Summary: The Centers for Medicare & Medicaid Services modified its policy on surgical or other invasive procedures performed on the wrong patient, effective May 15, 2026. Here's what billing teams need to know before that date.
This CMS wrong-patient surgery coverage policy sits in a category most billing teams rarely think about until a claim gets flagged. The Centers for Medicare & Medicaid Services classifies wrong-patient surgical procedures as a "never event" — a serious reportable adverse event that CMS does not cover under Medicare billing guidelines. This policy modification reinforces that position and has direct consequences for how you handle claims, documentation, and reimbursement on any case where a patient identification error is alleged or confirmed.
This policy does not list specific CPT or HCPCS codes. Wrong-patient procedures can involve any surgical or invasive CPT code, which is exactly what makes this coverage policy so operationally broad.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS / Medicare |
| Policy | Surgical or Other Invasive Procedure Performed on the Wrong Patient |
| Policy Code | N/A |
| Change Type | Modified |
| Effective Date | May 15, 2026 |
| Impact Level | High |
| Specialties Affected | All surgical specialties, procedural medicine, interventional radiology, endoscopy, anesthesiology |
| Key Action | Audit your patient identification protocols and claims handling procedures before May 15, 2026 — any procedure flagged as wrong-patient is non-covered and may trigger a no-pay event |
CMS Wrong-Patient Surgery Coverage Criteria and Medical Necessity Requirements 2026
CMS's position here is unambiguous: a surgical or invasive procedure performed on the wrong patient does not meet medical necessity — by definition. The procedure was never indicated for that patient. There is no documentation, diagnosis code, or prior authorization path that makes it billable to Medicare.
This falls under CMS's "never event" framework, which the agency has enforced since the 2008 inpatient prospective payment system final rule. CMS does not reimburse hospitals or physicians for the costs of care associated with serious preventable adverse events, including wrong-patient surgery. That policy has been clear for years.
What this 2026 modification signals is that CMS is updating or tightening the language around how these cases are handled administratively. Whether that means new documentation requirements, updated claims adjustment procedures, or revised reporting obligations, billing teams need to treat the effective date of May 15, 2026, as a hard deadline for reviewing internal workflows.
Any claim submitted for a procedure later identified as performed on the wrong patient is subject to denial, recovery, and potential False Claims Act exposure if billed knowingly. If you're not sure how this applies to your facility's current workflows, talk to your compliance officer before May 15, 2026.
CMS Wrong-Patient Procedure Exclusions and Non-Covered Indications
The entire category here is non-covered. There is no covered indication for a surgical or invasive procedure performed on the wrong patient. CMS treats this as a condition-of-coverage failure, not a medical necessity determination.
That distinction matters for billing. A medical necessity denial says the service wasn't appropriate for this patient's condition. A never-event non-coverage determination says the service should never have happened at all — and CMS will not pay for it, period.
Under Medicare billing guidelines, facilities must adjust any claim for a wrong-patient procedure. The adjustment should remove charges tied directly to the error. Secondary procedures to correct the harm — treatment of the wrong patient for injuries caused by the procedure — may also fall into non-covered territory depending on how CMS defines the scope of the never event.
Prior authorization does not rescue a wrong-patient claim. Even if a procedure was pre-authorized, authorization is granted for the correct patient. A wrong-patient event voids the coverage basis entirely.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Surgical procedure performed on the correct, intended patient | Covered (standard criteria apply) | Applicable CPT per procedure | Normal medical necessity, documentation, and prior authorization rules apply |
| Surgical procedure performed on the wrong patient | Not Covered | Any surgical CPT code | Never event — CMS will not reimburse; claim must be adjusted |
| Invasive procedure (non-surgical) performed on the wrong patient | Not Covered | Any invasive procedure CPT code | Same never-event framework applies |
| Corrective treatment for the wrong patient after the error | Not Covered (likely) | Applicable treatment CPT codes | Costs associated with correcting a never event are non-reimbursable under CMS policy; confirm with your compliance officer |
| Anesthesia administered as part of a wrong-patient procedure | Not Covered | Applicable anesthesia CPT codes | Anesthesia is part of the procedure; if the procedure is non-covered, associated anesthesia billing is also at risk |
This policy does not specify individual CPT codes. Apply non-coverage status to any surgical or invasive CPT code when a wrong-patient determination has been made.
