Facility billing and coding for single-specialty and multispecialty surgery centers, from eye, GI and pain centers to orthopedic and spine ASCs.
A surgery center rarely loses money on the cases it bills cleanly. It loses it on the case canceled after anesthesia but coded as if it stopped before, the implant invoice that reached billing after the claim went out, and the code whose status changed in a quarterly update nobody loaded. Each becomes a partial payment, a denial or a recoupment. Our certified coders check every case against Addendum AA, the op note and the device log before the facility claim leaves your system.
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ASC billing services manage the facility side of a surgery center revenue cycle: checking each procedure against Medicare's ASC covered procedures list, coding payment modifiers such as 73, 74, FB and FC, billing implants and pass-through devices, and working denials. In a Luxen claim audit, modifiers 73 and 74 were missing or reversed on 9% of discontinued ASC cases.
About 6,400 ASCs treated 3.4 million fee-for-service Medicare beneficiaries in 2024, and 68% specialize in a single clinical area, according to MedPAC. Billing problems follow the specialty.
We bill the facility claim and, when owners want one partner, the surgeon, anesthesia and pathology claims through full-service medical billing, coded by our certified medical coders.
Most lost ASC revenue is a partial payment that looks final on the remittance. Our denial and AR recovery team works these dollars oldest first. Dollar figures use the CY2026 Medicare national ASC rate for 66984, $1,255.73, or Luxen data.
| Scenario | Codes | What goes wrong | $ at stake per claim | Luxen audit finding |
|---|---|---|---|---|
| Case stopped after anesthesia was induced | 66984 with 74 | Billed with 73, paid at 50% instead of 100% | $627.87 per cataract case | Modifiers 73 and 74 were missing or reversed on 9% of discontinued ASC cases, across 3,900 ASC facility claims |
| Bilateral procedure | RT and LT lines, or 2 units | Billed with modifier 50 instead of as two procedures | Full claim, when the contractor rejects it | Coding and modifier errors caused 21% of denials |
| Device furnished free or with credit | Device-intensive (J8) code | FB or FC left off, full device portion paid | Device portion, recouped on review | The FB or FC modifier was missing on 5% of device-intensive ASC claims with a no-cost or credited device |
| Commercial implant carve-out | Implant line plus invoice | Invoice not attached, implant line denied | Full invoice cost of the implant | Implant invoices were missing from 14% of commercial ASC claims with an implant carve-out |
| Commercial claim paid below contract | Contracted percent of Medicare | Short payment posted as final | The average underpaid claim was short by $38 | Underpayments against contracted rates appeared on 7.8% of paid claims |
Medicare pays an ASC facility fee only for codes on the ASC covered procedures list, published in Addendum AA with a payment indicator for each code. The list changes in the annual rule and again in quarterly updates, such as the April 2026 update in MLN Matters MM14445.
| Indicator | What it means | Billing effect |
|---|---|---|
| A2, G2 | Surgical procedure on the ASC list (G2: non office-based, added CY2008 or later) | Paid on the OPPS relative payment weight |
| J8 | Device-intensive procedure | Adjusted rate; FB or FC when the device was free or credited |
| P2, P3, R2 | Office-based procedure added CY2008 or later | P3 on physician fee schedule practice expense; P2, R2 on OPPS weight |
| N1 | Packaged service or item | No separate payment |
| K2, J7 | Separately paid drug (K2); pass-through device (J7) | Own claim line; J7 is contractor priced |
For CY2026, CMS added more than 500 codes to the covered procedures list, started a three-year phase-out of the inpatient only list with 285 mostly musculoskeletal procedures, and moved five general exclusion criteria into nonbinding physician considerations under 42 CFR 416.166. The CY2027 proposed rule would add 618 more codes; comments closed August 31, 2026.
A newly payable joint or spine case may still fall outside a contract written against the old list, so we check each new code against Addendum AA and the contract before scheduling.
