CMS NCD 327: Wrong Surgical or Other Invasive Procedure — What Medicare's Non-Coverage Policy Means for Your Claims

CMS's National Coverage Determination 327 (NCD 327) addresses one of healthcare's most serious patient safety failures: wrong surgical and invasive procedures performed on Medicare beneficiaries. This policy was modified effective March 12, 2026, and while the core non-coverage position has been in place since CMS last reviewed it in January 2009, billing teams across every surgical specialty need to understand exactly what this NCD covers, what it excludes, and how it should affect your documentation and claims workflows.

What CMS NCD 327 Says About Wrong Procedure Coverage

The Centers for Medicare & Medicaid Services explicitly does not cover any surgical or other invasive procedure performed on a Medicare beneficiary when a practitioner erroneously performs a different procedure than the one indicated for the patient's medical condition. The policy rationale is straightforward: a procedure that isn't the intended treatment for a specific diagnosis cannot meet Medicare's foundational "reasonable and necessary" standard under Section 1862(a)(1)(A) of the Social Security Act.

This NCD sits at the intersection of patient safety policy and claims adjudication. CMS anchors the entire determination to the NQF's "Serious Reportable Events in Healthcare" framework—the so-called "never events" list, which was first published in 2002 and currently contains 28 items. Wrong surgical procedure is explicitly named on that list, and CMS's position is that Medicare simply will not pay for the erroneous procedure itself.

The practical billing implication is significant: if a wrong procedure is performed, the claim for that procedure is non-covered. The correct procedure—once it is actually performed to treat the patient's condition—would be evaluated for coverage under normal Medicare rules.

How CMS Defines a "Wrong Procedure" Under NCD 327

Getting the definition right matters enormously for billing teams, because not every intraoperative change qualifies as a wrong procedure under this policy. CMS defines a wrong surgical or other invasive procedure as one that is not consistent with the correctly documented informed consent for that patient.

That single sentence carries major compliance weight. The informed consent document is the controlling record. If the procedure performed does not match what the patient consented to, the procedure is wrong under this NCD—and the claim is non-covered.

However, CMS carves out three important exceptions where a deviation from the planned procedure is not considered erroneous:

1. Emergent situations during surgery where the urgency of the situation precludes obtaining informed consent.
2. Discovery of pathology in close proximity to the intended site during surgical entry, where the risk of a second surgery outweighs the benefit of consulting the patient first.
3. Discovery of unusual physical configurations—such as adhesions, unexpected spine levels, or extra vertebrae—that necessitate a change in surgical plan.

These exceptions protect clinicians and facilities from non-coverage denials in genuinely unforeseeable clinical circumstances. But they are narrow, and documentation supporting any of these exceptions must be in the operative record.

Which Procedures Fall Under This NCD's Scope

CMS casts a wide net on what counts as a "surgical or other invasive procedure" for purposes of NCD 327. The policy includes:

• All procedures described by CPT codes in the Surgery section (CPT 10000–69999 range)
• Percutaneous transluminal angioplasty and cardiac catheterization
• Minimally invasive procedures involving biopsies or placement of probes or catheters requiring entry into a body cavity through a needle or trocar
• Minimally invasive dermatological procedures: biopsy, excision, and deep cryotherapy for malignant lesions
• Extensive procedures including multi-organ transplantation

The policy explicitly excludes examinations using instruments like otoscopes and very minor procedures such as venipuncture for blood draws. If an instrument is introduced through a natural body orifice, or skin, mucous membranes, or connective tissue are incised, the procedure likely falls within scope.

This means the policy touches virtually every surgical specialty that bills Medicare—orthopedics, general surgery, cardiovascular, dermatology, gastroenterology, urology, neurosurgery, transplant, and more.

Benefit Categories Where NCD 327 Applies

This NCD applies across multiple Medicare benefit categories, which means the non-coverage rule isn't limited to inpatient hospital claims. It applies to:

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

Billing teams at ASCs, hospital outpatient departments, physician offices performing in-office procedures, and SNFs all need to be aware of this NCD's reach.

Affected Codes

The policy does not list specific CPT, HCPCS, or ICD-10 codes as covered or non-covered under NCD 327. Instead, CMS applies the non-coverage determination broadly to any CPT surgery-section procedure or invasive procedure (as defined above) that qualifies as a "wrong procedure" under the informed consent standard. Claims processing instructions were issued via Transmittals 1755 and 1764 (Medicare Claims Processing).

Because no specific codes are enumerated in the policy data, billing teams should treat any surgical CPT code submitted on a claim where the documented procedure does not match the patient's informed consent as potentially subject to this NCD's non-coverage determination.

What Your Billing Team Should Do