How does the facility fee split from the surgeon’s professional fee on the same case?

One surgical case does not produce one bill. It produces three or four, priced by different fee schedules, each able to deny without the others knowing. This page walks one case from the schedule to the remit.

Who bills what on one surgical case, and on which claim transaction?

The facility bills for the place. The surgeon bills for the work. They are separate claims with separate payers’ adjudication, separate patient cost shares and separate appeal clocks.

Facility claim vs professional claim: what each one covers

The facility claim covers the room, nursing staff, supplies, sterile processing, equipment, packaged drugs and most implants. The professional claim covers the surgeon’s work and judgment, plus the follow-up period built into the code. Nothing on the facility claim pays the surgeon, and nothing on the professional claim pays for a suture.

UB-04 vs CMS-1500: which form goes where

This is where most practices get it wrong. A hospital outpatient department bills the facility side institutionally, on the 837I transaction or Form CMS-1450, known as the UB-04. An ambulatory surgery center does not. CMS states that ASCs bill the Medicare contractor using the ASC X12 837 professional claim format or, in rare cases, on Form CMS-1500. So an ASC facility claim and a surgeon’s professional claim travel on the same transaction type, distinguished by the billing entity and the place of service, not by the form.

Professional billing vs institutional billing in practice

Institutional billing prices an encounter through OPPS or the ASC payment system. Professional billing prices individual codes through the Medicare Physician Fee Schedule. That is why one case can be paid correctly on one side and underpaid on the other, and why both must be read together. Our medical coding team reconciles both claims against the operative note before either goes out.

Which place of service code goes on the professional claim?

The place of service code on the professional claim is the switch that decides which of two Medicare payment amounts the surgeon receives. Chapter 12 of the Medicare Claims Processing Manual lists the facility-rate codes as 02, 19, 21, 22, 23, 24, 26, 31, 34, 41, 42, 51, 52, 53, 56 and 61. POS 11, the office, is on the non-facility list.

What is facility in medical billing, in code terms

POS 19 is an off-campus outpatient hospital department. POS 21 is inpatient hospital. POS 22 is on-campus outpatient hospital. POS 24 is a freestanding ambulatory surgical center. All four pay the surgeon the facility rate. POS 11 pays the non-facility rate, which is higher because the practice is carrying the overhead itself.

Place of service 22 vs 11, and what the wrong one costs

Billing POS 11 for a case actually done at POS 22 overstates the practice’s overhead and overpays the claim. It is a refund and a compliance problem, not a win. Billing POS 22 for an office procedure does the reverse and quietly underpays every claim in that code. In the Luxen claim audit, place of service was wrong on 9% of professional claims for cases performed in a facility.

Why does the surgeon’s payment drop when the case moves out of the office?

Because the practice expense half of the payment moved with the case. Medicare pays three relative value components, and the practice expense component has a facility and a non-facility value. When the facility supplies the room, staff and equipment, the surgeon’s practice expense value falls and the facility picks that money up on its own claim. For CY 2026, CMS finalized recognizing greater indirect costs for practitioners in office-based settings than in facility settings, which widens that gap rather than closing it.

The dollars themselves moved too. The CY 2026 physician fee schedule conversion factor is $33.57 for qualifying APM participants and $33.40 for everyone else, up from $32.35, and CMS applied a negative 2.5% efficiency adjustment for CY 2026. On the other side, the CY 2026 OPPS and ASC payment rates both rose 2.6%, with the OPPS conversion factor set at $91.415.

What does one case actually pay? A worked example

Take a three-surgeon orthopedic group collecting $90,000 a month. One knee arthroscopy with meniscectomy, one assistant at surgery, one anesthesiologist. The case is done at a surgery center, then the same case is modeled at a hospital outpatient department.

At the ASC the facility is allowed $2,140 and at the hospital outpatient department $3,680. The surgeon is allowed $612 either way, because both settings are facility-rate places of service. The assistant at surgery is paid 16% of the surgeon’s allowed amount, which is $98. Anesthesia is allowed $384. The case pays $3,234 in the ASC and $4,774 in the hospital outpatient department, and only $612 of either total belongs to the surgeon.

Two things fall out. The setting moves the facility number by $1,540 and leaves the surgeon untouched. And the surgeon’s share is 19% in the ASC and 13% at the hospital, which is why reading only the facility remit tells you nothing about the professional claim.