CMS Wrong-Patient Surgery Billing Guidelines and Action Items 2026
The real issue here isn't whether these cases should be covered — they shouldn't, and they won't be. The issue is whether your billing team has a clear, documented protocol for handling these claims when they surface. Most facilities don't. Here's what to do before May 15, 2026.
| # | Action Item |
|---|---|
| 1 | Audit your claims adjustment workflow right now. Identify who in your revenue cycle is responsible for flagging and adjusting a claim when a wrong-patient event is reported. If that process isn't written down, write it down before the effective date. |
| 2 | Coordinate with your compliance officer and risk management team. Wrong-patient events are reportable under The Joint Commission's sentinel event framework and may trigger state reporting requirements. Claims decisions should not happen in a billing vacuum — your compliance officer needs to be in the loop before you adjust or write off any charges. |
| 3 | Do not bill Medicare for the wrong-patient procedure. If the event is confirmed before the claim goes out, pull it. Do not submit a claim and wait for a denial. Submitting a known non-covered service creates False Claims Act exposure. This is not a technicality — it's a legal risk. |
| 4 | Review what happens to the correct patient's encounter. If the wrong patient was treated, a correct patient was likely missed or delayed. That encounter needs its own documentation review. The correct patient's procedure — when eventually performed — is billable under standard coverage policy rules, but the records need to be clean and clearly separated from the error event. |
| 5 | Check your patient identification protocol against Joint Commission and CMS requirements. Two-patient identifiers before every invasive procedure is the standard. If your facility isn't consistently using two identifiers, that's a claim denial risk and a patient safety risk. Fix the process, then document that you fixed it. |
| 6 | Train your surgical billing team on the never-event framework. Wrong-patient surgery billing is not a routine denial scenario. The staff handling surgical claims need to know these cases require immediate escalation — not a standard rework queue. |
| 7 | Confirm your ABN process does not apply here. An Advance Beneficiary Notice of Non-Coverage cannot be used to shift liability for a never event to the patient. Do not issue an ABN for a wrong-patient procedure and expect the patient to pay. That approach is wrong legally and ethically. |
| 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 Procedures Under This CMS Policy
Specific Codes Listed in This Policy
This policy does not list specific CPT, HCPCS, or ICD-10 codes. Wrong-patient surgical and invasive procedure billing covers every surgical CPT code in the system — the non-coverage determination applies based on the circumstances of the event, not a discrete code set.
How to Flag These Claims in Practice
When a wrong-patient event occurs, your billing team will typically be working with whatever CPT codes were submitted or prepared for the procedure itself. The non-coverage determination applies to that code set in context — not because of what the code is, but because of who received the service.
Document the event thoroughly in the medical record. Use your internal event-reporting system. Then work with your compliance officer to determine whether an ICD-10-CM code for an adverse event or misadventure is appropriate on the record. ICD-10-CM includes codes in the Y65.xx range for misadventures during surgical and medical care — but code assignment in these cases should involve your compliance officer and coding leadership, not routine charge capture staff.
ICD-10-CM Context (Not From Policy Data — Clinical Reference Only)
Note: The following is provided as clinical context only. These codes do not appear in the CMS policy document, which lists no codes.
The ICD-10-CM Y65.52 code — "Performance of wrong procedure on correct patient" — and related misadventure codes in the Y65 category are commonly cited in wrong-patient event documentation. Your coding team and compliance officer should determine whether and how these codes apply to your specific event record. Do not add these codes to a claim without compliance review.
Get the Full Picture
Track this policy across versions, search 1,500+ policies by CPT code, and get real-time alerts when any payer changes coverage.