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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.

David Schoenfish is a physician assistant Board Certified by the National Commission of Certification of Physician Assistants (NCCPA). David is a member of the American Academy of Physician Assistants, and he is currently licensed to practice by the Virginia Board ofMedicine and the Maryland Board of Physicians.

David graduated summa cum laude with a Bachelor of Science in Exercise Science from the University of Sioux Falls in Sioux Falls, SD, during which he was also a member of the USF men’s cross country and track and field teams. He then received his Master of Physician Assistant Studies degree from the University of Nebraska Medical Center (UNMC) in Omaha, NE. During his physician assistant education, David gained experience in assessing and treating various neurologic conditions including traumatic brain injuries, stroke, polytrauma, Parkinson’s disease, Alzheimer’s disease and other forms of dementia, migraine, and multiple sclerosis in inpatient and outpatient settings while rotating with the UNMC Neurological Sciences department and at Madonna Rehabilitation Hospital in Omaha, NE. He has previous clinical experience working as a patient care technician in the neurology unit at Avera McKennan Hospital and University Health Center in Sioux Falls, SD.

Outside of practicing medicine, David enjoys running, cycling, music, following the Minnesota Twins, and spending time with friends and family.

Board Certified in Integrative & Holistic Medicine as well as Family Medicine, Certified Functional Medicine physician Dr. Calihan brings decades of experience to her work with patients, whom she helps achieve optimal health and wellness through a variety of techniques.

Dr. Calihan has spent many years studying and obtaining credentials in holistic, functional, and integrative medicine. Her practice has been awarded the Best of Loudoun prize for alternative medicine each year since 2007.

Dr. Calihan graduated from Smith College in Northampton, Massachusetts, before obtaining her medical degree from Georgetown University Medical School in Georgetown, Washington, DC.

Dr. Calihan trained and precepted at the Center for Mind-Body Medicine in Washington, DC, and she also trained in acupuncture with Dr. Joseph Helms at UCLA.

In 2000, Dr. Calihan earned her board-certification in Holistic Medicine, and in 2014 became a member of the first class of Certified Functional Medicine Physicians through the Institute of Functional Medicine.

Dr. Calihan was a founding owner and former medical director at Loudoun Medical Group, one of the largest multi-specialty physician practices in the mid-Atlantic region. She was also their Board Chair from 2000 to 2005.

Dr. Calihan specializes in the treatment of chronic, complex conditions, including autoimmune disease, thyroid and hormonal imbalances, biotoxin illness, chronic fatigue, and fibromyalgia. Using the Functional medicine approach, she searches for the cause of a condition and then works to help rebalance the system.

Visit Dr. Calihan for compassionate, comprehensive health care with a personal touch. She’s currently welcoming new patients.

John Watts Haresch, MD is a family medicine physician who joined the practice in 2024. He currently focuses on the care of older adults. He previously served as a Regional Medical Officer with the U.S. Department of State, operated a full-spectrum private practice, and has been medical director of organizations meeting the needs of underserved communities. He completed medical school and family medicine residency in the University of North Carolina system.

Melissa Falkowski attended Mount Saint Mary College where she graduated Summa Cum Laude with her Bachelor of Science in Nursing Degree. Melissa has over 15 years of experience in the healthcare field, including Oncology, Preoperative and Postoperative care, and Operating Room experience. After working for 2 years in the Operating Room with Dr. Desai, Melissa joined the team at International Spine, Pain & Performance Center in 2017. As Chief Operating Officer, Melissa is focused on ensuring all clinical standards are met to guarantee that our patients receive optimal and cutting edge care. Melissa partners with the clinicians at ISPPC to execute our mission statement of being leaders in clinical excellence. In her spare time, Melissa enjoys traveling the world with her husband and daughters, and spending time with their family and friends.

Capital City Primary and Immediate Care’s approach to family medicine gives you the flexibility to focus on your health when it works for you. Fernando Porter, MD, and the attentive care team partner with you to support your day-to-day health and self-care routines, at the office location in Silver Spring, Maryland. When you’re sick and need care, the team is standing by around the clock. They will be available to you 24/7 virtually or in-person during routine office hours with providers that can help get you on track. They’ll take the hassle and guesswork out of feeling better.