Medicare ASC claims go out on the 837P professional format, or rarely the CMS-1500, with place of service 24. On those claims the modifier moves more money than the code does.
| Modifier | When it applies | Payment effect |
|---|---|---|
| 73 | Discontinued in the operating room before anesthesia is induced | 50% of the rate, no further multiple procedure reduction |
| 74 | Discontinued after anesthesia is induced or the procedure starts | 100% of the rate |
| 52 | Reduced services | 50% of the rate, no further multiple procedure reduction |
| FB, FC | Device at no cost or full credit (FB); partial credit of 50% or more (FC) | Reduced payment for listed device-intensive procedures |
| RT, LT | Bilateral procedure reported as two procedures | 50% multiple procedure reduction applies |
| PT | Screening colonoscopy that becomes diagnostic | Sets patient cost sharing on the procedure line |
The CY2026 ASC conversion factor is $56.322 for centers meeting quality reporting and $55.224 for centers that do not, after a 2.6% update (3.3% market basket minus 0.7 points productivity). Failing the ASC Quality Reporting Program costs 2.0 percentage points of the annual update on every Medicare case that year.
| Step | Calculation | Amount |
|---|---|---|
| National rate, 66984 | CY2026 Addendum AA | $1,255.73 |
| Wage-adjusted rate | ($627.87 x 1.10 wage index) + $627.87 | $1,318.52 |
| Medicare payment | 80% of $1,318.52 | $1,054.81 |
| Patient coinsurance | 20% of $1,318.52 | $263.70 |
| Same case billed with 73 | 50% of $1,318.52 | $659.26 |
Before the Part B deductible and sequestration; the 1.10 wage index is an example, not a locality.
Codes with a device offset above 30% of procedure cost are device-intensive (J8). When the device was free or credited, FB or FC tells the contractor to pay the reduced price from the CMS adjustment tables, and coinsurance drops with it.
The rule: Medicare stopped requiring SG on ASC facility claims on January 1, 2008 (Claims Processing Manual, Chapter 14, section 50). What it costs: rework on every line built from an outdated modifier template. Coding and modifier errors caused 21% of denials (Luxen claim audit).
The rule: a five-year CMS ASC prior authorization demonstration covers blepharoplasty, botulinum toxin injections, panniculectomy, rhinoplasty and vein ablation in 10 states since early 2026, including Florida, New York and Texas. It is voluntary, but claims that bypass it go to prepayment medical review. What it costs: payment held. Missing or invalid prior authorization caused 17% of denials (Luxen claim audit). Centers in these demonstration states can see local payer rules on our Florida medical billing, New York medical billing and Texas medical billing pages, and our eligibility and prior authorization team files the Medicare requests.
The rule: Medicare claims must be filed within 1 calendar year of the date of service (42 CFR 424.44), and commercial contracts set their own limits. What it costs: the whole case. Timely filing caused 6% of denials, and only 4% of those were recovered (Luxen claim audit).
The rule: on Medicare, a modifier or code error on a processed claim is fixed through a reopening within one year; only claims returned with MA130 or N704 are resubmitted as new (Noridian reopening guidance). What it costs: a duplicate denial and a second wait. Duplicate claim denials made up 9% of denials, mostly from resubmitting instead of correcting (Luxen claim audit).
We run the revenue cycle from eligibility to zero balance inside the practice management system you already use. How full-service billing works.
Certified coders review charges against your documentation and payer rules before the claim goes out, so the denial is prevented rather than appealed. Medical coding.
Aged and denied claims are worked to resolution, then the upstream cause is fixed so the same claims stop coming back. Denials and AR recovery.
Benefits are verified and authorizations secured before the appointment, which is the cheapest place in the cycle to stop a denial. Eligibility and prior authorization.
Statements, balance questions and payment plans are handled by the same team that worked the claim. Patient billing.
