fee schedules does not exceed rates for conventional angiography, and audit claims submitted after January 9, 2026 |
CMS Digital Subtraction Angiography Coverage Criteria and Medical Necessity Requirements 2026
NCD 255 is the National Coverage Determination governing Medicare coverage of digital subtraction angiography. DSA uses computer processing layered over fluoroscopy to visualize vascular structures — the same structures you'd see with conventional angiography. The key clinical difference is contrast delivery: DSA allows intravenous injection rather than intra-arterial injection, which reduces patient risk and makes outpatient delivery possible.
That outpatient capability is where medical necessity gets complicated. CMS is direct in the policy: patients should not require inpatient hospitalization solely to perform DSA. If your facility is billing DSA in an inpatient setting without a documented clinical reason beyond the procedure itself, that's a medical necessity problem. The procedure's design — lower risk, outpatient-appropriate — works against inpatient justification.
Whether DSA is covered under Medicare follows the same general framework as conventional angiography. The CMS digital subtraction angiography coverage policy confirms DSA is a covered diagnostic service under the "Diagnostic Tests (other)" benefit category. Coverage isn't the issue. Rate and setting are.
Prior authorization is not explicitly required by this NCD, but that doesn't mean your MAC hasn't layered additional requirements on top. Check your MAC's local coverage determination before assuming prior auth is off the table for your region.
CMS Digital Subtraction Angiography Reimbursement Cap and Utilization Concerns 2026
This is the part of NCD 255 that billing teams need to read carefully. CMS states plainly that payment for DSA should not exceed — and may be less than — what's being paid for conventional angiographic techniques. That's a ceiling, not a floor.
The practical implication: if your charge capture or fee schedule has DSA coded at a higher rate than conventional angiography, you have a compliance problem as of January 9, 2026. Fix it before claims go out, not after a claim denial forces the correction.
CMS also flags utilization monitoring directly in the policy. Medicare Administrative Contractors are instructed to watch for increases in DSA volume relative to conventional angiography. That's not boilerplate — CMS is telling MACs to look for substitution patterns and question whether the shift is clinically justified or financially motivated. If your DSA volume has been climbing, expect scrutiny.
The reimbursement ceiling combined with MAC-level monitoring creates a specific audit exposure. Your billing guidelines for DSA need to reflect both the rate cap and the documentation requirements that justify outpatient setting over inpatient.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Visualization of vascular structures (outpatient) | Covered | Not specified in NCD 255 — cross-reference MAC LCD | Intravenous contrast acceptable; outpatient preferred setting |
| Visualization of vascular structures (inpatient, medically necessary) | Covered with documentation | Not specified in NCD 255 | Must document clinical reason for inpatient beyond the procedure itself |
| Inpatient DSA without clinical justification beyond procedure | Not covered / Medical necessity concern | Not specified in NCD 255 | CMS policy states patients should not require inpatient admission solely for DSA |
| DSA billed above conventional angiography rate | Not reimbursable at higher rate | Not specified in NCD 255 | Payment ceiling is conventional angiography rate; DSA reimbursement may be less |
CMS Digital Subtraction Angiography Billing Guidelines and Action Items 2026
| # | Action Item |
|---|---|
| 1 | Audit your fee schedule before January 9, 2026. Pull every DSA line item and compare it against your current conventional angiography rates. If DSA is priced above conventional angio on any payer contract or internal charge master, correct it now. A claim denial after the effective date is harder to appeal when the NCD language is this clear. |
| 2 | Pull your MAC's local coverage determination for angiography. NCD 255 does not list specific CPT or HCPCS codes. Your MAC's LCD fills that gap. Contact your Medicare Administrative Contractor or check their website for the applicable angiography LCD and confirm which codes they recognize for DSA billing. |
| 3 | Review documentation for all inpatient DSA claims. For any DSA performed in an inpatient setting, your documentation needs to show a clinical reason for inpatient admission that goes beyond the DSA procedure itself. "Patient needs DSA" is not sufficient justification for inpatient status under this policy. |
| 4 | Brief your utilization review team on the MAC monitoring language. CMS has explicitly told MACs to watch DSA utilization trends. If your practice has shifted volume from conventional angiography to DSA, document the clinical rationale for that shift. Prepare for potential medical necessity reviews. |
| 5 | Check prior authorization requirements with your MAC. NCD 255 doesn't mandate prior auth for DSA, but your regional MAC may. Confirm this before the January 9, 2026 effective date to avoid unexpected denials on clean claims. |
| 6 | Set a claims review checkpoint for Q1 2026. Plan an internal audit of DSA claims submitted after January 9, 2026. Look specifically at reimbursement rates paid versus conventional angiography rates and at inpatient versus outpatient setting distribution. If you're unsure how to structure this review for your payer mix, talk to your compliance officer before the effective date. |
| 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 Digital Subtraction Angiography Under NCD 255
Covered CPT Codes
This policy does not list specific CPT or HCPCS codes. NCD 255 covers digital subtraction angiography as a diagnostic service under the "Diagnostic Tests (other)" Medicare benefit category, but code-level specificity is not provided in the national policy. Your Medicare Administrative Contractor's local coverage determination governs which specific angiography codes apply in your region.
Work with your MAC or billing consultant to identify the correct procedure codes for DSA in your jurisdiction. Cross-reference those codes against conventional angiography codes to confirm your reimbursement rates comply with the NCD 255 ceiling before submitting claims after January 9, 2026.
ICD-10-CM Diagnosis Codes
No ICD-10-CM diagnosis codes are specified in NCD 255. Diagnosis code requirements for DSA claims are governed at the MAC level through local coverage determinations. Check your MAC's LCD for applicable diagnosis codes that support medical necessity for DSA.
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