What Is a Nurse Practitioner (NP)?

A nurse practitioner (NP) is an advanced practice registered nurse (APRN) who provides direct patient care, including diagnosing conditions, ordering and interpreting tests, and prescribing medications. NPs work in primary care, acute care, and specialty settings, and their exact level of independence depends on the state where they practice. If you're choosing a provider or considering the career, the key variables are your state's practice rules, the NP's certification and specialty, and the setting they work in.

How the NP role differs from RN and physician roles

The practical difference for patients is that an NP can often serve as your main provider for routine and chronic care, while a physician handles cases requiring their broader and deeper training. NPs frequently work collaboratively with physicians, and in some states that collaboration is legally required.

Scope of practice and prescriptive authority

Scope of practice for NPs is set at the state level, so the same NP credential can mean different things depending on location. States generally fall into three broad models:

• Full practice authority — NPs can evaluate, diagnose, treat, and prescribe without physician supervision or a collaborative agreement.
• Reduced practice — NPs need a collaborative agreement or physician oversight for some elements of practice, often including prescribing.
• Restricted practice — the most physician oversight, with limits on at least one element of practice.

Prescriptive authority follows the same state-by-state pattern. Most NPs can prescribe medications, but whether a collaborative agreement, a formulary limit, or a supervision requirement applies depends on the state and, in some cases, the practice setting. Because these rules change, check your state board of nursing or the AANP state practice environment resources rather than relying on a general summary.

Education, certification, and specialties

The path to becoming an NP typically runs: RN licensure, then a graduate degree (master's or doctoral) in an NP track, then national certification in that population focus, then state licensure as an APRN. Common NP specialties include:

• Family — care across the lifespan, often in primary care
• Adult-gerontology primary or acute care — adults and older adults, with acute care focused on hospital and complex settings
• Pediatric — infants through young adults
• Psychiatric-mental health — mental health assessment and treatment
• Women's health — reproductive and gynecologic care
• Neonatal — newborns and infants, typically in acute settings

Certification is tied to the population focus, so an NP's credential tells you which patients they are trained and certified to treat.

When you can choose an NP for your care

You can generally see an NP for primary care, chronic condition management, urgent care, and many specialty services. Choosing an NP is a reasonable option when:

• You need a primary care provider and want appointment availability or a specific practice style.
• You're managing an ongoing condition and want a provider focused on longitudinal care.
• You're in a state with full practice authority and want a provider who can prescribe and treat without a separate physician sign-off.

You may prefer a physician when your case is highly complex, requires procedures outside an NP's certification, or when your state's rules require physician involvement for a decision you need.

How AANP fits in

The American Association of Nurse Practitioners (AANP) describes itself as the largest and only full-service national professional membership organization for NPs of all specialties. Its stated work includes supporting NPs across practice areas, advocating to remove barriers and secure full and direct access to NP services, and providing education and clinical resources. AANP also publishes practice information by state, which is a practical starting point if you want to check how NPs practice where you live.