A collection rate measures how much of the money an anesthesia practice bills actually gets collected. There are two versions, gross and net, and confusing them is the fastest way to misread your group's financial health.
If you own a share of a group, or your pay has any tie to collections, these two numbers decide what lands in your account. Here is what they mean and what moves them.
Key points
- Net collection rate measures collected dollars against collectible dollars.
- Gross rates always look low; they mostly reflect inflated billed charges.
- Payer mix drives anesthesia collections more than billing skill does.
- Ask for the calculation behind any quoted rate, never the number alone.
Gross vs net collection rate
Gross collection rate is payments received divided by total charges at full billed rates. Billed charges in anesthesia are often set far above what any payer actually pays, so gross rates always look low. A low gross rate mostly reflects the gap between the chargemaster and contracted rates.
Net collection rate is payments received divided by the amount the practice was contractually allowed to collect. It strips out contractual write-offs. This is the number that tells you how well the billing operation performs, because it measures collected dollars against collectible dollars.
A simple example. A case is billed at $2,000. The payer contract allows $800, and the practice collects $760. Gross collection rate on that case is 38 percent. Net collection rate is 95 percent. Same case, very different stories.
When someone quotes a single "collection rate" with no adjective, ask which one. Gross rates vary with how aggressively charges are set, so comparing gross rates across groups means little.
Why anesthesia is different
Anesthesia billing has quirks that other specialties do not have.
Unit-based pricing. Anesthesia payment is base units plus time units, multiplied by a conversion factor. Medicare's national anesthesia conversion factor for 2026 is about $20.50 per unit, while commercial contracts pay their own negotiated rates per unit. The spread between Medicare and commercial rates per unit is wide, so payer mix drives collections more than almost anything else.
No control over patient volume or payer mix. The surgeons and the facility decide who shows up. An anesthesia group inherits the hospital's payer mix, including Medicaid, self-pay, and trauma cases.
Out-of-network complexity. The federal No Surprises Act limits balance billing for out-of-network care at in-network facilities and routes many disputes through an arbitration process. That changed how out-of-network anesthesia claims resolve and when the money arrives.
Time documentation. Every claim depends on accurate start and stop times and correct modifiers. Sloppy documentation creates denials, and denials suppress net collections. See /anesthesia-claim-denials/ for the common failure points.
What drives collections down
- Payer mix shifting toward Medicare and Medicaid, which pay fewer dollars per unit than commercial plans.
- Denials that never get worked. Unworked denials become write-offs.
- Missed timely filing deadlines. Medicare generally requires claims within one calendar year of the date of service.
- Credentialing gaps. A CRNA seeing patients before enrollment is complete often means held or denied claims.
- Incomplete concurrency and modifier reporting on medically directed cases.
- Patient balances. High-deductible plans move more of the allowed amount onto patients, and patient collections run lower than payer collections.
We are deliberately not quoting benchmark percentages here. Published anesthesia benchmarks come from proprietary surveys, differ by methodology, and get stale fast. Judge your group against its own contracts and its own trend line.
Questions to ask about your group's numbers
If you are a partner, or negotiating to become one, ask for these in writing.
- What is our net collection rate, and how is "allowed amount" defined in the calculation?
- How are contractual adjustments separated from bad debt write-offs in the reports?
- What is our denial rate, and what share of denials gets overturned?
- What are days in accounts receivable, and what share of AR is over 90 days old?
- What is our payer mix by units, and how has it moved over the past two years?
- Who works denials, and what happens to claims the billing company gives up on?
A billing company that cannot answer these quickly is a finding in itself. If you are evaluating ownership economics, model scenarios with the /crna-group-revenue-calculator/ and read /how-to-start-a-crna-group/ and /for-crna-practice-owners/.
What is a good net collection rate?
There is no universal number we can responsibly quote. Compare your group to its own history, and ask your billing company to show the calculation, not only the result.
Why is our gross collection rate so low?
Usually because billed charges are set well above contracted rates. That is normal in anesthesia. Focus on the net rate instead.
Does a high net collection rate mean the group is healthy?
Not by itself. A group can collect nearly everything it is allowed and still struggle if its contracted rates per unit are poor. Rate negotiation and collection performance are separate problems.
This page is general information, not financial or legal advice. Review your group's specific contracts with a qualified advisor.