ASC Revenue Cycle Management: Where Surgery Centers Lose the Facility Fee

Most specialties bill an encounter. A surgery center bills a case, and the case is one packaged facility payment that either arrives whole or does not arrive. Under 42 CFR 416.164 that payment absorbs nursing and technician services, the room, equipment, dressings, splints and casts, non pass-through supplies, drugs and implanted devices, and the materials and supervision of anesthesia administration. The surgeon, the anesthesia provider and the pathologist bill separately; the claim-side mechanics sit on our ASC billing services page. Packaging is what makes this unforgiving: there is no partial credit for the parts of a case documented correctly.

The case, not the visit, is the unit of revenue

A clinic that loses a charge loses a charge. A center that cannot close a case loses the room, the staff, the implant and the anesthesia coordination with it, and that cost was already spent. Which is why days not final billed matters more here than days in AR.

The payment list moves every quarter

Under 42 CFR 416.173 CMS republishes the covered procedures, the covered ancillary services and the rates annually, with addenda refreshed quarterly. For CY2026 the criteria themselves changed: five general exclusion criteria came out of 42 CFR 416.166 and became physician considerations for patient safety. A center whose contracts were written against the pre-2026 list is now booking cases it is not paid properly for. Volume then multiplies one error: an eye center running 30 cataract cases a day repeats its modifier template 30 times before anyone reads a remittance.

Surgery centers divide by who owns the contracts and who carries the AR, not by size. That decides where the revenue cycle breaks.

Physician-owned single-specialty centers

Ophthalmology, gastroenterology, orthopedic, pain and ENT centers. Narrow code set, dense schedule, concentration risk: one modifier habit, one payer, one rate line.

Physician-owned multispecialty centers

Four to eight service lines sharing two or three rooms, each with its own documentation path and payer rules. Charge capture, not coding, is the failure point. Centers wanting surgeon and anesthesia claims alongside the facility claim use our full-service medical billing team.

Hospital joint ventures

The hospital contributes contracts written for its outpatient department, and the center inherits terms never modeled against ASC economics.

Management-company operated and de novo centers

Central contracting with local case management, where the question is whether center-level AR reaches people who can act on it. At a new center, contracts and enrollments are still being built while cases are performed, so first-year held revenue is a credentialing problem.

Out-of-network and hybrid centers

Part of the schedule is billed outside a contract, which changes estimates, patient balances and appeals for those cases.

Competing pages describe leakage in prose. Nobody tabulates it. Each leak is organised by cause, with annual exposure modeled for a center running 3,200 cases a year at about $750 of net facility revenue per case. Aged balances go to our denials and AR recovery team.

Six competing pages name key performance indicators. None publishes a target. The Typical column is federal data only; where no federal file publishes a figure the cell says so. Target is Luxen client data. The CERT FY2025 report put the Medicare Part B improper payment rate at 8.4%, or $9.6 billion, and ASCs are not broken out in it.

Authorization is where a surgery center loses whole cases rather than line items, because an ASC approval is specific in three dimensions: procedure, site of service and date. Change one and a payer can treat the service as unauthorised, even though it approved the same operation weeks earlier.

Why rescheduling is the expensive failure

Centers move cases constantly, and each move opens a gap between the approval on file and the case performed. The authorization on file named a date, site or procedure code that did not match the case performed on 11% of ASC cases requiring prior authorization, across 3,900 ASC facility claims (Luxen claim audit). We bind approvals to the performed date and re-verify before the case, not after the denial.

Verification of benefits is not eligibility

Eligibility confirms coverage exists. Verification of benefits confirms the facility benefit, deductible position, coordination of benefits and whether the plan treats this site as in network. Eligibility was verified once at scheduling and not re-checked before the date of service at 14 of 23 surgery centers reviewed (Luxen billing reviews), so a plan change between booking and surgery is found on a remittance.

Medicare does require it for some ASC services

Medicare has no blanket ASC prior authorization requirement, which is why centers assume there is none. The exception is targeted: a CMS demonstration covers a named set of ASC services in some states, and a claim that bypasses it lands in prepayment medical review instead. Centers in Florida, Texas and New York sit inside that footprint. Our eligibility and prior authorization team files the requests and tracks each decision to the case.

