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Elizabeth York, PA-C, is an experienced physician assistant at Fairfax Colon & Rectal Surgery, PC.

Growing up as a high school science teacher’s daughter, Elizabeth always gravitated toward studying medicine. She received her bachelor’s in science from Boston College in Boston, Massachusetts, before beginning her career managing clinical research trials.

After spending several years in the research sector, Elizabeth realized she wanted to work directly with patients. She earned her physician assistant degree from George Washington University in Washington, D.C. Elizabeth’s interest in colorectal surgery grew during her general surgery training, and she ultimately completed formal training.

Elizabeth is proud to serve patients struggling with anal pain, hemorrhoids, colon cancer, and other colorectal ailments at Fairfax Colon & Rectal Surgery, PC. She truly enjoys taking an active role in her patients’ health care management and well-being.

In her spare time, Elizabeth loves spending time with her husband, Chris, and their daughter. The family especially enjoys exploring the culture and diversity Washington, D.C., has to offer.

• PA, The George Washington University, 2010
• B.S. Biology, Boston College, 2002

Carelife Style

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Ndubuisi Okafor, MD, is a board-certified internal medicine physician with over 20 years of experience. At his practice, Okafor Medical Associates, located in Washington, DC, Dr. Okafor offers patients compassionate care for a variety of conditions including chronic disease management, ADHD, and internal medicine concerns as a leading primary care physician.

Dr. Okafor obtained his medical degree from the Howard University Hospital and is board-certified by the American Board of Internal Medicine. He is also specially trained in Advanced Trauma Life Support and Advanced Cardiovascular Life Support.

Dr. Okafor is a registered Civil Surgeon with the United States Center for Immigration Services, so he can provide Immigration Medical examinations with all the required tests in the facility. In addition, is a Registered Certified Medical Examiner with the Federal Motor Carrier Safety Administration, so he can provide medical examination and certification for commercial motor vehicle drivers.

When he is not treating his patients, Dr. Okafor enjoys spending time with his family and pursuing his hobbies which include football, soccer, and running. Dr. Okafor also speaks English, Ibo, Yoruba, and Hausa.

He looks forward to meeting new patients and giving them the best care possible.

Dr. Dan Bishwakarma is a board-certified family physician at Prime Medical Care, LLC, serving residents living in the Alexandria, Virginia area. He earned his M. B., B. S. (Bachelor in Medicine and Bachelor in Surgery) degree from Tribhuvan University, Nepal. He completed his residency in Family Medicine at the Wyckoff Heights Medical Center, New York, affiliated with Cornell University, in June 2008. He served as a chief resident in the last year of his residency. His residency training in the metropolitan environment of New York City and work experience soon after have given him the knowledge and skillset required to manage a wide variety of illnesses in a diverse patient population. He is currently practicing in Alexandria, VA providing primary and immediate care to the surrounding D.C. Metro areas.

At Prime Medical Care LLC, Dr. Bishwakarma places a strong emphasis on disease prevention and health promotion. To prevent illness, he encourages his patients to participate in annual comprehensive physical exams and periodic health checkups. He promotes health screening based on each patient’s individual personal history, family history, and risk factors. To promote health, he provides education on healthy habits such as exercise, good nutrition, smoking cessation and stress management. He treats a variety of chronic medical conditions including but not limited to:

• Diabetes
• High blood pressure
• High cholesterol
• Thyroid disease
• Asthma
• Chronic bronchitis
• Acid reflux
• Depression/anxiety
• Arthritis

In addition, he also treats patients who need immediate care like:

• Allergies
• Flu
• Acute sinusitis
• Strep throat
• Ear infections
• Acute bronchitis
• Pneumonia
• UTIs & STIs

He’s very experienced as to when to refer patients to emergency care facilities and/or specialists where they can receive the level of care they need. Through social media, his patients say Dr. Bishwakarma is a very efficient and knowledgeable doctor with excellent bedside manner.

Personally, Dr. Bishwakarma is a family oriented person. He has been married for nearly 25 years.  He has a very supportive wife and three wonderful children: two sons and one daughter. He loves to listen to music, read and spend time with his family when he is not working. He strongly believes that good family support is essential to cope with illnesses and to be healthy.

Xinna Yi is a board-certified Family Nurse Practitioner with a Master of Science in Nursing from Wilkes University, which she completed in 2023. She brings a wealth of experience from her work in a family medical clinic and her previous role as a Registered Nurse specializing in cardiology medicine. Before transitioning to nursing, she graduated from medical school in China and gained one and a half years of experience as a gastrointestinal physician at an academic hospital in China.

 Xinna is committed to patient-centered care, employing a collaborative, team-based approach to healthcare. She has a passion for continuous learning and teaching. In her personal life, she enjoys spending time with her family, reading, watching movies, and traveling.

Colleen Abell is a board-certified Family Nurse Practitioner. She graduated with a Master of Science in Nursing from Georgetown University in 2006. She has practiced as a nurse practitioner for the past sixteen years. Ms. Abell's experience includes working in a family medical clinic, but she spent most of her career providing care for patients recovering from Bariatric and GI surgical/oncology procedures. Prior to becoming a nurse practitioner, Ms. Abell worked as a Registered Nurse in cardiology and emergency medicine.

Colleen joined the Gastro Center of Maryland in 2021 after relocating from the NY/NJ area. She is dedicated to being a great provider and advocate for her patients. Outside of work, Ms. Abell enjoys spending time with her husband and three boys.

Abbi Lamparelli is a Nurse Practitioner with Gastro Centers of Maryland, bringing over a decade of hands-on clinical experience to her role. She began her career in medical-surgical and emergency medicine and transitioned into advanced practice nursing in 2023 after completing her training at Drexel University. She further advanced her education by earning a Doctor of Nursing Practice from Aspen University.

Abbi’s approach to patient care is deeply rooted in compassion and respect. She emphasizes a patient-centered, holistic, and evidence-based philosophy—ensuring that each individual receives personalized care tailored to their unique health journey. She remains committed to empowering patients with clear communication, shared decision-making, and attentive follow-up.

Beyond her clinical work, Abbi has a strong interest in healthcare research and ongoing professional development. Outside of work, Abbi enjoys reading, birdwatching, and trying new restaurants—interests that highlight her curiosity and appreciation for both quiet moments and fun new experiences.