Decoding Credentials In Primary Care – Board-Certified, Fellowship-Trained, DO Vs MD, And Certified NPs In Plano

When you search for a primary care provider in Plano, you’ll see a lot of letters after each clinician’s name: MD, DO, NP, PA, “board‑certified,” “fellowship‑trained,” FNP‑C or FNP‑BC.

This guide breaks down what those credentials actually mean and shows how they show up across Catalyst Physician Group’s Plano‑area clinics, including Catalyst Physician Group – West Plano, Catalyst Physician Group – Independence, and Catalyst Physician Group Pediatrics – West Plano. The goal: help you choose a provider whose training, experience, and communication style are the right fit for you.

Catalyst Physician Group is a physician‑owned, physician‑led primary care organization with more than 120 providers and 500 employees across 21 Texas locations, including multiple practices in Plano.

Why Credentials Matter In Primary Care

Any licensed clinician in Texas has met minimum requirements to practice safely. But credentials like board certification, fellowship training, and national NP/PA certification signal additional depth of training and ongoing commitment to staying current.

For physicians, board certification is an independent evaluation of knowledge, skills, and professionalism beyond the state medical license. The American Board of Medical Specialties (ABMS) describes board certification as a way to show that a doctor has completed accredited residency training in a specialty and passed rigorous exams, with ongoing learning over time.

In primary care, the most common boards are:

•   Family Medicine – American Board of Family Medicine (ABFM) or an osteopathic family medicine board
•   Internal Medicine – American Board of Internal Medicine (ABIM)
•   Pediatrics – American Board of Pediatrics (ABP) or the American Osteopathic Board of Pediatrics

ABFM, for example, certifies more than 100,000 family physicians and emphasizes up‑to‑date, comprehensive care “from newborns to older adults.” ABIM and ABP play a similar role for internal medicine and pediatrics.

For advanced practice clinicians such as nurse practitioners (NPs) and physician assistants/associates (PAs), national certification verifies graduate‑level education and passing a standardized exam in their specialty area.

MD Vs DO Two Paths Same Level Of Physician Training

You’ll see both MD and DO after physicians’ names at Catalyst Physician Group’s Plano clinics.

•   MD stands for Doctor of Medicine and reflects training in what’s often called allopathic medicine
•   DO stands for Doctor of Osteopathic Medicine and reflects training in osteopathic medicine, which adds a focus on the musculoskeletal system and “whole‑person” care

Despite the different letters, MDs and DOs in the United States:

•   Complete 4 years of accredited medical school
•   Complete residency training in a specialty (such as family medicine, internal medicine, or pediatrics)
•   Take national licensing exams
•   Can pursue the same residencies and subspecialty fellowships

Cleveland Clinic notes that the core training and licensing standards for MDs and DOs are comparable, and both can practice in any medical specialty. DO programs add roughly 200 hours of education in osteopathic manipulative treatment (OMT), but in everyday primary care most patients won’t notice a difference in how MDs and DOs care for them.

At Catalyst Physician Group in Plano, you’ll find both MD and DO primary care physicians, each board‑certified in their specialty:

•   Zachary Castle, MD – Board‑certified family medicine physician with a Doctor of Osteopathic Medicine degree, at Catalyst Physician Group – West Plano.
•   Greg Ennis, MD; Ryan Hewitt, MD; John Moon, MD – Board‑certified family medicine physicians with Doctor of Medicine degrees, at Catalyst Physician Group – West Plano.
•   Douglas Fullington, MD – Board‑certified internal medicine physician with a Doctor of Medicine degree, at Catalyst Physician Group – Independence in Plano.
•   Diana Roy, MD – Board‑certified family medicine physician with a Doctor of Osteopathic Medicine degree, at Catalyst Physician Group – Independence.

If you’ve been specifically searching for “a Plano primary care physician who is a DO,” you have several options within a physician‑led group that also includes MD colleagues.

Board‑Certified In Family Medicine Internal Medicine Or Pediatrics

You’ll see phrasing like “I am a board‑certified physician in family medicine with more than 20 years of experience” throughout Catalyst Physician Group’s provider bios.

Here’s what that generally means:

1. The doctor completed an accredited residency in their specialty (e.g., family medicine, internal medicine, pediatrics)
2. They passed a comprehensive board exam that tests current, evidence‑based knowledge
3. They maintain certification through continuing education and, for many boards, periodic recertification exams or other assessments

ABMS describes board certification as a way to show ongoing competence in six core areas: patient care, medical knowledge, professionalism, interpersonal and communication skills, practice‑based learning and improvement, and systems‑based practice. ABFM emphasizes that its certification gives patients confidence that a family physician is held to “the highest standard of knowledge, skills, and ethics.”

At Catalyst Physician Group’s Plano locations, examples include:

•   Family medicine in Plano

○   Zachary Castle, MD,  Greg Ennis, MD, Ryan Hewitt, MD, and John Moon, MD – all describe themselves as board‑certified family medicine physicians at Catalyst Physician Group – West Plano, a comprehensive primary care clinic at 5655 W Spring Creek Pkwy in Plano.