Utilization review and concurrent review

Commercial plans apply medical policy to elective surgery: conservative care duration, imaging findings, documented failure of non-surgical treatment. When a plan declines, the recoverable path is a peer to peer conversation inside the appeal window, not a resubmission. Concurrent review matters where recovery is extended and the plan reassesses while the patient is on site. Appeals filed by Luxen were overturned 68% of the time, with a median appeal turnaround of 34 days from filing to payer decision (Luxen client data).

The signature revenue mechanic of a surgery center is the gap between what a case costs to perform and what the packaged facility fee pays for it. Other specialties manage charges. A center manages margin per slot, and the revenue cycle either protects it or gives it away.

What the facility fee already includes

Under 42 CFR 416.164 the payment covers the room, nursing and technician services, equipment, dressings, splints and casts, drugs and supplies without separate payment status, implanted devices not on pass-through status, and the materials and supervision of anesthesia administration. Separately payable items are narrow: brachytherapy sources, certain pass-through implantable items, corneal tissue acquisition, certain separately paid drugs and radiology, and certain non-opioid pain management items.

Device-intensive cases carry the margin

A procedure whose device offset exceeds 30% of procedure cost is device-intensive, and the device portion dominates payment. When the device arrives free or with a credit the claim must say so: a device furnished without cost or with full credit reduces payment by the entire device offset, and a partial credit of 50% or more reduces it by half that amount, under 42 CFR 416.179. Coinsurance recalculates on the reduced amount, both modifiers on one line is not permitted, and a pass-through device takes neither.

Ranking decides the second half of the case

On a multiple procedure case Medicare pays 100% of the highest rate and 50% of the others under 42 CFR 416.171. Ranking is arithmetic, not judgement, and it runs against the current rate file. Multiple procedure ranking errors underpaid 7% of multi-procedure ASC sessions, across 3,900 ASC facility claims (Luxen claim audit). A discontinued case under modifier 73 and a reduced-services case under modifier 52 are both exempt from the further reduction, which is where expected payment is most often mis-modeled.

Office-based procedures are capped

For procedures CMS designates as commonly performed in physicians' offices, the ASC rate is the lesser of the standard ASC amount or the non-facility practice expense amount under the physician fee schedule. Booking those into a room without checking the cap fills a slot at a loss. Our certified medical coders check every case before submission.

Medicare sets the reference price. Commercial contracts set the margin, and almost every ASC contract is a percentage of the Medicare ASC rate for a defined list of procedures. When the list changes, the contract does not.

What CY2026 did to every contract signed before it

The CY2026 final rule added 289 procedures to the covered procedures list under revised eligibility criteria and a further 271 codes that came off the inpatient only list, and began a three-year phase-out of that list with 285 mostly musculoskeletal procedures. Total ASC payments were projected at roughly $9.2 billion for the year, about $450 million above CY2025, on a 2.6% update. A joint or spine case that is newly payable in a center may still be carved out, silent or priced at a stale rate in a contract drafted two years ago. The CY2027 proposed rule would remove 638 more services from the inpatient only list. Separately, a center that misses ASC Quality Reporting deadlines loses 2.0 percentage points of its annual update under 42 CFR 416.172, applied to every Medicare case for the year.

Underpayment is a posting problem first

A short payment looks identical to a correct one on a remittance unless something compares it to the contracted rate. Commercial ASC claims paid below the contracted rate on 9% of paid facility claims, across 3,900 ASC facility claims (Luxen claim audit). We load contract terms into the rate table, compare every commercial remittance against them and file the variance as a project rather than one claim at a time.

What to renegotiate and when

Bring case-level cost data, not a rate request. The defensible arguments are implant cost inflation on device-intensive cases, the site-of-service saving the plan realises against its hospital outpatient rate, and volume the center can move. Carve-outs for implants above a stated invoice threshold are easier to win than a percentage increase. Rates vary by state and payer mix; see our medical billing company comparison.

Days not final billed is the number to read before days in AR, because an unbilled case is not in AR at all. It is invisible in every report that starts at the claim, which is why it grows.

