Anesthesia billing: what hospital leaders should ask to see

If your hospital funds an anesthesia group through a subsidy, income guarantee or stipend, you are paying for the gap between what the group collects and what it costs to staff your rooms. Before you approve the next increase, you need to see how hard the group is working that gap from the collections side, not only the staffing side.

Most subsidy requests arrive as a single number, sometimes with a page of narrative about Medicare rates and clinician pay. Those forces are real, but a request that never shows you collections data is asking you to trust that under-collection is not part of the story. This piece is about what to ask for and how to read it; for the contract terms, the Medicare and labor forces behind a request, and how to build ongoing visibility into the data, see our ten questions before you renew, why anesthesia subsidies keep rising and open-book, reconciled subsidy structures.

Why this is a billing question, not only a staffing one

Two things set what a group collects: what it bills, and how well it collects what it bills. Your OR schedule, case mix and coverage grid drive the first. The group's billing operation, payer contracting and documentation drive the second. Weak collections tighten the math on the side the group controls, and it becomes easy to point at Medicare and the labor market for a gap that billing performance also created.

Payer mix and rate matter here. Medicare's 2026 anesthesia conversion factor is $20.4976 per unit for most clinicians.¹ Kaufman reports the national average commercial payment was $80.70 per unit in 2024, and that some hospital-based groups collect as much as twice the commercial reimbursement of others, depending on how well their contracts were negotiated.² A group sitting on weak commercial rates, slow billing or high denials looks, from your seat, identical to a group facing an unavoidable Medicare and labor squeeze. You cannot tell the two apart without the data. (Our explainer on anesthesia-specific billing covers how base and time units and modifiers work, if you want the mechanics first.)

The data set to request

Ask for this monthly, for the last three years, broken out by payer class and by location. Write the request, and the group's obligation to keep providing it, into the contract itself, with your healthcare counsel drafting the reporting and audit-rights language.

• Collections by payer class. Medicare, Medicaid, each major commercial plan and self-pay, shown separately.
• Units billed per case, base and time, by location. What is actually billed for the work in each anesthetizing location.
• Payer mix. The share of cases by payer, from the group's own billing system.
• Charge lag. Days from the date of service to when the charge posts.³
• Days in accounts receivable, and the share over 120 days. How long it takes to get paid, and how much sits stuck.
• Denial rate, and the top denial reasons. The share of claims a payer denies, and why.³
• Clean claim rate. The share of claims that go through the first time with no manual rework.³
• Net collection rate. What the group actually collects, against what it was contractually entitled to collect.
• Write-offs and bad debt. Amounts written off, by category: contractual, small-balance, bad debt, charity.
• Underpayment recovery. What the group identifies and recovers when a payer pays less than the contract calls for.
• Out-of-network and independent dispute resolution (IDR) income share. How much revenue comes from out-of-network billing and arbitration instead of contracted rates.
• Time documentation completeness. The share of cases with complete start, stop and key-event times in the anesthesia record.
• Medical direction compliance rate. The share of medically directed cases with documentation supporting all of Medicare's conditions for medical direction.
• Billing fee. What the group pays its billing company or in-house billing operation, usually a percentage of collections.

What the numbers mean

Collections and payer mix. A falling net collection rate, or a payer mix drifting toward Medicare and Medicaid while volume holds or rises, should worry you more than the headline subsidy figure. Lower write-offs and bad debt are better, especially in the discretionary categories, such as small-balance write-offs, that a billing operation controls more than true bad debt does.

Speed. Shorter charge lag and fewer days in A/R mean the group is collecting faster, with less cash tied up along the way. HFMA's MAP Keys, the industry-standard revenue cycle KPI framework, define charge lag as the days from date of service to when the charge posts, and define a remittance denial rate to track compliance with payer requirements.³ Lower is better on both, and on the age of what is still outstanding. One MGMA analysis of multispecialty practice data found a median of 13.5% of total accounts receivable sitting more than 120 days old; a group's figure climbing well past that deserves a question.⁴

Claim quality. A high clean claim rate means fewer claims need rework before they are paid, which is faster and cheaper for both sides. A rising denial rate, or one concentrated in a few reasons the group cannot explain, points to a documentation, coding or payer-enrollment problem worth fixing before it grows.

Out-of-network and IDR income. Under the No Surprises Act, disputes between out-of-network providers and insurers can go to federal arbitration. Providers and facilities won 80% of disputes from 2023 through mid-2024, and the median payment determination in anesthesia disputes ran about twice the insurer's benchmark rate.⁵ A growing share of a group's revenue built on arbitration outcomes, rather than negotiated in-network rates, is a less stable base for your subsidy math to rest on, even where it is entirely lawful and can pay well for the group.

Documentation. Medicare's medical direction rules require the directing anesthesiologist to complete a defined set of steps on every case, including the pre-anesthetic evaluation, presence at the most demanding parts of the anesthetic such as induction and emergence, and post-anesthesia care, and to document that each one happened.⁶ Weak time documentation and weak medical direction documentation both create billing risk and quiet revenue leakage. Track them as their own line, not folded into a general assurance that compliance is fine.

