Nurse practitioners can practice independently in 28 states and Washington, D.C., while physician assistants still require some form of physician relationship in most of the country. The gap comes down to how each profession was created, who regulates them, and how their professional organizations have pursued autonomy through different legal strategies.
Different Professions, Different Origins
Both NPs and PAs emerged in the 1960s to address the same problem: not enough healthcare providers, especially in underserved communities. But they grew out of very different professional roots, and those roots still shape how state laws treat them today.
Nurse practitioners evolved from nursing. Their training is built on what’s called the nursing model, which emphasizes holistic, patient-centered care, tracing the source of a health problem through medical history, lifestyle, mental well-being, and other contributing factors. NPs earn graduate degrees (master’s or doctoral) through nursing schools and are licensed by state boards of nursing. Their entire professional identity is rooted in nursing’s long tradition of autonomous patient care.
Physician assistants were designed from the start as extensions of physicians. The PA profession grew through existing medical education programs and federal health initiatives, and early PAs were often associated with returning Vietnam War veterans who had medical training from military service. Their education follows the medical model, which centers on diagnosis and treatment. PAs are certified through the National Commission on Certification of Physician Assistants and regulated, in most states, by medical boards rather than their own independent licensing boards. That structural connection to medicine has made it legally harder to separate PAs from physician oversight.
Who Controls the License Matters
This is one of the most important and least obvious reasons for the gap. NPs are regulated by state boards of nursing. PAs are typically regulated by state medical boards, the same boards dominated by physicians. That distinction has enormous practical consequences for legislation.
When NP advocates push for full practice authority, they’re asking a nursing board to expand the scope of a nursing license. The decision stays within the nursing profession’s own regulatory structure. When PA advocates push for independence, they’re often asking a medical board, one controlled by physicians, to loosen its own oversight of PAs. That’s a much harder political lift.
The American Academy of Physician Associates (AAPA) has recognized this problem. Their policy framework calls for creating separate majority-PA boards to regulate PAs, or at minimum adding PAs and PA-collaborating physicians to existing medical or healing arts boards. But in most states, that structural change hasn’t happened yet.
Full Practice Authority vs. Optimal Team Practice
The two professions have even pursued autonomy using different language and frameworks, reflecting their different positions.
For NPs, the goal is Full Practice Authority (FPA). Under FPA laws, NPs can evaluate patients, diagnose conditions, order and interpret tests, prescribe medications including controlled substances, and open their own practices, all under the exclusive authority of the state board of nursing with no physician involvement required.
PAs have pursued something called Optimal Team Practice (OTP). Rather than framing their goal as “independence,” the AAPA advocates for eliminating the legal requirement for a specific relationship between a PA and a physician. The distinction is subtle but important: OTP envisions PAs practicing to the full extent of their training while remaining part of a collaborative team, just without the burdensome administrative requirements like mandatory supervision agreements, weekly meetings with a supervising physician, or chart review quotas. Under OTP, PAs would be fully responsible for the care they provide, but the framework deliberately avoids the word “independent.”
This difference in messaging reflects political reality. Because PAs were built as physician-adjacent professionals, claiming full independence would face even stiffer opposition from physician lobbying groups. The team-based framing is a strategic choice.
Where Things Stand Now
NPs have made significant legislative progress. Twenty-eight states and territories plus Washington, D.C. grant full practice authority. Another 15 states have “reduced” practice environments where NPs need some form of collaboration but not direct supervision. Only 11 states still require physician supervision for NPs.
PAs have moved more slowly, but the landscape is shifting. North Carolina became the largest state to remove supervision requirements for experienced PAs, passing a Team-Based Practice Act that eliminates the mandatory physician relationship for PAs with at least 4,000 clinical hours of experience. Several other states have made similar moves, though most still require collaborative agreements or direct supervision. The requirements vary widely: some states mandate weekly meetings between a PA and their supervising physician, others require only monthly contact, and some simply require that a collaborative practice agreement exists on paper.
The Title Change Factor
One underappreciated barrier for PAs has been the word “assistant” in their title. The AAPA has been pushing to officially change the professional title from “physician assistant” to “physician associate,” arguing that the old title creates a misperception that PAs merely assist physicians rather than providing care independently. Several states have already adopted the new title through legislation.
The title change is more than branding. It’s part of a broader strategy to reshape how legislators, patients, and other healthcare professionals understand the PA role. When your professional title literally contains the word “assistant,” making a legislative case for practicing without supervision becomes a harder argument. The new title is meant to signal that PAs are trained clinicians who diagnose, treat, and prescribe, not helpers handing instruments to a doctor.
Why the Gap Is Narrowing
The practical difference between what NPs and PAs actually do in a clinic is often minimal. Both take patient histories, perform exams, diagnose conditions, develop treatment plans, and prescribe medications. Both complete graduate-level education, pass national certification exams, and maintain their credentials through continuing education. The gap in legal authority has more to do with professional politics, regulatory structure, and historical framing than with clinical capability.
The PA profession is increasingly adopting strategies that mirror the NP playbook: pushing for independent regulatory boards, rebranding the professional title, and passing state-level legislation that removes supervision mandates. North Carolina’s law requiring 4,000 hours of clinical experience before unsupervised practice represents a middle-ground approach that may become a model for other states, granting autonomy while building in an experience threshold that addresses safety concerns. The trajectory for both professions points toward more independence, but NPs had a 20-year head start in the legislative race, and their regulatory structure gave them a clearer path to get there.