Nurse practitioners can diagnose conditions, prescribe medications, and manage patient care independently in many states, but there are clear boundaries on what they’re allowed to do. Those boundaries shift depending on where they practice, what specialty they work in, and whether their state requires physician oversight. Here’s a practical breakdown of the limitations.
Surgery Is Off the Table
NPs cannot perform complex surgical procedures. Even in states that grant full independent practice authority, surgical restrictions remain firm. Florida law, for example, specifies that an NP in autonomous practice “may not perform any surgical procedure other than a subcutaneous procedure,” meaning only minor skin-level work like removing a mole or inserting an implant just beneath the skin. Anything deeper, from orthopedic repairs to cardiac surgery to appendectomies, requires a physician.
Prescribing Power Varies by State
NPs can prescribe medications in all 50 states, but the details vary widely. The biggest differences involve controlled substances, the category that includes opioids, stimulants, and certain sedatives. In Alabama, NPs can only prescribe Schedule III through V controlled substances (moderate-strength painkillers, sleep aids, and similar drugs) and are locked out of Schedule II drugs like oxycodone and Adderall entirely. Other states, like those granting full practice authority, allow NPs to independently prescribe Schedule II through V controlled substances without a physician’s approval.
In states with restricted authority, the collaborating physician may need to sign off on the drug type, dosage, quantity, and number of refills according to a pre-approved protocol. This can slow down care for patients who need certain medications quickly.
Physician Oversight Requirements
About half of U.S. states still require NPs to work under some form of physician supervision or a collaborative practice agreement. What that looks like in practice ranges from a loose phone-consultation arrangement to mandatory on-site physician presence.
In Alabama, the collaborating physician must be physically present for at least 10% of the NP’s scheduled hours and visit each practice site quarterly. In Missouri, the physician must be immediately available for consultation at all times and must review the NP’s work and records at least every two weeks. These agreements also cap how many NPs a single physician can oversee. Alabama and Missouri limit it to three full-time equivalents per physician. New York caps it at four NPs who aren’t on the same physical premises as the collaborating doctor.
These ratios create a practical ceiling. In rural or underserved areas, the requirement to find a willing collaborating physician can limit where NPs are able to open practices at all.
Paperwork Only a Physician Can Sign
One of the less obvious restrictions involves legal and administrative documents. In states without “global signature” laws, NPs are often blocked from signing forms that patients assume any healthcare provider could complete. These include:
- Death certificates
- Disability certifications for parking permits or placards
- Sports physicals authorizing students to play
- Commercial driver physicals for bus drivers
- Do-not-resuscitate orders
- Workers’ compensation forms
- Jury duty medical excuses
- Authorizations for durable medical equipment like wheelchairs or hospital beds
This means a patient who sees only an NP may still need to schedule a separate visit with a physician just to get a form signed. Some states have fixed this by passing laws that accept NP signatures on these documents, but many haven’t.
Interpreting Imaging and Providing Anesthesia
NPs can order X-rays, MRIs, and other imaging studies, and they can use the results to guide treatment decisions. But formally reading and interpreting those images is reserved for credentialed radiologists. When the VA expanded full practice authority for NPs, it explicitly clarified that the rule meant NPs could “order laboratory and imaging studies and integrate the results into clinical decision making,” not perform or formally interpret the scans themselves.
Anesthesia is another restricted area. Certified Registered Nurse Anesthetists (CRNAs) are a separate category of advanced practice nurse with specialized training, and even they were excluded from the VA’s full practice authority expansion. In many settings, nurse anesthetists work under physician supervision, and NPs without CRNA credentials cannot administer anesthesia or provide deep sedation at all.
The Training Gap Behind These Limits
The restrictions on NP practice reflect a significant difference in clinical training hours. According to the American Medical Association, NPs complete 500 to 750 hours of patient care during their training programs. Physicians, between medical school clinical rotations and residency, accumulate 12,000 to 16,000 hours. That’s roughly 16 to 32 times more hands-on clinical experience before independent practice.
This gap is the core reason NPs face scope-of-practice limits, particularly around complex procedures, high-risk prescribing, and formal diagnostic interpretation. NP programs are designed to produce skilled primary care and specialty providers, not to replicate the full breadth of physician training.
Lower Medicare Reimbursement Rates
NPs also face a financial limitation that indirectly affects patients. Medicare reimburses NP services at 85% of the physician fee schedule when care is provided outside a hospital or skilled nursing facility. This means an NP performing the exact same office visit as a physician generates less revenue for the practice. While this doesn’t change the quality of your visit, it shapes where NPs work and what services practices are willing to have them provide. Some clinics work around this by having NPs bill “incident to” a supervising physician’s services, which pays at the full physician rate but requires on-site physician presence.
How Restrictions Differ Across States
The single biggest factor determining what your NP can and can’t do is geography. States fall into three general categories: full practice authority, reduced practice, and restricted practice. In full practice states, NPs can evaluate patients, diagnose, order tests, prescribe all levels of controlled substances, and manage treatment without any physician involvement. In restricted states like Alabama and Missouri, nearly every clinical decision flows through a collaborative agreement with a physician who must actively review the NP’s work.
Florida adds another layer of complexity by limiting the number of satellite offices a supervising physician can oversee. A physician supervising NPs providing primary care can cover up to four satellite locations. For specialty services, that drops to two. For dermatologic care specifically, it’s just one additional location beyond the physician’s primary office. These caps mean that even when NPs are fully qualified to see patients, the logistics of physician supervision can restrict how many locations offer NP-led care.