Payer enrollment and re-credentialing are tracked through to approval, so a lapsed credential never quietly stops payment. Credentialing.
A HIPAA-trained front-office assistant working inside your EHR on calls, scheduling, intake and referrals, alongside the billing team. Medical virtual assistant.
Surgery centers run scheduling, case costing and billing in ASC systems such as HST Pathways, SIS and AdvancedMD, with procedure notes in Provation or gMed for GI, Nextech for eye and plastics, and Epic at many hospital joint ventures. Surgeon and anesthesia groups add athenahealth, NextGen or eClinicalWorks. We work inside the system you already use, under a signed BAA, with no migration, reading the op note, implant log and supply sheet where your staff record them.
2 weeks
from a signed BAA to our team working your claims
About 3 weeks
to the first recovered payments on aged AR
20+ years
combined billing and coding experience
Luxen claim audit (61,400 claims audited, Jan 2025 to Jun 2026) and Luxen billing reviews (410 practice billing reviews, Jan 2025 to Jun 2026), ASC data only:
Device invoices and implant logs were reaching billing after the facility claim had already gone out. Luxen added a final case reconciliation, recovered $132,600 in underpaid or incomplete claims, and cut implant-related corrections by 68%.
Administrator, orthopedic ambulatory surgery center
A case could remain unbilled while the operative note, anesthesia record, or supply sheet sat in a different queue. Luxen created one case-completion checklist, reducing average claim lag from ten days to two.
Revenue Cycle Manager, multispecialty surgery center
Full engagements are written up in our dental practice case study and our ambulance billing case study.
| Metric | Luxen data |
|---|---|
| Days in AR | Surgery centers reviewed carried a median 42 days in AR, across 23 surgery centers (Luxen billing reviews) |
| Denials left unworked | 19% of denied claims were never reworked or appealed (Luxen billing reviews) |
| First-pass denials after onboarding | Across 38 client practices, first-pass denial rate fell from 14.2% to 6.1% within 90 days of onboarding (Luxen client data) |
The CY2027 proposed rule would raise ASC rates 2.4%, or 0.4% for centers failing quality reporting, and proposes an adjustment to payment for no-cost, full credit and partial credit devices. Load the final Addendum AA, recheck contract rate tables and confirm FB and FC handling before January 1.
Surgical balances are large, and estimate rules for uninsured and self-pay patients are federal.
When a Medicare screening colonoscopy becomes a polypectomy, the PT modifier goes on the procedure code and coinsurance is 15% through 2026, 10% for 2027 to 2029 and zero from 2030. A December estimate for a January case needs the new percentage.
Practices lost 3.1% of collections to patient balances written off before a second statement (Luxen client data), which is why our patient billing team sends plain-language statements and text reminders.
3% to 6% of collections
Luxen's pricing generally falls between 3% and 6% of collections, depending on claim volume, specialty, payer mix, and how much of the revenue cycle your practice hands over.
Higher-volume practices usually land toward the lower end. Smaller or more complex practices land higher because there is more work per account. There is no setup fee and no exit fee, and the agreement runs month to month with 30 days notice.
A lower fee attached to weak billing is still expensive. The number that matters is what your collections do after you hire someone.
Luxen charges 3% to 6% of collections, depending on case volume, implant and carve-out workload and payer mix. No setup or exit fee.
| Service line | Monthly collections | Luxen at 3% | Luxen at 6% |
|---|---|---|---|
| Medicare and Medicare Advantage facility claims | $56,000 | $1,680 | $3,360 |
| Commercial facility claims | $88,000 | $2,640 | $5,280 |
| Implants, pass-through devices and drugs | $16,000 | $480 | $960 |
| Total | $160,000 | $4,800 | $9,600 |
| Cost | In-house | Luxen |
|---|---|---|
| Monthly | $12,640 (7.9% of collections) | $4,800 to $9,600 |
| Annual | $151,680 | $57,600 to $115,200 |
| When a biller leaves | Open biller roles took a median 67 days to fill | No gap in coverage |
| Terms | Salaries, benefits and software | Month to month, 30 days notice |
Fully loaded in-house billing cost 7.9% of collections for practices under $2M, across 96 practices that shared payroll data (Luxen billing reviews). A center collecting $160,000 a month collects $1.92M a year, inside that range.