Billing fee. Ask what the group pays for billing, as a percentage of collections, and how that percentage has moved. A fee that climbs while collections performance does not raises the question of what the extra cost is buying.

Reconcile the group's reports against your own data

Do not take any of this on faith. Set the group's reports against data your hospital already holds.

• Case counts and time. Compare your OR system's case counts and anesthesia start and stop times against the group's billed cases and time units, by location and month. A gap that runs the same direction every month is worth an explanation.
• Payer mix. Compare your registration system's payer mix against the group's billed payer mix. The two should track closely. A persistent gap points to billing delays, coding problems, or a registration process not capturing what patients actually carry.
• Volume and revenue. Line up your own case volume against the group's collections trend. Collections should move with volume. When volume holds and collections fall, or volume falls and the request does not adjust, the numbers are telling you something the narrative is not.

Red flags

• Refusal to share the data. A group that will not provide payer-level collections, unit counts and denial detail is asking you to fund a number you cannot check.
• Aggregate-only reporting. A single collections total, with no breakdown by payer, location or denial reason, hides more than it shows.
• A sudden payer mix shift. Especially one the group cannot explain from your own registration or case data.
• Rising denials with no corrective plan. A denial rate trending up quarter over quarter, with the same top reasons recurring each time.
• Billed time that does not match your EHR. Persistent gaps between anesthesia record times and billed time units.
• Collections falling while volume rises. Often the clearest sign that a collections problem, not a market force, is driving part of the request.

Worked example: a 4-point collections gap

The numbers below are made up to show how a small collections gap turns into a subsidy dollar figure.

Assume a hospital's anesthesia group bills 12,000 cases a year, averaging 12 total units per case (base plus time), at a blended rate across payers of $45 per unit if collected in full. Full potential collections: 12,000 cases × 12 units × $45 = $6,480,000.

Now assume the group's net collection rate runs 4 percentage points below what a well-run group should achieve on the same payer mix, say 90% instead of 94%, because of slower charge lag, a higher denial rate and weaker underpayment recovery. That 4-point gap is $259,200 a year left uncollected on this volume ($6,480,000 × 4%).

A group absorbing that gap out of its own margin might carry it quietly for a while. A group asking the hospital to make up the difference through a larger subsidy is asking you to fund a billing performance problem as though it were a market problem. The fix for a collections gap like this is not a bigger subsidy. It is a billing review.

What to do next

• Write the data set into the contract, with your healthcare counsel, as a standing reporting obligation with audit rights, not a one-time favor.
• Set up the reconciliation. Compare your own OR, EHR and registration data against the group's reports every quarter, not only at renewal.
• Track the trend, not one month. A single bad month happens. A KPI moving the wrong way for two or three quarters running is a pattern.
• Ask who is accountable for billing performance inside the group, and whether that role, or a subcontracted billing company, has changed recently.
• Get a billing-specific review before you approve an increase built on collections you have not verified.

Sources

1. American Society of Anesthesiologists, "CMS Finalizes Policies Undermining Anesthesia Payments and Ability for Anesthesiologists to Meaningfully Participate in the Quality Payment Program," ASA Washington Alerts, October 2025. https://www.asahq.org/advocacy-and-asapac/fda-and-washington-alerts/washington-alerts/2025/10/cms-finalizes-policies-undermining-anesthesia-payments-and-ability-for-anesthesiologists-to-meaningfully-participate-in-the-quality-payment-program ↩

2. Nathan Kaufman, "Nathan Kaufman: Hospital-based anesthesia and radiology operate in a broken financial model," HFMA, January 2026. https://www.hfma.org/finance-and-business-strategy/physician-compensation/hospital-based-anesthesia-and-radiology-a-broken-financial-model/ ↩

3. Healthcare Financial Management Association, "MAP Keys: Industry-Standard Revenue Cycle KPIs," HFMA MAP Initiative, undated. https://www.hfma.org/data-and-insights/map-initiative/map-keys/ ↩ ↩² ↩³ ↩⁴

4. Medical Group Management Association, "Not-so-graceful aging: Half of practices saw days in A/R increase in 2021," MGMA Stat, November 2021. https://www.mgma.com/mgma-stats/not-so-graceful-aging-half-of-practices-saw-days-in-a-r-increase-in-2021 ↩

5. Matt McGough, Nisha Kurani and Michelle Long, "The performance of the federal independent dispute resolution process through mid-2024," Peterson-KFF Health System Tracker, May 2025. https://www.healthsystemtracker.org/brief/the-performance-of-the-federal-independent-dispute-resolution-process-through-mid-2024/ ↩

6. U.S. Code of Federal Regulations, "42 CFR § 415.110 – Conditions for payment: Medically directed anesthesia services," via Legal Information Institute, Cornell Law School, current text. https://www.law.cornell.edu/cfr/text/42/415.110 ↩