○   At Catalyst Physician Group – Independence (8080 Independence Pkwy), physicians such as Keith Eppich,MD, Greg Lensing, MD, Hasan Syed, MD, Samiksha Shah, MD, Todd Wien, MD, and Lauren Woolbert, MD are also board‑certified in family medicine, providing full‑spectrum primary care for adults and children.

•   Internal medicine in Plano

○   Douglas Fullington, MD is a board‑certified internal medicine physician at Catalyst Physician Group – Independence. His training focuses on adult medicine and complex chronic disease management—ideal if you have multiple conditions such as diabetes, heart disease, or autoimmune issues.  This aligns with ABIM’s mission to improve adult health by certifying internists who demonstrate the knowledge and attitudes essential for excellent care.

•   Pediatrics in Plano

○   At Catalyst Physician Group Pediatrics – West Plano, board‑certified pediatrician Malini Hebbur, MD care for children from birth through adolescence, offering wellness visits, sports physicals, sick visits, immunizations, behavioral health support, and more.

For searches like “schedule a wellness exam with a Plano primary care doctor who is a certified internist” or “find a Plano primary care provider with pediatric experience and board certification,” these are the kinds of credentials and bios to look for.

Fellowship‑Trained Extra Depth In Sports Medicine And Beyond

After residency and initial board certification, some primary care doctors complete a fellowship—usually one additional year focused on a subspecialty such as sports medicine, geriatrics, adolescent medicine, or advanced heart disease prevention.

Boards like ABFM formally recognize additional qualifications in areas such as Sports Medicine and Adolescent Medicine, reflecting extra training and assessment beyond standard family medicine residency.

Within the Catalyst Physician Group network, a key example relevant to active patients in the Plano–Richardson area is:

•   Bryan McGee, MD – Fellowship‑trained sports medicine

McGee, MD is a board‑certified family medicine physician and primary care sports medicine specialist at Catalyst Physician Group – Richardson. His bio notes that he is fellowship trained in diagnosing and treating musculoskeletal injuries, performing musculoskeletal procedures, and using diagnostic ultrasound, and he serves as a team physician for the Lone Star Brahmas ice hockey team.

For an athlete or weekend warrior searching for “a primary care provider with a background in sports medicine,” this type of fellowship‑trained, board‑certified DO can provide both routine primary care and advanced non‑surgical sports injury management.

Even if you receive your routine care at a Plano clinic, it’s helpful to know that sports‑focused expertise is available nearby within the same physician‑led group.

Certified NPs And PAs How Advanced Practice Clinicians Fit Into Primary Care

Nurse Practitioners (NPs)

Nurse practitioners are advanced practice registered nurses (APRNs) who have completed graduate‑level education—typically a master’s or Doctor of Nursing Practice (DNP) degree—and hold national certification in a specific role and population focus (such as family nurse practitioner).

In primary care, Family Nurse Practitioners (FNPs) are most common. In the U.S., FNPs are board‑certified either through:

•   American Nurses Credentialing Center (ANCC) – grants the FNP‑BC credential via a competency‑based board exam.
•   American Academy of Nurse Practitioners Certification Board (AANPCB) – grants the FNP‑C credential after a national exam.

The Texas Board of Nursing has required current national certification as a condition for APRN licensure since 1996, meaning Texas NPs must keep a national NP certification current to be licensed as APRNs in the state.

In practice, that means when you see “board‑certified family nurse practitioner” on a Plano provider’s bio, you’re looking at a clinician who:

•   Completed an accredited graduate NP program
•   Passed a national FNP certification exam
•   Maintains certification and state APRN licensure with continuing education

At Catalyst Physician Group’s Plano‑area clinics, examples include:

•   Amy Hicks, NP – Board‑certified family nurse practitioner at Catalyst Physician Group – West Plano.
•   Sandra Portales, NP – Board‑certified family nurse practitioner at Catalyst Physician Group – West Plano, fluent in English and Spanish.
•   Rebekah Ellis, NP and Kristin Kim, NP – Board‑certified family nurse practitioners at Catalyst Physician Group – Independence in Plano.

For queries like “primary care in Plano accepting new patients with certified nurse practitioners” or “Plano primary care clinics with nurse practitioners holding national certification,” these bios are exactly what to look for.

Physician Assistants / Physician Associates (PAs)

Physician assistants (often now called physician associates or “PAs”) are graduate‑trained clinicians who practice medicine on a team with physicians. PAs complete an accredited PA program (usually at the master’s level) and must pass the Physician Assistant National Certifying Exam (PANCE) to earn the PA‑C credential and state licensure.

At Catalyst Physician Group – West Plano, for example:

•   Shelley Loomstein, PA is a board‑certified physician assistant with more than 15 years of experience in family medicine.

