TLDR
A certified anesthesiologist assistant (CAA) is a master's-prepared anesthesia provider who works inside a physician-led care team, always under the medical direction of an anesthesiologist. Roughly 4,000 CAAs practice in 24 US jurisdictions, and their pay rivals nurse anesthetists: salary surveys run from about $206,000 to $290,000 a year. RxRooster, the anesthesia career marketplace, lists CAA positions alongside CRNA and anesthesiologist roles, with the rate visible before the first call.
A certified anesthesiologist assistant (CAA) is a master's-level anesthesia provider who administers anesthesia as part of an anesthesiologist-led care team. CAAs practice in 24 US jurisdictions, earn roughly $206,000 to $290,000 a year by survey, and, unlike CRNAs, always work under physician medical direction. They are the smallest of the three anesthesia provider types, and the one whose map is changing fastest.
At a surgery center on the Missouri side of St. Louis, a CAA finishes her third case of the morning: induction, airway, lines, the long steady middle, a clean emergence. Tomorrow she could drive eight minutes across the Mississippi into Illinois and none of it would count. Not because her skills lapse at the river. Because Illinois has no license for her to hold. Missouri licenses certified anesthesiologist assistants. Illinois does not. The state line is the single most important fact of her career.
Most patients have never heard of her profession, and the arithmetic of anesthesia is pulling it out of obscurity. The American Association of Nurse Anesthesiology projects a shortage of 12,500 CRNAs by 2033. Industry analysis from Stout finds 59% of anesthesiologists are 55 or older, with roughly 30% expected to retire by 2033. Every conversation about anesthesia staffing eventually lands on supply, and CAAs are the third source of it.
What a Certified Anesthesiologist Assistant Does
The clinical day looks like any anesthesia provider's day. A CAA conducts the pre-operative interview, induces the patient, manages the airway, places lines, runs the anesthetic minute by minute, and carries the patient through emergence. Same machines, same monitors, same drugs. The structural difference is not what a CAA does at the head of the table. It is that the work always happens inside a physician-led team. Under the anesthesia care team model, an anesthesiologist medically directs the case while the CAA delivers it, the same arrangement many CRNAs work under in supervision states.
The role is older than its obscurity suggests. The first anesthesiologist assistant programs opened in 1969 at Emory and Case Western Reserve, built by anesthesiologists who wanted a premed-trained provider channeled straight into anesthesia. A CAA is not an anesthesia technician, who prepares equipment but does not deliver anesthetics, and not a physician assistant, who trains across all of medicine. The CAA trains for one room, certified by the National Commission for Certification of Anesthesiologist Assistants and recertified through continuing education and exams.
CAA vs CRNA: Same Room, Different Routes
The comparison everyone reaches for is the nurse anesthetist. In the operating room the two are hard to tell apart. On paper they diverge at almost every line.
| Dimension | CAA | CRNA |
|---|---|---|
| License type | Anesthesiologist assistant (master's) | Advanced practice registered nurse (doctorate) |
| Entry route | Premed-style bachelor's, then MCAT or GRE | Nursing degree, then ICU experience |
| Anesthesia training | 24 to 28 month CAAHEP master's program | About 36 month doctoral program |
| Where they can work | 24 jurisdictions (23 states plus DC) | All 50 states |
| Supervision | Always under anesthesiologist medical direction | Independent in 30-plus opt-out states |
| National pay | About $206,000 to $290,000 by survey | Average about $232,000 (BLS) |
| Solo Medicare billing | Not permitted (no QZ) | Bills 100% of the fee under QZ |
| US workforce | Roughly 4,000 | About 67,700 (BLS) |
The routes in explain most of the table. A CRNA comes up through nursing and the intensive care unit, a path detailed in what a CRNA is and does. A CAA comes up through a premed bachelor's degree, the same coursework that feeds medical school. One profession grew out of nursing's expansion into advanced practice. The other was built by physician anesthesiologists to extend their own model. That origin is why a CAA's autonomy question has a one-word answer: never alone, always directed.
The politics are real, and worth naming plainly. The AANA holds that states facing anesthesia shortages should widen CRNA practice rather than license a new provider type. The American Society of Anesthesiologists and the CAA professional academy back wider CAA licensure. RxRooster takes no side. The market it serves hires both, often into the same care team, and the full three-way picture, including the physician, is mapped in the CRNA vs anesthesiologist comparison.
How to Become a CAA
The path runs about six to seven years. A bachelor's degree with premed coursework, an MCAT or GRE score, and a 24 to 28 month master's program accredited by the Commission on Accreditation of Allied Health Education Programs. Graduates sit the national certifying exam from the NCCAA, then maintain certification through continuing education and periodic assessment.
Compare the clock. A CRNA needs a nursing degree, at least a year of ICU practice, and a doctoral program of about three years, roughly seven to eight years all in, walked through step by step in how to become a CRNA. The CAA route skips the bedside years entirely. For a college junior already deep in organic chemistry, that difference is the recruiting pitch: anesthesia without nursing school first. Program seats remain the bottleneck, though the list of CAAHEP-accredited programs keeps growing, with the newest opening admissions for 2026.