When you need to manage urgent, preventive, or chronic health conditions, we try our very best to make it easy and are there for you at the touch of a button. From healthy eating to vaccinations and preventive physical exams, we provide trusted health care solutions that are driven by compassion, integration of technology, and use of the most up-to-date, evidence-based information.

Capital City Primary and Immediate Care is a proud member of Privia Medical Group - a physician-led, multi-specialty, national medical group.

To make an appointment, call Capital City Primary and Immediate Care or book an appointment online today.

Akukeng W. Mba, MSN, FNP, CFCS, is an experienced family nurse practitioner with 15 years of experience, including almost five experience as a foot care specialist. She’s highly skilled in exceeding the general and podiatry needs of patients aged 12 and older.

Akukeng received her bachelor’s and master’s degrees in nursing and family nurse practitioner credentials from Coppin State University in Baltimore, Maryland. She is a registered nurse and family nurse practitioner (FNP) who maintains her advanced medical credentials with continuing education.

Akukeng has worked in hospital and clinic settings. She has expertise in medication administration, nursing education, critical care medicine, healthcare management, advanced cardiac life support, and foot care. Akukeng specializes in routine foot assessments, diabetic foot exams, callus debridement, and managing conditions that affect the toenails.

Akukeng loves spending time with her friends and family when she’s not caring for patients. She welcomes new and existing patients to Diversity Health Clinic LLC and looks forward to improving their health and quality of life. 

Abraham Mbangowah, MSN, FNP, is a compassionate family nurse practitioner with nearly 15 years of experience working with patients of all ages. He’s highly skilled in all areas of primary, urgent, and preventive care.

Abraham earned his associate's degree in general studies at Prince George’s Community College in Largo, Maryland. He received his bachelor’s degree in nursing at Coppin State University in Baltimore, Maryland, where he graduated cum laude and was a member of the Mary Mahoney Honors Society. Abraham received his master’s degree and family nurse practitioner training at Chamberlain University in Irving, Texas. 

He’s a certified family nurse practitioner (FNP). Abraham specializes in general medicine and all areas of primary care, including the treatment of illnesses, diseases, and mental health conditions. He completes continuing education to provide the latest advances in medical care.

Abraham speaks English, French, and Creole. When he’s not working, he enjoys spending time with family and friends.

Abraham is passionate about caring for his patients and warmly welcomes them to Diversity Health Clinic LLC.  

Dr. Chantal D. Lewis is a board-certified family medicine physician with over ten years of experience in providing care for the elderly, young adults and children. She was one of the proud recipients of the Northern Virginia Top Doctors award in 2015 and 2016. Naturally enthusiastic, driven, and passionate about learning, she brings a comprehensive approach to medical care by helping patients optimize their mental, spiritual, and physical health. Over the years, Dr. Lewis has recognized the need for providing care for the elderly, disabled and home bound at their place of residence and has spent the latter part of her career providing in home physician services to patients in Northern Virginia. Treating every patient as if they were family, she provides a listening ear, a warm heart, and a patient centered medical home for those in need.

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.

Capital City Primary and Immediate Care’s approach to family medicine gives you the flexibility to focus on your health when it works for you. Fernando Porter, MD, and the attentive care team partner with you to support your day-to-day health and self-care routines, at the office location in Silver Spring, Maryland. When you’re sick and need care, the team is standing by around the clock. They will be available to you 24/7 virtually or in-person during routine office hours with providers that can help get you on track. They’ll take the hassle and guesswork out of feeling better.

When you need to manage urgent, preventive, or chronic health conditions, we try our very best to make it easy and are there for you at the touch of a button. From healthy eating to vaccinations and preventive physical exams, we provide trusted health care solutions that are driven by compassion, integration of technology, and use of the most up-to-date, evidence-based information.

Capital City Primary and Immediate Care is a proud member of Privia Medical Group - a physician-led, multi-specialty, national medical group.

To make an appointment, call Capital City Primary and Immediate Care or book an appointment online today.

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.