Together, board‑certified MDs/DOs, NPs, and PAs form a team‑based primary care model—you may see your physician for annual physicals and complex issues, and an NP or PA for follow‑ups, same‑day sick visits, or chronic‑condition check‑ins.

Bilingual Board‑Certified Care For Plano’s Diverse Community

North Texas is linguistically and culturally diverse, and many families prefer primary care in their preferred language.

At Catalyst Physician Group’s Plano and nearby locations, you’ll find board‑certified clinicians who are also bilingual or multilingual, including:

•   Keith Eppich, MD – Board‑certified family medicine physician at Catalyst Physician Group – Independence who speaks English and Spanish.
•   Sandra Portales, NP – Board‑certified family nurse practitioner at Catalyst Physician Group – West Plano, fluent in English and Spanish.
•   Malini Hebbur, MD – Board‑certified pediatrician at Catalyst Physician Group Pediatrics – West Plano who speaks English, Kannada, and Telugu.
•   Kishore Gadikota, MD – Board‑certified pediatrician currently practicing at Catalyst Physician Group Pediatrics – Frisco; he speaks English, Telugu, Tamil, and Hindi and has hospital affiliation with Texas Health Plano.
•   Young‑Jee Jung, MD – Board‑certified family medicine physician at Catalyst Physician Group – Richardson who speaks English and Korean and focuses on preventive, whole‑person care for patients of all ages.

If you’ve been looking for “Plano primary care clinics with bilingual board‑certified providers,” these examples show how language skills and high‑level credentials come together in one care team.

Hospital Affiliations And Coordinated Specialty Care

When choosing a primary care provider, it’s reasonable to ask: “If I ever need hospital care or a specialist, can my PCP coordinate that smoothly?”

Many physicians at Catalyst Physician Group’s Plano‑area clinics hold admitting or consulting privileges at major hospitals, and several practice inside or alongside large medical campuses:

•   Hospital affiliations for family physicians – Many Catalyst Physician Group family physicians hold admitting privileges at North Texas hospitals. Ask the clinic to confirm the affiliations for your specific physician.
•   Pediatric hospital connections – Texas Health’s directory lists Kishore Gadikota, MD (Catalyst Physician Group Pediatrics – Frisco) as having hospital affiliation with Texas Health Plano, supporting coordinated inpatient and outpatient pediatric care when needed.

If you’ve searched for “book a Plano primary care appointment with a provider who has hospital affiliations” or “Plano primary care doctors with experience in preventive cardiology,” looking at both the Catalyst Physician Group provider bios and external hospital directories can give you added confidence about continuity of care across settings.

How Catalyst Physician Group’s Plano Credentials Map To Common Search Goals

Here’s how some of the most common “near me” searches line up with real options in the Catalyst Physician Group network:

•   “Find Plano primary care providers with internal medicine credentials.”

Look for Douglas Fullington, MD, a board‑certified internal medicine physician at Catalyst Physician Group – Independence in Plano. His training is ideal for adults with multiple or complex conditions.

•   “Book an appointment with a Plano primary care physician who is a DO.”

Examples include Zachary Castle, MD at Catalyst Physician Group – West Plano and Diana Roy, MD at Catalyst Physician Group – Independence, both family medicine physicians trained in osteopathic medicine.

•   “Primary care in Plano accepting new patients with certified nurse practitioners.”

Catalyst Physician Group – West Plano and Catalyst Physician Group – Independence both feature board‑certified family nurse practitioners (e.g., Amy Hicks, NP; Sandra Portales, NP; Rebekah Ellis, NP; Kristin Kim, NP) who work closely with physician colleagues.

•   “Find a Plano primary care provider with pediatric experience and board certification.”

Catalyst Physician Group Pediatrics – West Plano offers board‑certified pediatrician Malini Hebbur, MD, caring for infants, children, and adolescents.

•   “Find a Plano primary care provider with a background in sports medicine.”

While Bryan McGee, MD, a fellowship‑trained sports medicine physician, practices at Catalyst Physician Group – Richardson, Plano patients can easily access this expertise for sports injuries and performance concerns while still keeping their day‑to‑day primary care at West Plano or Independence.

•   “Plano primary care clinics with providers who are members of national family medicine organizations.”

Provider bios such as Michael Maxwell, MD’s note involvement in national and state family medicine organizations, and the American Academy of Family Physicians (AAFP) represents more than 128,000 family physicians nationwide to promote high standards of care.

Because appointment availability changes day by day, the most reliable way to book a same‑day or next‑day visit with a board‑certified Plano primary care clinician is to use the “Book Now” buttons on the Catalyst Physician Group – West Plano, Catalyst Physician Group Pediatrics – West Plano, or Catalyst Physician Group – Independence pages or to call the clinic directly to ask about openings.

Regardless of the date published, no content on this website should ever be used as a replacement for direct medical advice from your primary care provider or another qualified clinician.