Why cases stall

A billable case needs four artifacts to exist and agree: operative note, anesthesia record, implant log and supply sheet. They come from four people, in as many as three systems, on different timelines. Surgery centers reviewed carried a median 6.8 days not final billed, and the slowest quartile carried 14 days or more, across 23 surgery centers (Luxen billing reviews). The pattern is rarely missing documentation. Nobody is accountable for the case being complete, and the gap is widest where the operating room and billing report to different people.

The ownership problem, measured

42% of practice managers said nobody owns denial follow-up full time, and practice managers estimated 11 staff hours a week on insurance calls and portal checks (Luxen Practice Manager Survey 2026). In a center that unowned time sits between the operating room and billing, the most expensive place for it to sit, because nothing downstream can start until the case closes.

What fixes it, and what it is worth

One queue, one owner, one daily review, and an ageing report for unbilled cases that looks exactly like the one for unpaid claims. Cases are chased at day one, not day seven. Practices that reviewed AR ageing monthly carried 12 fewer days in AR (Luxen billing reviews), and the same discipline applied before the claim compresses the front of the cycle further. Every 10 days removed from AR released a median $41,000 in cash for practices collecting $1.5 million to $3 million a year (Luxen billing reviews), and days not final billed sits in front of that number.

Worked for the same center: $2.4 million collected a year, roughly 3,200 cases, net collection rate 91.4% before the change.

The basis: net collection rate rose from 91.4% to 97.8% over the first six months across 38 client practices (Luxen client data); the fee is the band midpoint; the AR line uses 22 days removed. Against the in-house total, that is $187,600 of internal cost versus $115,562 of fee.

Luxen charges 3% to 6% of collections. No setup fee, no exit fee, month to month with 30 days notice.

What moves the number inside the band

• Case volume. A center billing 400 cases a month sits lower than one at 90.
• Implant and carve-out workload, adding reconciliation to every device case.
• Payer mix, since variable commercial contracts cost more to audit.
• Number of service lines, each adding a documentation path.

What the percentage covers

Eligibility and benefits verification, authorization and appeal work, coding, claim production and scrubbing, submission through your clearinghouse, payment posting, underpayment identification, denial work by root cause, AR follow-up and monthly reporting. Statements run through our patient billing team.

No competing page compares the two costs, which is the decision an administrator is making. Below, a center collecting $2.4 million a year, on fully loaded staffing not base salary. Rates vary by market; see our state-by-state comparison.

When in-house still wins

A single-specialty center with a narrow code set, one or two dominant payers and a long-tenured coder is often better off keeping the work, provided a second person can cover. 34% of practice managers replaced a biller in the past two years (Luxen Practice Manager Survey 2026).

The question people type is which firms are largest. Size does not predict whether a vendor can rank a multiple procedure case correctly. Score each candidate out of 20, four points per criterion, and require a worked example.

A vendor that cannot produce a denial report in the first meeting will not produce one later. 63% could not name their top three denial reasons (Luxen Practice Manager Survey 2026).

Every center already has someone doing the work, so the question is what a change costs and how fast it repays.

A signed BAA, then access to the systems you run, then contract terms and rate tables loaded, then the oldest AR worked while current cases keep flowing. No migration, no gap in submission. Expect roughly two weeks from a signed BAA to claims being worked, and first recovered payments about three weeks in. Legacy AR is worked in parallel: we recovered 61% of the dollar value of claims aged 90 to 180 days that practices had stopped working, and claims aged past 180 days were recovered at 23% of dollar value (Luxen client data).

Surgery centers run case management, costing and billing in ASC-native systems. We work inside whatever you run, under a signed BAA, no migration.

Automate in this order, because each step makes the next worth more. First, eligibility re-verification tied to the date of service, not the booking date. Second, an unbilled case queue that ages like an AR report. Third, a rate table comparing every remittance against contract. Fourth, denial routing by root cause. Predictive scoring last, since it needs clean history. 38% had changed EHR or practice management system in the past five years, and of those, 71% said collections dipped for at least six months after the switch (Luxen Practice Manager Survey 2026).