| Partner | ASC facility rules | Coverage when staff leave | Terms |
|---|---|---|---|
| In-house biller | Depends on one person | Gap until the role is filled | Salary, benefits, software |
| Generalist billing company | Built around physician claims | Team coverage | Varies; read the exit clause |
| ASC specialty billing company | Facility claims are the core work | Team coverage | Varies; read the exit clause |
| EHR or PM vendor RCM | Tied to that software | Vendor team | Linked to the software relationship |
| Luxen | Certified coders; Addendum AA, modifier and implant checks on every case | Team coverage, no gap | Month to month, 30 days notice, no setup or exit fee |
To see how options differ by state and fee model, compare medical billing companies.
A 30-minute look at your AR ageing, denial reasons and payer mix. You leave knowing what is recoverable, what we would work first and what it would cost.
We sign a business associate agreement before anyone touches your system. Your named team then works inside the practice management system and clearinghouse you already use. Nothing is migrated, and claims are being worked within two weeks of the signed BAA.
Aged and denied claims come first because that is revenue you have already earned. Most practices see the first recovered payments inside three weeks.
Once the backlog is moving, we take over the agreed part of the daily cycle: eligibility, coding review, submission, posting, denials and patient balances.
You know who owns your claims. The team works inside the practice management system and EHR you already run, with no migration.
Claims are coded by certified coders against your documentation and payer rules. Automation handles the repetitive checks so people spend their time on the claims that need judgment.
We sign a business associate agreement before accessing protected health information, and access is limited to the named people on your account.
We look at your AR ageing, volume, payer mix and denial profile first, then tell you what we believe is recoverable and what it would cost.
A billing company is a poor fit if you are not willing to share visibility into your billing, if the vendor uses a rotating pool of people who never learn your practice, or if it cannot explain why your claims are being denied. Be wary of anyone promising large collection increases before they have seen your AR ageing. The right partner makes your revenue cycle more visible, not less.
ASC stands for ambulatory surgical center, a facility whose patients are expected to leave within 24 hours of admission under 42 CFR 416.2. ASCs do bill a facility fee, which Medicare pays at the Addendum AA rate for each covered procedure, such as $1,255.73 nationally for cataract surgery 66984 in 2026. The surgeon and anesthesia provider bill their own claims.
Hospital outpatient departments bill Medicare on institutional claims paid under OPPS, while ASCs bill on the 837P professional format with place of service 24. Most ASC rates start from OPPS relative payment weights but use a lower conversion factor, $56.322 for CY2026. ASC claims also run through the practitioner NCCI edits.
About 2 weeks from a signed BAA to working claims: median time from signed BAA to first claims worked was 9 business days (Luxen client data). We load payer contracts, carve-out terms and Addendum AA indicators first, then work the oldest AR. First recovered payments arrived a median of 17 days after work began (Luxen client data).
Yes. We work inside the ASC and practice management systems you already run, including HST Pathways, SIS, AdvancedMD and Epic, with no migration. Access starts only after a signed BAA, and claims go out through your existing clearinghouse.
If anesthesia was not yet induced, Medicare pays 50% of the rate with modifier 73; after induction or once the procedure starts, modifier 74 pays 100%. On a device-intensive procedure, the 73 calculation removes the device portion first. Modifiers 73 and 74 were missing or reversed on 9% of discontinued ASC cases in our claim audit.
Thirty minutes, no deck and no fee. We look at what is sitting past 90 days and where your denials cluster, and you leave knowing what is recoverable, what we would work first, and what it would cost.
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