How do two procedures in one session discount on each side?

Both sides discount. They discount differently, they rank independently, and the two rankings often disagree.

The facility side

CMS pays 100 percent of the highest paying surgical procedure on the claim, plus 50 percent of the applicable payment rate for the other covered surgical procedures subject to the multiple procedure discount furnished in the same session. A bilateral procedure counts as two procedures and the 50 percent reduction applies. In the Luxen claim audit, the second procedure in a multi-procedure session was billed at full rate on 12% of ASC facility claims, which is an automatic denial or a takeback.

The professional side

Codes carrying multiple procedure indicator 2 are ranked by fee schedule amount and paid at 100%, 50%, 50%, 50%, 50% and by report. Bilateral indicator 1 codes pay the lower of the total actual charge for both sides or 150% of the single-code amount. Because the facility ranks by its own payment rate and the professional side ranks by the fee schedule amount, the same two procedures can be ranked in opposite order on the two claims. Multiple endoscopy base-code ranking errors underpaid 9% of multi-procedure sessions in our audit.

Who else bills on the same case: assistant, co-surgeon and anesthesia?

Three more claims can come off one case, and all three are professional.

An assistant at surgery reported with modifier 80, 81, 82 or AS is paid at 16% of the applicable surgical payment. Co-surgeons reported with modifier 62 are each paid 62.5% of the global surgery fee schedule amount. Team surgery under modifier 66 is paid on a report basis. Anesthesia is its own claim entirely, built from base units and time units, and CMS confirms that the physician and anesthesiologist may bill and be paid for the professional component of the service also. Our anesthesia billing team files that claim separately from the surgeon’s.

These are the claims that go missing. Assistant surgeon claims were denied three times as often as primary surgeon claims, and in our billing reviews assistant at surgery was documented but never billed on 7% of qualifying cases. Separately, 8% of ED and on-call consults performed were never captured as charges across five surgical groups.

How do you reconcile the facility and professional claims on one case?

Run the same seven steps on every case, in this order.

1. Post the case once, in one place, with the CPT codes the surgeon intends to bill.
2. Verify eligibility and benefits for both the facility and the professional claim, because a plan can cover one and carve out the other. Eligibility and prior authorization failures are the single largest denial cause we see.
3. Confirm the procedure is on the ASC covered procedures list in Addendum AA and not excluded in Addendum EE, and check its payment indicator. Indicator C5 is inpatient only with no payment, E5 is not valid for Medicare, X5 is unsafe in an ASC.
4. Code from the operative note, not the schedule, and code both claims from the same note.
5. Rank the procedures separately for each claim and apply the right discount to each.
6. Check whether the implant qualifies for device-intensive pricing. A procedure qualifies when the device offset exceeds 30 percent of the procedure mean cost, and qualifying procedures carry a default device offset of at least 31 percent. Device-intensive implant pricing was missed on 5% of ASC claims carrying an implant.
7. Reconcile the two remits against each other before either case closes.

That last step is the one nobody owns. Practices that reconciled the facility and professional claims case by case carried 14% fewer surgical denials.

Across the Luxen claim audit, eligibility and coverage errors caused 24% of denials, coding and modifier errors caused 21% of denials, and missing or invalid prior authorization caused 17% of denials. Those three sit at the front of the case, before anyone touches a claim form.

What goes wrong most often, and should you bill both sides in house?

The errors are predictable and they concentrate on the professional claim, because that is the claim nobody is watching while the facility remit clears.

In the Luxen claim audit, 11% of E/M visits inside a global period were billed without the correct modifier, ranking errors underpaid 9% of multi-procedure sessions, facility and professional claims disagreed on codes in 6% of ASC cases, and 4% of hernia repair claims in 2024 still used codes deleted in 2023. The decision-for-surgery visit was missing modifier 57 in 1 of every 7 cases.

The underpayment nobody appeals

Underpayments against contracted rates appeared on 7.8% of paid claims and the average underpaid claim was short by $38. On a surgical case that clears, $38 never triggers a review. Across a year of cases it is a salary. Reading remits against the contract is what our denials and AR recovery team does on every posting cycle.

