CRNA vs Anesthesiologist: Scope, Pay, and Who Bills the Case

A CRNA is an advanced practice registered nurse and an anesthesiologist is a physician, and both administer the full range of anesthesia. The gap between them is in the training, the pay, and the billing, not in what happens at the head of the operating table. In a care-team model the two work the same case side by side. In more than 30 states a CRNA does the work alone.

At 6:30 a.m. outside Operating Room 6 in a Denver hospital, a patient on a gurney waits for a knee replacement. A provider in a navy scrub cap leans in, confirms her name and her date of birth, marks the vein on the back of her hand, and explains what the next few minutes will feel like. The patient nods. She does not ask whether the person about to take away her consciousness and give it back is a nurse or a physician. She has no reason to. Both are trained to carry her through.

That is the part the public never sees, and it is the part that matters least to the budget that pays for the room. The patient cannot tell a CRNA from an anesthesiologist. The hospital's accounting department can tell them apart to the dollar. So can a recruiter, a malpractice carrier, and a private insurer. The two roles look identical from the gurney and diverge sharply everywhere money and policy are involved. Understanding that split is the whole point of the comparison.

CRNA vs Anesthesiologist at a Glance

Here is the head-to-head. The rows that look the same matter as much as the rows that differ.

What Each One Does

The scope of the work overlaps almost completely. There is no category of anesthetic an anesthesiologist administers that a CRNA does not also administer: general anesthesia, spinal and epidural blocks, sedation, obstetric anesthesia on the labor floor, and acute and chronic pain management. A patient under either provider gets the same pre-operative interview, the same airway management, the same minute-by-minute control of heart rate and blood pressure and oxygen, and the same careful reversal at the end. If you want the full picture of the day-to-day, start with what a CRNA actually does.

The roles differ in path and in framing more than in procedure. An anesthesiologist arrives through medicine and brings the breadth of a physician's training to the most medically complex cases and to leadership of the anesthesia department. A CRNA arrives through nursing and critical care, and in much of the country runs the anesthesia alone. The American Association of Nurse Anesthesiology calls CRNAs the predominant anesthesia providers in rural America, where a hospital often cannot recruit a physician anesthesiologist at all. The American Society of Anesthesiologists advocates for a physician-led care team. Both organizations are describing the same operating room from different ends of it.

The outcome research has weighed in. A widely cited 2010 study in Health Affairs found no measurable difference in patient safety when CRNAs delivered anesthesia without physician supervision, one of the findings that gave states the confidence to opt out of the federal supervision rule. Physician groups dispute the framing and argue for the value of the care team on complex cases. RxRooster takes no side in that debate. The market it serves hires both, and the safest provider for any given case is the one credentialed and ready for it.

The Training: Two Roads to the Same Table

The roads to the head of the table are different lengths. An anesthesiologist trains for roughly 12 to 13 years after high school; a CRNA reaches independent practice in about 7 to 8.

The physician path runs four years of college, four years of medical school, and a four-year anesthesiology residency, often followed by a one-year fellowship in a subspecialty such as pediatric or cardiac anesthesia or pain medicine. The nurse path runs a four-year Bachelor of Science in Nursing, at least a year of critical-care experience, and a doctoral nurse anesthesia program of about thirty-six months, capped by the National Certification Examination. As of 2025, every new CRNA enters the field with a doctorate; the master's path closed in 2022. The complete step-by-step is laid out in the guide to how to become a CRNA.

Those extra years are the simplest explanation for the pay gap. A physician carries more training, broader scope on the most complex cases, and the liability that comes with both. The shorter, lower-cost path into nurse anesthesia is also why the profession can scale to meet a shortage faster than medicine can, a point that matters more every year.

What CRNAs and Anesthesiologists Earn

Anesthesiologists earn more, and the gap is large. The Bureau of Labor Statistics puts the anesthesiologist median near $400,000 a year, and physician compensation surveys run higher: Medscape's 2024 report pegs the average near $472,000. The same Bureau data puts the national average CRNA salary near $232,000. On the headline numbers, an anesthesiologist earns roughly $170,000 to $240,000 more per year.

The CRNA number, though, hides a spread wide enough to close part of that distance. RxRooster's aggregated market data shows New Mexico CRNAs averaging $271 an hour and Wyoming's call-heavy rural schedules pushing annual pay above $430,000. Industry locum data puts the traveling CRNA average near $200 an hour, with the top of that market between $400,000 and $500,000 a year for providers willing to move and work the call. A CRNA at the top of the market can out-earn an anesthesiologist at the median. Geography, practice model, and call burden move the CRNA number more than the title does, and the full range lives in the salary-by-state breakdown.

