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Ambulatory Surgery Center Billing & RCM

Ambulatory Surgery Center billing and revenue cycle, 50-state coverage.

Ambulatory surgery center (asc) billing services from ASP-RCM Solutions. 19,126 NPPES ASC billing providers across all 50 states + DC. HIPAA + SOC 2 Type II compliant. Senior partners on every account.

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What good ASC billing execution looks like.

The operating discipline we install on every ASC billing engagement.

  1. Medicare ASC payment system (ASCFS) understandingASC Medicare payment follows Ambulatory Surgical Center Fee Schedule with distinct payment levels per CPT. ASC billing teams need ASCFS-aware revenue forecasting.
  2. Implant + device pass-through billingSome implants and devices qualify for pass-through pricing in addition to procedure payment. Accurate device billing captures pass-through revenue otherwise lost.
  3. Charge capture across OR + ancillary servicesASCs leak 1-3 percent of net revenue to missed charges. Reconciliation against case logs catches gaps.
  4. Prior authorization for ASC proceduresCommercial PA for elective ASC procedures (orthopedic, GI, pain, ophthalmology) requires API-integrated submission and documentation packaging.
  5. Out-of-network ASC billing strategyASCs operating out-of-network with commercial payers need clean billing workflow, patient cost transparency, and dispute resolution capability.
  6. Multi-specialty case mix managementMulti-specialty ASCs need coders with depth across each specialty operating in the facility (ortho, GI, ophth, pain, ENT, etc.).

Case to cash, drawn to scale

An ASC case leaks in four places, and none of them is the claim.

There is no honest dashboard screenshot to put here, so we built the exhibit instead. The map below plots the actual Medicare ASC payment structure against the four points where a surgery center loses money, all of them upstream of the clearinghouse.

ASC case to cash map with the four leak points ONE ASC CASE, FROM SCHEDULING TO POSTED CASH 0102030405 Scheduling,eligibility andprior authorization Covered procedureslist and paymentindicator check Case performed,implant and devicecapture at the field Coding and claimbuild, facility line,procedure ranking Payment, postingand the underpaymenttie-out LEAK 01LEAK 02LEAK 03LEAK 04 Elective case goesahead on a staleauthorization, or theplan authorized adifferent CPT thanthe one performed. Procedure is not onthe covered list, orcarries an office-basedindicator that capspayment at the lowerof two amounts. Implant or device costnever leaves theoperative record. Noinvoice, no serialnumber, no carve-outclaim to the payer. Procedures ranked inthe wrong order, sothe reduction lands onthe higher-paying lineinstead of the lower-paying one. WHERE IT SURFACES None of the fourarrives as a denial.They arrive as apayment that issmaller than it shouldhave been. THE THREE RATE PATHS AN ASC LINE CAN TAKE Standard, indicators A2 and G2 Relative payment weight multiplied bythe ASC conversion factor. Device-intensive, indicator J8 Only the non-device service portionmoves with the conversion factor. Office-based, P2, P3 and R2 The lower of the physician fee schedulenonfacility amount or the ASC amount. A surgery center that cannot say which of the three paths priced a given line cannot tell an underpayment from a correct payment.

Source: Medicare Program, Hospital Outpatient Prospective Payment and Ambulatory Surgical Center Payment Systems final rule with comment period for CY 2026 (CMS-1834-FC), 90 FR 53448, published November 25, 2025, effective January 1, 2026. Payment indicator definitions and the covered procedures list are published by CMS in Addenda AA and BB to that rule.

The numbers that govern an ASC year

Six ambulatory surgery center figures worth knowing cold.

Every figure below comes from the CY 2026 OPPS and ASC final rule. Nothing here is an estimate and nothing here is a client number.

$56.322
CY 2026 ASC conversion factor

For centers that successfully meet the quality reporting requirements. It is the CY 2025 factor of $54.895 adjusted by a wage index budget neutrality factor of 1.0000 and the 2.6 percent productivity-adjusted market basket update.

