Tahani Williams, MD
Family Physician
13108 Hunters Ridge Lane
Bowie, MD 20721
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177 providers
Availability last updated 06/05/2026
Tahani Williams, MD
Family Physician
13108 Hunters Ridge Lane
Bowie, MD 20721
Mercy Obamogie, MD
Family Physician
4903 Georgia Ave Nw
Washington, DC 20011
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.
Colleen Abell, CRNP
Nurse Practitioner
6502 Kenilworth Ave
Suite 100
Riverdale, MD 20737
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.
Xinna Yi, FNP
Nurse Practitioner
6502 Kenilworth Ave
Suite 100
Riverdale, MD 20737
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.
Abbi Lamparelli
Nurse Practitioner
6502 Kenilworth Ave
Suite 100
Riverdale, MD 20737
Carelife Style
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Dr. Fatima Aziz-Ashraf, MD
Internist
2826 Old Lee Hwy
Suite 250
Fairfax, VA 22031
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.
Elizabeth York, PA-C
Physician Assistant
2710 Prosperity Ave
Ste 200
Fairfax, VA 22031
Alexandra Minutillo, PA-C, is a physician assistant at Fairfax Colon & Rectal Surgery, PC. She earned her Bachelor of Arts in Chemistry with a minor in Creative Writing from Washington & Lee University and her Master of Physician Assistant Studies from Chatham University in Pittsburgh, Pennsylvania.
Alexandra began her career at Fairfax Colon & Rectal Surgery in September 2024, where she specializes in the diagnosis and treatment of hemorrhoids, pilonidal cysts, anal pain, abscesses, pruritus, and other colorectal conditions. She was drawn to colorectal surgery during her PA school training, where she developed a strong interest in both the clinical and procedural aspects of the field.
She values building trust with her patients and takes pride in guiding them through sensitive concerns with compassion and clarity. In her spare time, she enjoys exploring Washington, D.C., and spending time with her family and friends.
Alexandra Minutillo
Physician Assistant
2710 Prosperity Ave
Ste 200
Fairfax, VA 22031
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. Ndubuisi Okafor
Internist
7603 Georgia Ave NW
Suite 100
Washington, DC 20012
Ms. Shannon Martin, FNP-C
Family Physician
3169 Braverton Street
Suite 102
Edgewater, MD 21037
PRIMARY & ALTERNATIVE MEDICAL CENTER
Is Truly Patient Centered.
You are the reason we are here. Our goal is to help you feel better mentally, physically and spiritually. Our primary tools are listening to you sensitively, examining you carefully and then discussing with you thoroughly, our opinions and your options. We see health care as both a science and an art. There is rarely one right answer, and one size almost never fits all. When it comes to your health we will incorporate highly accurate diagnostic laboratories and advance imaging studies with our medical expertise. We will derive diagnoses and treat appropriately as well as make a referral to our affiliated specialist. We will be attentive to your specific needs, concerns and fears. We see you each as special individuals and not merely as people with high blood pressure, diabetes, depression, obesity or high cholesterol. We see ourselves as your primary care providers, health care advisers, educators, and teammates. Patients that take an active role in their health care generally do better.
Dr. Jean Welsh
Family Physician
12162 Tech Rd
Silver Spring, MD 20904