TL;DR: The Centers for Medicare & Medicaid Services modified NCD 329, the national coverage determination governing wrong-patient surgical procedures, with an effective date of January 9, 2026. CMS will not reimburse any surgical or invasive procedure performed on a Medicare beneficiary who did not need it — and your billing team needs to understand exactly what triggers that denial.
This policy doesn't list specific CPT codes because it applies to the entire surgery section of CPT — every operative and invasive procedure code is in scope. The wrong-patient surgical procedure coverage policy is one of the few NCDs with zero gray area: either the procedure matches documented informed consent or the claim fails.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS |
| Policy | Surgical or Other Invasive Procedure Performed on the Wrong Patient |
| Policy Code | NCD 329 |
| Change Type | Modified |
| Effective Date | 2026-01-09 |
| Impact Level | High |
| Specialties Affected | All surgical specialties, interventional cardiology, radiology, dermatology, transplant surgery, any provider performing invasive procedures across inpatient hospital, outpatient hospital, SNF, home health, FQHC, and rural health clinic settings |
| Key Action | Audit your informed consent documentation workflow before January 9, 2026 — any procedure not consistent with documented patient consent is a non-covered claim |
CMS Wrong-Patient Surgical Procedure Coverage Criteria and Medical Necessity Requirements 2026
NCD 329 in the CMS Medicare system exists for a simple reason: wrong-patient surgeries are never medically necessary. That's not an opinion — it's the foundation of this coverage policy.
CMS defines the non-coverage trigger clearly. A surgical or other invasive procedure is not covered when a practitioner "erroneously performs a procedure that was intended for a different patient on a Medicare beneficiary who does not need that procedure." The operative phrase is "does not need." If the procedure isn't a reasonable and necessary treatment for that patient's specific condition, reimbursement is off the table.
The second trigger is equally clear. A procedure counts as performed on the wrong patient when it "is not consistent with the correctly documented informed consent for that patient." This is where your billing team's exposure lives. The clinical error creates the billing consequence — and the documentation of consent is the paper trail that either confirms or contradicts the procedure performed.
Medical necessity under NCD 329 isn't about clinical complexity. It's about identity and intent. The question isn't whether the procedure was performed correctly — it's whether it was performed on the right person for the right documented reason.
This coverage policy applies across a wide range of benefit categories. Inpatient hospital services, outpatient hospital services, physicians' services, skilled nursing facility services, home health services, FQHC services, rural health clinic services, and services incident to a physician's professional service are all in scope. If you bill Medicare across any of these settings and your facility performs surgical or invasive procedures, NCD 329 applies to you.
Prior authorization is not a factor here — there's no prior authorization process that fixes a wrong-patient error after the fact. The non-coverage determination is absolute once CMS establishes that a procedure was performed on the wrong patient.
CMS Wrong-Patient Procedure Exclusions and Non-Covered Indications
The non-covered indication under NCD 329 is straightforward, but the scope of what counts as a "surgical or other invasive procedure" is broader than most billing teams assume.
CMS covers all procedures in the surgery section of CPT. It also covers other invasive procedures that fall outside the surgery CPT section — percutaneous transluminal angioplasty, cardiac catheterization, biopsies, placement of probes or catheters via needle or trocar. If it enters a body cavity, an orifice, or breaks skin or mucous membranes, it's in scope.
Minimally invasive dermatological procedures are explicitly included — biopsies, excisions, and deep cryotherapy for malignant lesions all qualify. So does multi-organ transplantation on the other end of the spectrum. The policy draws a hard line at two categories: instruments used for examination only (like otoscopes) and very minor procedures like drawing blood. Everything else is potentially subject to NCD 329.
The practical implication: wrong-patient billing exposure is not limited to the OR. Your interventional radiology suite, your cath lab, your dermatology practice — all of these settings perform procedures that fall under this policy.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Procedure performed on the correct patient, consistent with documented informed consent | Covered (subject to all other applicable coverage criteria) | All applicable CPT surgery section codes and other invasive procedure codes | Standard medical necessity and coverage rules apply for the underlying procedure |
| Procedure performed on a Medicare beneficiary who did not need it, intended for a different patient | Not Covered | All CPT surgery section codes and other invasive procedure codes | Non-coverage is absolute — no appeal pathway based on clinical quality of the procedure itself |
| Procedure not consistent with correctly documented informed consent for that patient | Not Covered | All CPT surgery section codes and other invasive procedure codes | Informed consent documentation is the dispositive record |
| Examination using instruments without incision or body cavity entry (e.g., otoscope) | Outside Scope of NCD 329 | Not applicable | These are not defined as invasive procedures under this policy |
| Blood draw or similarly minor procedures | Outside Scope of NCD 329 | Not applicable | Explicitly excluded from the definition of invasive procedure |
CMS Wrong-Patient Surgical Procedure Billing Guidelines and Action Items 2026
This is where wrong-patient surgical procedure billing gets operational. The policy itself is clear — the exposure is in your documentation and workflow processes.