CY 2026 OPPS/ASC final rule, 90 FR 53448
$55.224
The quality reporting penalty

The conversion factor for centers that do not meet the reporting requirements, built on a 0.6 percent update instead of 2.6. That is $1.098 off every weight unit, on every case, for a full year.

CY 2026 OPPS/ASC final rule, 90 FR 53448
547
Codes added to the CY 2026 list

CMS added 276 procedures to the ASC covered procedures list on revised criteria, plus 271 more codes finalized for removal from the inpatient only list. The arithmetic is 276 plus 271, shown so you can check it.

CY 2026 OPPS/ASC final rule, 90 FR 53448
30%
Device-intensive threshold

A procedure earns device-intensive status, payment indicator J8, when the HCPCS code-level device offset is greater than 30 percent. New device-intensive procedures without claims data default to a 31 percent offset.

CY 2026 OPPS/ASC final rule, 90 FR 53448
50%
Multiple procedure reduction

Most covered surgical procedures are subject to a 50 percent reduction in the ASC payment for the lower-paying procedure when more than one is performed in a single operative session.

90 FR 53448, citing 72 FR 66829 to 66830
$9.2B
Estimated CY 2026 ASC payments

Total Medicare payments to ASCs for CY 2026, including beneficiary cost sharing and estimated changes in enrollment, utilization and case mix. That is roughly $450 million more than CY 2025.

CY 2026 OPPS/ASC final rule, 90 FR 53448

Rate construction

What the second procedure is actually worth.

Two structural rules do more to set an ASC facility payment than anything a biller does after the fact. The first splits a device-intensive rate into two halves that behave differently. The second decides which line in a multi-procedure session takes the reduction, and getting the ranking backwards costs real money on every combined case.

ASC device-intensive rate split and multiple procedure payment reduction DEVICE-INTENSIVE PROCEDURE, PAYMENT INDICATOR J8: ONE RATE, TWO BEHAVIOURS DEVICE PORTION SERVICE PORTION, THE NON-DEVICE COST OF THE CASE Drawn at a 31 percent device offset, the default CMS applies to a new device-intensive procedure that has no claims data of its own. The device portion is not scaled for budget neutrality and is not multiplied by the conversion factor. Only the service portion is. A center that models a J8 procedure as if the whole rate moved with the annual update will forecast the wrong number every single year. THREE PROCEDURES, ONE OPERATIVE SESSION, RANKED BY ASC PAYMENT Highest-paying procedure Second procedure Third procedure 100% OF THE ASC RATE 50% PAID, 50% REDUCED 50% PAID, 50% REDUCED Most covered surgical procedures carry a Y in the Addendum AA column headed To be Subject to Multiple Procedure Discounting. Rank the session by ASC payment, not by the order the surgeon performed them, or the reduction lands on the wrong line and stays there.

Source: CY 2026 OPPS/ASC final rule with comment period, 90 FR 53448. The 50 percent multiple procedure reduction policy is described there with reference to the CY 2008 OPPS/ASC final rule at 72 FR 66829 through 66830. Device-intensive ratesetting and the greater than 30 percent device offset test are set out in the same rule.

Payment indicators and the facility line

The five things that decide an ASC facility payment.

An ASC facility claim is not a professional claim with a different place of service. It is priced by a separate fee schedule, ranked against the other procedures in the session, split at the device line, and in many contracts carried by a modifier that distinguishes it from the surgeon's claim for the same operation.