Who Bills for the Case

Most people assume the bigger paycheck means a bigger bill. It does not. For a solo Medicare case, the anesthesia fee is the same no matter who provides it. Medicare calculates the payment as base units plus time units multiplied by a fixed conversion factor, near $20.50 per unit in 2024. A CRNA working without medical direction bills that full amount under modifier QZ. An anesthesiologist working alone bills the same full amount under modifier AA. The letters on the claim change. The Medicare payment does not.

The economics diverge in two specific places. In the care-team model, an anesthesiologist medically directs one or more CRNAs, and the single case fee splits roughly in half between the physician, who bills under QK, and the nurse, who bills under QX. And on the commercial side, some private payers reimburse a CRNA-only service at a discount to the physician rate. In 2025, UnitedHealthcare moved toward paying CRNA-only claims at 85% of the physician fee, a change anesthesia groups had to model carefully and one that providers are still fighting. The mechanics of all of it are worked out in the breakdown of how anesthesia bills per case, and the policy fight over the discount sits in the analysis of payer reimbursement and equal pay for equal work.

The billing reality reframes the staffing decision. A hospital choosing how to cover its rooms is not weighing two identical line items at two prices. On the Medicare side the case pays the same; the difference is in salary, in the care-team math, and in how a facility builds coverage that holds at three in the morning. That is a data problem, and it is the kind of decision RxRooster exists to inform.

The Care Team and Where the Market Is Heading

The two roles are not drifting apart. They are being pulled together by arithmetic. The demand for anesthesia is rising on a workforce that is aging out faster than it is being replaced. The Bureau of Labor Statistics projects 35% employment growth for nurse anesthetists between 2024 and 2034. The AANA projects a shortage of 12,500 CRNAs by 2033. On the physician side the pressure is sharper still: industry analysis from Stout finds 59% of anesthesiologists are 55 or older, and roughly 30% are expected to retire by 2033.

That math is reshaping how rooms get staffed. Facilities lean harder on the care-team model to extend a shrinking number of physicians across more cases, and they lean harder on independent CRNAs where state law allows it. States keep expanding full practice authority, which widens where a CRNA can work alone and what that work commands. The 2033 shortage forecast is the backdrop for all of it. The question for most facilities is no longer CRNA or anesthesiologist as a matter of preference. It is how to build anesthesia coverage that holds, with the providers the market actually has.

Related reading: what a CRNA is and does, CRNA locum rates in 2026, and CRNA salaries in New Mexico.

The Takeaway

A CRNA and an anesthesiologist do the same work through different training, at different pay, under different billing rules. The patient on the gurney will never see the difference. The hospital, the recruiter, and the insurer see nothing else. In a market short on both, the providers and facilities that know the real numbers, the rates, the practice authority, and who bills what, are the ones negotiating from solid ground.

See the data on RxRooster. Every rate, every state, every credential verified before the first call.

Frequently Asked Questions

What is the difference between a CRNA and an anesthesiologist?

A CRNA is an advanced practice registered nurse and an anesthesiologist is a physician, and both administer the full range of anesthesia. An anesthesiologist trains longer and earns more, while a CRNA practices independently in more than 30 states. The two often work the same case together in a care-team model.

Do CRNAs and anesthesiologists make the same amount of money?

No. Anesthesiologists earn more, with a median near $400,000 a year according to the Bureau of Labor Statistics, against a national CRNA average near $232,000. The gap reflects longer training and broader scope, though top-of-market CRNAs in high-paying states and locum roles can reach $400,000 to $500,000.

Can a CRNA do everything an anesthesiologist does?

A CRNA administers the full range of anesthesia, and there is no category of anesthetic an anesthesiologist provides that a CRNA does not. The practical difference is autonomy and case complexity: CRNAs practice independently in opt-out states, while anesthesiologists bring physician training to the most complex cases and often lead the care team.

Does Medicare pay a CRNA less than an anesthesiologist?

No. For a solo case, Medicare pays the same anesthesia fee whether a CRNA provides it under modifier QZ or an anesthesiologist provides it under modifier AA. The payment splits only in the medical-direction model, where the physician and the CRNA each bill half. Some commercial payers, by contrast, discount CRNA-only claims to about 85% of the physician rate.

Should I become a CRNA or an anesthesiologist?

The choice comes down to the path you want and the years you are willing to invest. Becoming an anesthesiologist takes about 12 to 13 years through medical school and residency; becoming a CRNA takes about 7 to 8 years through nursing, critical care, and a doctoral program. Both lead to one of the best-paid roles in healthcare in a field facing a long-term shortage.