| # | Action Item |
|---|---|
| 1 | Audit your informed consent documentation workflow before January 9, 2026. Every invasive procedure billed to Medicare needs a consent document that matches the procedure performed. If your facility uses pre-printed consent forms or template-based EHR consents, confirm that the specific procedure name on the consent matches the CPT code on the claim. Mismatches are the core mechanism that triggers non-coverage under NCD 329. |
| 2 | Train your OR schedulers and pre-op teams on patient identity verification protocols now. The NQF "never events" framework — which is the explicit foundation of this policy — treats wrong-patient procedures as preventable. Your billing team can flag documentation gaps, but the real prevention happens before the patient is on the table. Billing and clinical operations need to be aligned on this. |
| 3 | Review your charge capture process for invasive procedures in non-OR settings. This policy covers cath labs, interventional radiology, dermatology, and any setting where probes, catheters, biopsies, or trocar-based procedures occur. Update your charge capture workflow to include a consent verification checkpoint for all procedures in these settings — not just surgical suites. |
| 4 | Establish a claim denial response protocol specific to NCD 329. If a claim comes back denied under this policy, your billing team needs to know immediately whether the denial reflects a coding error, a documentation gap, or an actual clinical event. A wrong-patient event triggers mandatory reporting obligations that go well beyond the billing department. Loop in your compliance officer the moment you see a denial that references a wrong-patient determination. |
| 5 | Pull and review any pending claims for invasive procedures where consent documentation is incomplete or mismatched. Don't wait for the denial. Audit your claims queue now and identify any procedure where the consent form isn't procedure-specific and patient-specific. Hold those claims until documentation is corrected or confirmed, rather than submitting and managing the denial downstream. |
| 6 | Confirm your facility's serious reportable event (SRE) reporting process is current. NCD 329 is built on the NQF serious reportable events framework. CMS modified this policy in 2026 in that context. If your facility hasn't reviewed its SRE reporting obligations recently, this is the right moment. Your compliance officer should own this review — billing teams shouldn't be working this issue in isolation. |
If you're unsure how this policy applies to your specific procedure mix or facility type, talk to your compliance officer before January 9, 2026. The intersection of billing non-coverage, mandatory event reporting, and potential fraud exposure makes this a policy where getting it right matters more than getting it fast.
| 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 Wrong-Patient Surgical Procedures Under NCD 329
Code Scope Under NCD 329
NCD 329 does not list specific CPT or HCPCS codes. This is intentional — the policy applies to the entire surgery section of the Current Procedural Terminology, plus all other invasive procedures outside the surgery section.
| Code Category | Scope | Notes |
|---|---|---|
| All CPT Surgery Section Codes | Subject to NCD 329 | Every operative procedure in the CPT surgery section is in scope — no exclusions by code range |
| Other Invasive Procedures (non-surgery CPT section) | Subject to NCD 329 | Includes percutaneous transluminal angioplasty, cardiac catheterization, biopsy, probe/catheter placement via needle or trocar |
| Minimally Invasive Dermatological Procedures | Subject to NCD 329 | Explicitly includes biopsy, excision, deep cryotherapy for malignant lesions |
| Examination-only instruments (e.g., otoscopes) | Not Subject to NCD 329 | Instruments used only for examination, no incision or cavity entry |
| Blood draw and similarly minor procedures | Not Subject to NCD 329 | Explicitly excluded from the policy's definition of invasive procedure |
A Note on Code-Specific Billing
Because this policy applies across CPT categories rather than to specific codes, your billing team can't create a simple code-level edit to flag exposure. The risk management has to happen at the documentation and workflow level — consent verification, patient identity confirmation, and procedure-specific documentation before the claim is submitted.
If your MAC publishes a local coverage determination that adds specificity to NCD 329 for your region, that LCD would narrow the focus. Check with your Medicare Administrative Contractor for any regional guidance layered on top of this NCD.
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