MechanicHow it worksWhat it costs when it is missedAuthority
The covered procedures listWhat Medicare will pay an ASC to doMedicare pays a facility fee only for procedures on the ASC covered procedures list. For CY 2026, CMS added 276 procedures on revised criteria and a further 271 codes finalized for removal from the inpatient only list, which itself is being phased out over three years starting with 285 mostly musculoskeletal services.A case scheduled off the list is a case with no facility payment at all. The list moves every January, so a scheduling rule set that was correct last year quietly goes wrong.90 FR 53448
Payment indicatorsThree different rate pathsIndicators A2 and G2 pay the relative payment weight multiplied by the conversion factor. J8 marks a device-intensive procedure where only the non-device service portion moves with the conversion factor. P2, P3 and R2 mark office-based procedures paid at the lower of the physician fee schedule nonfacility amount or the ASC standard amount.Modelling an office-based procedure at the standard ASC amount overstates expected payment. Modelling a J8 procedure as one undifferentiated rate misprices the annual update.90 FR 53448
Implant and device captureOffset over 30 percentDevice-intensive status attaches when the HCPCS code-level device offset is greater than 30 percent. Under Medicare the device cost is already inside the rate. Under commercial contracts an implant carve-out is a negotiated term, typically invoice plus a stated margin above a stated dollar threshold, and it is enforceable only with the invoice and the serial number attached.Medicare pays the same either way, so the loss is entirely on the commercial side: no invoice at the field means no carve-out claim, and the carve-out is usually the largest single line on an implant case.90 FR 53448 and payer contract
Multiple procedure reduction50 percent on the lower lineMost covered surgical procedures are subject to a 50 percent reduction in the ASC payment for the lower-paying procedure when more than one is performed in a single operative session. Addendum AA flags each procedure with a Y or a blank in the discounting column.Ranking the session by operative order rather than by ASC payment puts the reduction on the wrong line. On a combined case that is real money, repeated on every combined case.90 FR 53448, citing 72 FR 66829
Modifier SG and the splitFacility line versus professional lineOne operation produces two claims. The center bills the facility fee under the ASC payment system. The surgeon and the anesthesia provider bill their professional services under the physician fee schedule at the facility rate. Modifier SG is the HCPCS Level II modifier identifying the ASC facility service, and payers that require it will reject or misprice a facility line that omits it.A facility line processed as a professional line, or the reverse, is not a denial you can find in a denial report. It is a payment at the wrong fee schedule.HCPCS Level II modifier set

The labor-related share of an ASC payment is 50 percent, and it is adjusted by the pre-floor and pre-reclassified hospital wage index for the center's locality, so the national rates above are before the local adjustment. Source: CY 2026 OPPS/ASC final rule, 90 FR 53448, and 42 CFR 416.172(c).

Out of network and cash timing

Out-of-network revenue is a process, not a rate.

A surgery center operating out of network with commercial payers is not simply billing a higher number. It is running a documentation and dispute workflow, under a federal framework that changed what the center may bill the patient and where the disagreement gets settled.

DynamicWhat it means for a surgery centerWhere it bites
The facility is in scopeNon-emergency servicesAn ambulatory surgical center described in section 1833(i)(1)(A) of the Social Security Act is one of the four health care facility types named in the federal surprise billing framework for non-emergency services, alongside hospitals, hospital outpatient departments and critical access hospitals. Balance billing a patient for covered out-of-network services at an in-network facility is not the default option it once was.At the estimate
The out-of-network provider inside an in-network centerThe pattern that generates most surprise bills at a surgery center is not the facility. It is an out-of-network anesthesia provider, pathologist or independent laboratory operating inside an in-network center. Credentialing coverage across every provider who touches a case is the control, and it is a credentialing problem rather than a billing one.Before the case
The dispute laneDocumentation decides itWhen a payer and an out-of-network facility cannot agree, the disagreement moves to a defined dispute process rather than to a collections letter. What wins there is the operative record, the implant invoice, the authorization trail and a defensible basis for the charge, assembled at the time of the case rather than reconstructed months later.Post-payment
Prompt pay and the cash clockPrompt-pay terms are contract and state-law creatures, not federal ones, which means they differ by payer and by jurisdiction and have to be tracked per contract. A center that cannot name the prompt-pay window for each of its top payers cannot tell a slow payer from a stalled claim, and will work the wrong queue.Every cycle

Source for the facility scope row: Requirements Related to Surprise Billing, Part I, interim final rules with comment period, 86 FR 36872, published July 13, 2021, which names an ambulatory surgical center described in section 1833(i)(1)(A) of the Social Security Act among the health care facilities in scope for non-emergency services.

Top ASC billing markets by NPPES org count.

State-level RCM guides for the largest ASC billing markets in the U.S.

