A physician associate (PA) is a licensed medical professional who holds a master’s degree and provides direct patient care, including diagnosing illnesses, prescribing medications, and assisting in surgery. PAs work alongside physicians in virtually every medical specialty, from primary care to emergency medicine to orthopedics. The role sits between a registered nurse and a physician in terms of training length, but PAs practice medicine using the same diagnostic framework doctors use.
What PAs Do Day to Day
PAs see patients, make diagnoses, and manage treatment plans. On a typical day, that means performing physical exams, ordering and interpreting lab work and imaging, prescribing medications, counseling patients on preventive care, and developing long-term treatment strategies. In surgical settings, PAs assist during operations. In primary care, they often serve as the main provider a patient sees for routine visits, sick appointments, and chronic disease management.
The scope of practice is broad enough that PAs treat patients of all ages across nearly every area of medicine. Unlike physicians, PAs historically practiced under a collaborative or supervisory agreement with a doctor, though several states have moved toward granting PAs more independent authority in recent years.
Education and Training
Becoming a PA requires a master’s degree from an accredited PA program, which typically takes about two to three years of full-time study. Before applying, candidates need a bachelor’s degree, usually in a science or health-related field, plus direct patient care experience.
PA programs follow a medical model of education, meaning students learn the same way doctors do: studying anatomy, pharmacology, pathophysiology, and clinical medicine, then applying that knowledge in supervised clinical rotations. The clinical phase alone requires more than 1,600 hours of hands-on training across disciplines like family medicine, internal medicine, surgery, emergency medicine, pediatrics, women’s health, and behavioral medicine.
In the UK, PA training is a postgraduate program of at least 90 weeks over two years. A study published in MedEdPublish found that PA students’ knowledge scores improved at a faster rate per training stage than medical students’ scores, reflecting the compressed, intensive nature of PA education. That said, the total training period is significantly shorter. Medical school in the UK spans five years before foundation training, while in the US, physicians complete four years of medical school followed by three to seven years of residency.
Certification and Licensure
After graduating from an accredited program, PAs must pass the Physician Assistant National Certifying Examination (PANCE), administered by the National Commission on Certification of Physician Assistants (NCCPA). This exam tests clinical knowledge, reasoning, and the professional skills needed for entry-level practice. Passing it earns the PA-C credential (Physician Assistant-Certified), which is required for licensure in all US states.
Certification isn’t a one-time event. PAs must maintain their certification through ongoing continuing education and periodic recertification to keep their license active.
Specialization Options
PAs can work in any specialty without additional certification, but those who want formal recognition of their expertise can earn a Certificate of Added Qualifications (CAQ) through the NCCPA. Specialty certificates are currently available in cardiovascular and thoracic surgery, dermatology, emergency medicine, geriatric medicine, hospital medicine, nephrology, obstetrics and gynecology, occupational medicine, orthopedic surgery, palliative medicine and hospice care, pediatrics, and psychiatry.
These certificates signal advanced knowledge in a specific field but aren’t required to practice in that specialty. Most PAs specialize simply by working in a particular area and gaining experience over time.
Prescribing Medications
PAs can prescribe medications in all 50 US states, but the rules vary when it comes to controlled substances. Most states allow PAs to prescribe Schedule II through V drugs (which include opioids, stimulants, and other controlled medications) with some restrictions. Georgia and Texas, for example, prohibit PAs from prescribing Schedule II substances entirely, though they can prescribe Schedule III through V drugs. Arkansas and Missouri only allow PAs to prescribe certain hydrocodone combination products from the Schedule II list.
Even in states where Schedule II prescribing is permitted, there are often limits. Arizona, Illinois, Montana, North Carolina, Pennsylvania, and South Dakota cap Schedule II prescriptions at a 30-day supply. Florida limits them to a 7-day supply. Some states require PAs to complete board-approved courses on controlled substance prescribing before they can write these prescriptions at all, and several states maintain formularies listing specific drugs PAs cannot prescribe, such as general anesthetics or psychiatric medications for minors.
How PAs Differ From Doctors
The biggest difference is training duration. A PA completes roughly six to seven years of post-secondary education (four years of undergraduate study plus two to three years of PA school). A physician completes 11 to 15 years (four years of undergraduate, four of medical school, and three to seven of residency). Physicians also undergo more specialized training in their residency, which gives them deeper expertise in a single area of medicine.
In clinical practice, the overlap is significant. PAs diagnose, treat, and prescribe using the same medical knowledge base. The key structural difference is that PAs in most states work within a collaborative relationship with a physician, while doctors practice independently. For patients, the experience of seeing a PA versus a doctor for a routine visit or common illness is often very similar.
How PAs Differ From Nurse Practitioners
PAs and nurse practitioners (NPs) perform many of the same clinical tasks, but their training philosophies differ. PA education follows a medical model: it focuses on the biology of disease, identifying what’s going wrong in the body, and treating the pathology directly. NP education follows a nursing model, which places more emphasis on how illness affects the whole patient, including their quality of life, family dynamics, and cultural context, alongside diagnosis and treatment.
In practice, the outcomes of both approaches are similar for most patient encounters. The difference shows up more in educational philosophy than in what either provider does in an exam room. Both can diagnose, prescribe, and manage treatment plans. NPs must first earn a nursing degree and become registered nurses before pursuing advanced practice training, while PAs enter their programs from a broader range of science backgrounds.
The Name: “Associate” vs. “Assistant”
You may see the terms “physician assistant” and “physician associate” used interchangeably. In 2021, the American Academy of Physician Associates voted to change the profession’s official title from “physician assistant” to “physician associate,” dropping the word “assistant” to better reflect the collaborative nature of the role. However, the legal title in most states remains “physician assistant” until individual legislatures update their laws. The AAPA itself has noted that PAs should not use the “physician associate” title in clinical practice until the necessary regulatory changes are in place. The transition is ongoing, and both terms currently refer to the same profession.
Salary and Job Outlook
The median annual salary for PAs was $133,260 as of May 2024, according to the Bureau of Labor Statistics. Employment is projected to grow 20 percent between 2024 and 2034, adding roughly 33,200 new positions and bringing the total to nearly 196,000 PAs nationwide. That growth rate is much faster than the average for all occupations, driven by an aging population, expanding healthcare access, and the cost-effectiveness of using PAs to deliver care that would otherwise require a physician.