What Anesthesiologist Assistants Earn
The pay surprises people who have never heard of the job. Salary surveys put the average anesthesiologist assistant between $206,000 (Zippia) and $290,000 (Glassdoor) a year, and Becker's reports new-graduate packages averaging about $239,000 in total compensation, with sign-on bonuses near $34,500. Advertised packages at the top of the market cleared $300,000 in late 2025. A new graduate two years out of a master's program can out-earn the national average CRNA, who holds a doctorate.
Benchmark it against the rest of the room. The Bureau of Labor Statistics puts the average CRNA near $232,000 and the anesthesiologist median near $400,000. The CAA number lands beside the CRNA's, which is exactly what the care-team economics predict: two directed providers doing the same case command similar pay. The harder problem is seeing any of these numbers before you commit, since anesthesia postings hide the rate more often than they show it. That opacity, and what it costs a provider, is the subject of the pay transparency breakdown, and closing it is the reason RxRooster shows the rate before the first call.
Where CAAs Can Practice: 24 Jurisdictions and Counting
Geography is the career-defining constraint. CAAs can currently practice in 24 US jurisdictions, 23 states plus the District of Columbia, and the list grew by two in 2025 when Tennessee and Virginia enacted licensure. The roster runs from the profession's Georgia and Ohio heartlands, home to the original programs, through Florida, Missouri, Texas, and the newer additions in Nevada, Utah, and Washington. In a handful of states, including Kansas, Michigan, Pennsylvania, and Texas, CAAs work under physician delegation rather than a dedicated license. California weighed its own CAA bill in 2025. Each session, the map gets a little bigger.
Medicare treats the work the CAA can do exactly like the CRNA's. Under medical direction, the case fee splits 50/50: the anesthesiologist bills modifier QK, and the CAA bills QX, the same modifier and the same half a medically directed CRNA receives. What a CAA cannot do is bill the solo case. The QZ modifier, full fee with no medical direction, belongs to nurse anesthetists alone. For a facility, that means a directed CAA and a directed CRNA are interchangeable on the Medicare claim; the difference appears only where state law lets the CRNA work without the physician. The mechanics live in the guide to how anesthesia bills per case.
For the provider, the map is the strategy. A CAA in Atlanta or Cleveland sits in deep, mature markets. A CAA willing to move early into Tennessee or Virginia enters a state where demand starts at zero supply. And the shortage math, the 12,500-provider gap coming by 2033, guarantees the legislative momentum will not stop at 24.
The Takeaway
A certified anesthesiologist assistant is the third anesthesia provider type: master's-trained, physician-directed, paid beside the CRNA, and licensed in barely half the country. The profession is small, around 4,000 providers, and it is the only one of the three whose practice map grows almost every legislative session. Knowing the role, and where it can work, is now part of understanding the anesthesia market at all.
See the data on RxRooster. Every rate, every state, every credential verified before the first call.
Frequently Asked Questions
What is a certified anesthesiologist assistant?
A certified anesthesiologist assistant (CAA) is a master's-prepared anesthesia provider who administers anesthesia within a physician-led care team, always under the medical direction of an anesthesiologist. CAAs complete a premed-style bachelor's degree and a 24 to 28 month accredited master's program, then certify through the NCCAA. About 4,000 practice in the United States.
What is the difference between a CAA and a CRNA?
A CAA trains through a premed route and a master's program and always works under anesthesiologist medical direction, while a CRNA trains through nursing, holds a doctorate, and practices independently in more than 30 states. CAAs are licensed in 24 jurisdictions; CRNAs work in all 50 states. In the operating room their clinical work is nearly identical, and their pay is comparable.
How much do anesthesiologist assistants make?
Salary surveys put the average anesthesiologist assistant between about $206,000 and $290,000 a year, with Becker's reporting new-graduate packages near $239,000 in total compensation. Advertised packages at the top of the market exceeded $300,000 in late 2025, which places CAA pay beside the national average CRNA salary of about $232,000.
In what states can CAAs practice?
CAAs can practice in 24 US jurisdictions: 23 states plus the District of Columbia. The list includes Georgia, Ohio, Florida, Missouri, Texas, Colorado, North Carolina, Wisconsin, and the 2025 additions Tennessee and Virginia. In a few states, including Kansas, Michigan, Pennsylvania, and Texas, CAAs work under physician delegation rather than a dedicated license, and more states consider CAA bills each session.
How long does it take to become a CAA?
About six to seven years: a four-year bachelor's degree with premed coursework, the MCAT or GRE, and a 24 to 28 month CAAHEP-accredited master's program, followed by the NCCAA certifying exam. The path requires no nursing degree or ICU years, which makes it one to two years shorter than the CRNA route for a student starting from college.