There is no fixed national list of states where CRNAs can practice independently, because independence depends on two legal layers that have to line up: a federal Medicare rule and the state’s own nursing and medical practice laws. A state can be exempt from the federal physician-supervision requirement and still require supervision under its own statutes, and the reverse is also possible. To know whether a Certified Registered Nurse Anesthetist can work without physician oversight in a given state, you have to check both.
The Federal Opt-Out
Hospitals and surgical centers that participate in Medicare must follow the Medicare Conditions of Participation. One of those conditions requires that a CRNA administering anesthesia be supervised by the operating practitioner or by an anesthesiologist.1GovInfo. 42 CFR § 482.52
The federal rule lets a state be exempt from that supervision requirement. The exemption is commonly called the opt-out. To take it, the governor sends a letter to the Centers for Medicare and Medicaid Services confirming that the state’s boards of medicine and nursing have been consulted, that opting out is in the best interest of the state’s citizens, and that the exemption is consistent with state law.1GovInfo. 42 CFR § 482.52 The research file does not name which states have opted out, so confirm current status with CMS directly before relying on it.
State Law Still Controls
This is the point most readers miss. A federal opt-out does not override state scope-of-practice limits. If the state’s nursing or medical practice act still requires physician supervision or a collaborative practice agreement, CRNAs in that state must follow those rules whether or not the governor has sent an opt-out letter. Independence exists only where state law also permits a CRNA to administer anesthesia without supervision or a formal collaboration arrangement.
That is why “independent practice” is not a single legal term that travels cleanly across state lines. The specific legal requirements live in each state’s statutes and board regulations, and those rules change. Crossing a state border can change what a CRNA is allowed to do, even when the clinical work is identical.
Facility Policies Add a Third Layer
Even where state law and federal rules both permit unsupervised CRNA practice, individual hospitals and surgical centers can impose supervision through their own bylaws and internal policies. A CRNA working at a facility with a supervision policy is bound by that policy regardless of the state’s legal status.
How to Confirm the Rule for a Specific State
Check three sources in order. First, the state board of nursing’s current scope-of-practice rules for CRNAs. Second, the state’s medical practice act, which may impose supervision or collaboration requirements from the physician side. Third, CMS’s current list of states that have exercised the opt-out under 42 CFR § 482.52. If you work in or contract with a specific facility, add its medical staff bylaws to that list. Only when all of the applicable layers permit unsupervised practice can a CRNA actually practice independently in that setting.