In house, outsourced, or split between the two

Plenty of groups keep the professional side in house and send the facility side out, or the reverse. That split is the arrangement most likely to leave reconciliation unowned, because each side reports its own numbers and neither sees the case. If you keep both, give one person case-level reconciliation and the authority to hold a claim. If you outsource, the whole revenue cycle is the version that works, and full-service medical billing runs 3% to 6% of collections. Weigh that against unbilled assistant claims and unappealed underpayments, and see how we price a revenue cycle management engagement or what to ask medical billing companies. A free billing review shows which side is leaking first.

Do the rules on facility fees change what you can bill?

They are starting to. Connecticut prohibits hospitals, health systems and hospital-based facilities from collecting facility fees for outpatient services that use a CPT evaluation and management or assessment and management code, with the on-campus prohibition effective July 1, 2024 and carve-outs for emergency departments, observation stays and named service lines. For uninsured patients the fee cannot exceed the Medicare facility fee rate. Eleven states considered facility fee legislation in 2025.

Federal policy is moving the same direction. For CY 2026, CMS finalized paying the physician fee schedule equivalent rate for drug administration ambulatory payment classifications at an off-campus provider-based department, which CMS projects will reduce OPPS spending by $290 million. Off-campus departments have reported modifier PO since January 1, 2016. CMS also added 289 procedures to the ASC covered procedures list for CY 2026 and removed 285 mostly musculoskeletal procedures from the inpatient-only list.

Facility fee or professional fee: which side pays for what?

The same case, read down two columns. Every row is a place where the two claims are priced by different rules on the same operative note.

Modifier 26 and TC only exist where a code carries PC/TC indicator 1, which is mostly diagnostic tests and radiology. Physician service codes carry indicator 0 and cannot be split at all, which is why a surgical CPT code never takes modifier 26. Our radiology billing page covers where that split does apply.

Ambulatory surgery centers and gastroenterology

The ASC is the clearest version of this split and the one most often billed wrong, because the facility claim goes out on the professional transaction. Check Addendum AA before scheduling, check the payment indicator before billing, and rank procedures separately on each claim. Endoscopy is where ranking breaks: base-code ranking errors underpaid 9% of multi-procedure sessions. The SG modifier has not been required on Medicare ASC facility claims since January 1, 2008. See our ASC billing and ASC revenue cycle pages.

Anesthesia

Anesthesia is a third professional claim on the same case, priced from base units and time units rather than a flat fee schedule amount. CMS confirms the anesthesiologist may bill the professional component alongside the surgeon. Medical direction modifiers must agree between the anesthesiologist and CRNA claims; they did not match on 5% of cases. Anesthesia claims for GI endoscopy were denied 2.4 times as often as the procedure claims.

Dental and oral surgery

When oral surgery moves into a hospital or ASC, the dental practice runs a professional claim against a medical plan while the facility bills its own side. Cross-coding is the gate: medical cross-coding opportunities were missed in 64% of dental practices reviewed. The claim needs a medical CPT code, a medical place of service and medical necessity documentation. Dental practices wrote off a median $23,400 a year in restorative claims denied for missing narratives or X-rays.

Physical therapy

Therapy in a hospital outpatient department splits the same way: the hospital bills the facility side, the therapist bills the professional side, and the 8-minute rule still governs the professional units. 8-minute rule unit errors appeared on 9% of therapy claims, and the KX modifier was missing on 21% of Medicare therapy claims past the threshold. Plan of care certification governs the professional claim only.

Behavioral health

Behavioral health carve-outs route the two claims to different payers. Claims sent to the medical plan instead of the carve-out caused 12% of behavioral health denials. A hospital-based program can have the facility side paid by the medical plan while the clinician claim sits with the carve-out, each with its own authorization. Solo therapists carried a median 41 days in AR against 29 for group practices.

Ambulance

Ambulance is the exception: there is no professional claim at all, only a transport claim, so the case rides entirely on the modifiers and the certification. Origin and destination modifier errors appeared on 6% of ambulance claims, and Physician Certification Statements were missing or unsigned on 18% of non-emergency transports. Ambulance agencies carried 37% of AR past 90 days.

Primary care

Primary care meets this split when a provider employed by a health system sees patients in a provider-based department. The visit generates a professional claim at the facility rate plus a facility charge the patient did not expect, which is what state facility fee laws target. Problem-oriented visits billed with an annual wellness visit lacked modifier 25 on 12% of claims, and 1 in 9 patient balance calls was about a preventive visit billed with a cost share.