California3,077 orgs → Texas2,525 orgs → Florida1,257 orgs → Arizona895 orgs → Georgia783 orgs → Maryland748 orgs → New York733 orgs → Pennsylvania662 orgs →

View all 50 state guides →

ASC billing FAQ

Questions surgery center administrators actually ask.

What is the CY 2026 Medicare ASC conversion factor?

The final CY 2026 ASC conversion factor is $56.322 for ambulatory surgery centers that successfully meet the quality reporting requirements. CMS reached it by adjusting the CY 2025 conversion factor of $54.895 by a wage index budget neutrality factor of 1.0000 and the productivity-adjusted hospital market basket update of 2.6 percent, which is a 3.3 percent inpatient hospital market basket increase reduced by a 0.7 percentage point productivity adjustment. For centers that do not meet the reporting requirements the factor is $55.224, built on a 0.6 percent update instead. Both figures are national and sit before the local wage index adjustment to the labor-related share.

What is the ASC covered procedures list and what changed for CY 2026?

Medicare pays an ambulatory surgery center a facility fee only for procedures on the ASC covered procedures list. For CY 2026, CMS revised the criteria and added 276 procedures to the list on that basis, then added a further 271 codes finalized for removal from the inpatient only list. CMS is also phasing out the inpatient only list over three years, beginning with the removal of 285 mostly musculoskeletal services for CY 2026. Because the list changes every January, a scheduling rule set that was correct in one calendar year quietly becomes wrong in the next unless somebody owns refreshing it.

What do the ASC payment indicators mean?

The payment indicator tells you which of three rate paths priced the line. Indicators A2 and G2 use the ASC standard ratesetting methodology, which is the relative payment weight multiplied by the ASC conversion factor. Indicator J8 marks a device-intensive procedure, where the rate is structured so that only the service portion, meaning the non-device portion, is subject to the conversion factor. Indicators P2, P3 and R2 mark office-based procedures, which are paid at the lower of the physician fee schedule nonfacility practice expense based amount or the amount calculated under the ASC standard methodology. A center that cannot say which path priced a given line cannot tell an underpayment from a correct payment.

How does Medicare pay for implants and devices in an ASC?

A procedure is designated device-intensive, payment indicator J8, when the HCPCS code-level device offset is greater than 30 percent. New device-intensive procedures that lack claims data, including data from a predecessor or clinically related code, take a default device offset of 31 percent. For those procedures the rate is split: the device portion is not multiplied by the ASC conversion factor and is not scaled for budget neutrality, while the non-device service portion is. Under Medicare the device cost is therefore already inside the rate. Commercial implant carve-outs are different animals entirely, because they are negotiated contract terms rather than federal ones, and they are only enforceable when the invoice and the serial number are captured at the field.

How does the multiple procedure payment reduction work in an ASC?

Most covered surgical procedures are subject to a 50 percent reduction in the ASC payment for the lower-paying procedure when more than one procedure is performed in a single operative session. CMS flags which procedures are affected in Addendum AA to the annual rule, in the column headed To be Subject to Multiple Procedure Discounting, where a Y means the reduction applies. The operational point is the ranking: the session has to be ordered by ASC payment rather than by the order the surgeon performed the procedures, because ranking it backwards puts the reduction on the higher-paying line and the loss repeats on every combined case.

What is modifier SG and how does the facility versus professional split work?

Modifier SG is the HCPCS Level II modifier that identifies an ambulatory surgical center facility service. One operation produces two separate claims: the center bills the facility fee under the ASC payment system, while the surgeon and the anesthesia provider bill their professional services under the physician fee schedule at the facility rate. Payers that require modifier SG on the facility line will reject or misprice a facility claim that omits it, so the requirement has to be tracked per payer rather than assumed. A facility line processed at a professional fee schedule does not appear in a denial report at all. It appears as a payment at the wrong rate.

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ASC billing by state.

Dedicated ASC billing and credentialing field guides for 50 states. Each state guide opens into its city-level guides with local payer, Medicaid, and credentialing detail.