Types of Primary Care Providers: MDs, DOs and APPs

Choosing a primary care provider can feel confusing when you see so many titles and credentials. From understanding the doctor definition to knowing the difference between a doctor of medicine (MD), a doctor of osteopathic medicine (DO) or an advanced practice provider (APP), people often search online for clear, simple answers. Primary care is usually your first stop for care, helping you stay healthy, manage chronic conditions and decide when to see a specialist. This guide breaks down the most common doctor types and other healthcare providers you may see in primary care, explains physician meaning and answers common questions like “What do doctors do?” and “Is a nurse practitioner a doctor?” in a way that’s easy to understand.

“Each team member brings different skills and attributes from their training,” said Melinda Cooling, OSF HealthCare, vice president of advanced practice providers.

What does a physician do?

A physician is a medical professional who diagnoses, treats and helps prevent illness. The meaning between doctor and physician often overlaps, but there are differences in training and roles.

In general, physicians:

• Listen to your concerns and symptoms
• Order and interpreting tests
• Diagnose conditions
• Create treatment plans
• Help you stay well with preventive care

Types of Medical Doctors in Primary Care

When people look up types of medical doctors or types of doctors, they’re usually referring to physicians who have completed medical school and residency training.

What is an MD?

An MD is a medical doctor who earned a doctor of medicine degree. MDs are trained using a conventional approach, focusing on diagnosing disease and treating it with evidence-based medicine, medications and procedures. In primary care, MDs commonly serve as family medicine doctors or internal medicine doctors.

What is a DO?

A DO is a physician who earned a doctor of osteopathic medicine degree. A DO doctor receives the same core medical training as an MD, with additional education in a whole-person, body-and-mind approach to care.

A DO does the same thing an MD does in primary care: diagnosing, treating and preventing illness. Both MDs and DOs can prescribe medication, perform procedures and refer you to specialists.

Primary Care vs. Specialists

Primary care providers focus on your overall health across your lifespan. They can coordinate your care and help decide when you need a specialist.

Primary care typically includes:

• Family medicine
• Internal medicine
• Pediatrics

Specialists focus on one area of the body or a specific condition, such as cardiology or orthopedics. While it can feel like there are 100 different types of doctors when you’re trying to find care, the key difference you should pay attention to when choosing a doctor is whether the provider offers broad, ongoing care or specialized treatment for one problem.

Advanced Practice Providers in Primary Care

In addition to physicians, many primary care teams include advanced practice providers. APPs are highly trained clinicians who help improve access to care, reduce wait times and ensure patients get the right care at the right time. They work as part of a coordinated care team, often serving as a patient’s regular primary care provider or seeing patients for same‑day and follow‑up visits.

APPs also focus on whole‑person care and spend time listening to patients, answering questions and helping manage both short‑term concerns and ongoing health needs. In primary care settings, the most common APPs are advanced practice registered nurses (APRNs) and physician assistants (PA).

“APPs can reduce access time for patients,” Melinda said. “Thanks to their training and skillset, APPs are meeting the growing needs of our population.”

Is a nurse practitioner a doctor?

Nurse practitioners are not physicians, but they are APRNs with graduate‑level education and extensive clinical training. APRNs often choose a specialty focus, such as family medicine, adult care or pediatrics, which prepares them to care for patients across many stages of life.

Nurse practitioners can:

• Diagnose and treat illnesses
• Prescribe medications
• Order and interpret lab tests and imaging
• Provide preventive care, including screenings and wellness visits
• Focus on health education, lifestyle changes and disease prevention

Depending on state regulations and the care setting, nurse practitioners may practice independently or in collaboration with physicians. In both models, they work closely with the rest of the care team to ensure patients receive safe, coordinated and skilled care.

Physician Assistants

PAs are another essential part of the primary care team. PAs complete advanced medical training and practice medicine in collaboration with physicians. In primary care, they often serve as a patient’s main point of contact for routine visits and ongoing care.

Physician assistants can:

• Perform physical exams
• Diagnose and manage common health conditions
• Develop and adjust treatment plans
• Prescribe medications
• Order tests and review results with patients

By working alongside physicians, nurse practitioners and other care team members, PAs help ensure patients receive timely, comprehensive care while maintaining strong relationships with their providers. This team‑based approach allows primary care practices to meet patients’ needs more effectively and support better long‑term health outcomes.

Choosing the Right Primary Care Provider for You

Whether your provider is an MD, DO, nurse practitioner or PA, the most important factor when choosing a care team is finding someone you trust. Primary care providers work together as a team, focusing on your whole health, not just one symptom.

Understanding the different doctor types and health care providers can help you feel confident in your care and know who to turn to when health questions come up.