CMS NCD 329: Wrong-Patient Surgical Procedures Are Never Covered — What Billing Teams Must Know

CMS has modified National Coverage Determination (NCD) 329, which addresses surgical or other invasive procedures performed on the wrong patient. The Centers for Medicare & Medicaid Services (CMS) enforces an unconditional non-coverage rule for these events: if a procedure was intended for a different patient and is not a reasonable and necessary treatment for the Medicare beneficiary who received it, Medicare will not pay — period. With the policy modification effective March 12, 2026, billing and revenue cycle teams need to understand exactly what triggers a non-covered claim and how to protect their organizations from unnecessary write-offs and compliance exposure.

What CMS NCD 329 Covers — and What It Explicitly Does Not

NCD 329 is one of the most categorical coverage determinations in all of Medicare policy. There are no nationally covered indications under this NCD. The entire substance of the determination sits in Section C: nationally non-covered indications.

CMS will not cover a surgical or other invasive procedure when a practitioner erroneously performs a procedure intended for a different patient on a Medicare beneficiary who does not need that procedure. The key legal and clinical standard is "reasonable and necessary" — if the procedure performed is not a reasonable and necessary treatment for that patient's actual medical condition, coverage is denied. This is not a gray-area determination subject to medical review nuance; it is a hard non-coverage rule rooted in the National Quality Forum's (NQF) "never events" framework.

The policy traces directly to the NQF's 2002 landmark report, "Serious Reportable Events in Healthcare: A Consensus Report," which identified 27 serious, largely preventable adverse events. Wrong-patient surgery has remained on the NQF's "never events" list through subsequent revisions, and the list now contains 28 items. CMS aligned its payment policy with this framework to remove any financial incentive — or reimbursement pathway — for these errors.

How CMS Defines "Wrong Patient" for Billing Purposes

The definition matters enormously for billing teams, because it establishes the documentation standard that determines whether a claim is payable.

CMS considers a procedure to have been performed on the wrong patient when it is not consistent with the correctly documented informed consent for that patient. This is the operational test. If the procedure billed does not match the informed consent on file for the specific patient who received it, the claim is non-covered under NCD 329 — regardless of what was intended or why the error occurred.

This documentation-based definition has direct implications for how your team handles claim submission, medical record review, and any post-payment audit response. The informed consent document is not merely a clinical formality; under this NCD, it is the coverage-determinative record.

Which Procedures Fall Under CMS NCD 329

The scope of NCD 329 is deliberately broad. CMS defines surgical and other invasive procedures as operative procedures in which:

• Skin or mucous membranes and connective tissue are incised, or
• An instrument is introduced through a natural body orifice

The policy explicitly includes all procedures described by codes in the surgery section of the CPT code set, plus other invasive procedures such as percutaneous transluminal angioplasty and cardiac catheterization. Minimally invasive procedures — including biopsies and placement of probes or catheters requiring entry into a body cavity through a needle or trocar — are also covered by this definition.

The scope extends from minimally invasive dermatological procedures (biopsy, excision, and deep cryotherapy for malignant lesions) all the way to multi-organ transplantation. That range means this NCD touches virtually every surgical specialty billing Medicare.

What is explicitly excluded from the definition: instruments used for examination only (such as otoscopes) and very minor procedures such as drawing blood. Those do not trigger NCD 329 non-coverage review.

Medicare Benefit Categories Affected

NCD 329 applies across nearly every Medicare benefit category where a surgical procedure could be billed. The policy lists the following applicable categories:

• Diagnostic Tests (other)
• Federally Qualified Health Center Services
• Home Health Services
• Incident to a Physician's Professional Service
• Inpatient Hospital Services
• Outpatient Hospital Services Incident to a Physician's Service
• Physicians' Services
• Rural Health Clinic Services
• Skilled Nursing Facility

This cross-category reach means the policy is relevant whether your organization is billing Part A inpatient claims, Part B professional fees, or outpatient facility charges. RCM directors overseeing multiple billing entities — including FQHCs and RHCs — need to ensure all billing units are aligned on this standard.

Affected Codes

NCD 329 does not list specific CPT, HCPCS, or ICD-10 codes in the policy document. Instead, CMS applies the non-coverage determination broadly to all CPT codes in the surgery section of the CPT code set, plus any other invasive procedure as defined by the policy's scope. There is no finite code list to filter against — the determination applies based on clinical and documentation circumstances, not a specific code range.

Coverage Status Summary:

Because no specific codes are enumerated, billing teams cannot rely on code-level edits alone to catch NCD 329 exposure. The risk lives in the clinical and documentation layer, not the code itself.

What Your Billing Team Should Do