Mario Ortega, MD
Mario R Ortega, MD is the founder and driving force behind our practice here at International Pediatrics. Dr. Ortega graduated from the University of San Carlos of Guatemala and completed his residency at Children’s National Medical Center in Washington, DC. He founded the practice in 1973. Under his guidance we have developed a practice that focuses on working with the parent and child to provide the best health possible. With over 50 years experience as a doctor he has guided us to administer compassionate, family-centered care for children of all ages and family backgrounds.
Dr. Ortega enjoys spending time with his family as well as cheering on the Guatemala National Football team, of which he was a proud member in his younger days!
Jose Mario Ortega, MD
Jose Mario Ortega, MD has been a pediatrician at International Pediatrics since 1999. Son of founder Mario Ortega, MD he graduated from Francisco Marroquin University in Guatemala and completed his residency at the Holtz Children’s Hospital at the University of Miami/Jackson Memorial Medical Center where he was Chief Resident.
Jose Mario Ortega, MD currently serves on the Medical Advisory Committee of one of the largest insurance companies in the area. He is also a Director of a local children’s soccer club. In his spare time he enjoys spending time with his family and attending Capitals and soccer games.
Fabiola Costello, FNP
Fabiola is originally from Peru. She has lived in the Washington metropolitan area for more than 10 years. Fabiola earned a bachelor’s degree in nursing from Georgetown University and a masters in family medicine at Marymount University. Fabiola enjoys speaking Spanish with her patients and their parents. She is very proud of her Spanish heritage. Having grown up in a Latin American country, Fabiola has a deep understanding of Hispanic culture and the specific needs of Hispanic patients.
Her clinical interests encompass all aspects of pediatric care from newborn to adolescence. Her particular interests include preventive medicine and adolescent mental health issues. In her free time, Fabiola enjoys spending time with her spouse and three young children. She also loves playing tennis and painting super heroes. Fabiola’s multicultural experience has increased her belief that to be the best health care provider you need to have strong medical knowledge while being a sensitive and compassionate person.
Juliana Garcia, MD
Dr. Juliana Garcia is a pediatrician originally from Colombia. After completing medical school, she moved to Texas, where she completed her pediatric residency.
She is passionate about providing compassionate, family-centered care and building meaningful, lasting relationships with the families she serves. Dr. Garcia especially enjoys working with diverse patient populations and caring for children as they grow through different stages of childhood.
One of the most rewarding aspects of being a pediatrician is watching her patients grow and being able to support them and their families along the way.
Outside of medicine, Dr. Garcia enjoys spending time with her family and her dog, going for walks, and exploring her creative side. She enjoys painting with acrylics and trying different artistic crafts.
Claudia Lares, MD
Dr. Claudia Lares is a board-certified Pediatric Emergency Medicine physician and Pediatric Primary Care physician who is passionate about providing compassionate, comprehensive care to children and their families in English and Spanish. She brings extensive experience in pediatric emergency care, primary care, medical education, research, and community service to her practice.
Dr. Lares earned her medical degree from the J. M. Vargas School of Medicine at the Central University of Venezuela. She completed her Pediatric Residency at Albert Einstein Medical Center in Philadelphia and went on to complete fellowship training in Pediatric Emergency Medicine at the University of Mississippi Medical Center.
Since January 2025, Dr. Lares has been providing pediatric primary care at International Pediatrics, P.A., where she enjoys building lasting relationships with children and their families and caring for patients throughout their childhood. She also continues to serve as an Attending Physician in Pediatric Emergency Medicine at Johns Hopkins Suburban Hospital in Bethesda, Maryland.
Her clinical interests include pediatric emergency care, asthma, diabetic ketoacidosis, toxicology, pediatric trauma, and procedural sedation. She has contributed to numerous research studies and peer-reviewed publications and has presented her work at national and regional medical conferences.
Dr. Lares has always been committed to serving children and families, including her early work providing medical care and health education to underserved communities in Venezuela. She believes in partnering with parents to promote healthy development, prevent illness, and provide thoughtful, evidence-based care for every child.
Sandra Miller FNP-BC
Sandra hails from Mexico, but her upbringing was that of an Army brat. She spent her formative years overseas before enrolling at Northeastern University in Boston to pursue a Bachelor’s in Biology, which she completed in 1999. In 2015, she obtained a Master’s in Family Nurse Practitioner from Marymount University in Arlington, VA. Her experience spans the treatment of patients of all ages, including infants, children, adults, and GYN patients. Sandra prides herself on advocating for her patients and communicating effectively with them. She enjoys spending quality moments with her husband and three children in her free time, indulging in culinary pursuits, delving into literature, and basking in the great outdoors.
Natalia Orduz, MD
Dr. Natalia Orduz was born in Bogotá, Colombia, and moved to the United States at the age of 18. She earned her Bachelor’s degree in Biological Sciences from the University of Maryland, College Park, before obtaining her Doctor of Medicine degree from New York Medical College. She completed her pediatric residency training at Penn State Milton S. Hershey Medical Center.
Dr. Orduz joined International Pediatrics in 2022 with the goal of providing excellent, evidence-based medical care to children and families from diverse backgrounds. She is passionate about building meaningful relationships with her patients and their families and ensuring that every child receives compassionate, high-quality care.
As a native Spanish speaker and someone who has experienced the challenges of navigating healthcare across cultures, Dr. Orduz has a deep understanding of the healthcare disparities affecting the Latinx community. She is honored to help bridge language and cultural gaps and make healthcare more accessible to all.
Outside of medicine, Dr. Orduz enjoys spending time with her spouse, child, and their dog, exploring the outdoors through kayaking and hiking, discovering new restaurants, and traveling the world. She is passionate about both music and soccer.
David Rodriguez, MD
Dr. David Rodriguez is a dedicated pediatrician who joined International Pediatrics in 2024, driven by a deep commitment to supporting families from diverse backgrounds and Latino communities.
Recognizing a critical need in pediatric health, Dr. Rodriguez founded the empowerment clinic designed to address pediatric obesity as a chronic condition. The high demand for the clinic reflects both the clinic’s overall success and Dr. Rodriguez’s expanding expertise in pediatric metabolic health.
Alongside comprehensive weight management, key clinical interests include adolescent care, asthma, and chronic cough.
Outside of medicine, Dr. Rodriguez treasures spending time with family, playing tennis, competing in triathlons, and mastering the art of authentic paella.
Natalia C. Rodriguez, FEP, CPNP-PC
Natalia is originally from Bogotá, Colombia, where she earned her medical degree from FUCS University. She is an experienced and dedicated healthcare professional with more than 10 years of experience caring for children across all stages of life.
Natalia later attended Florida International University (FIU), completing its program for internationally trained physicians before earning her Master of Science in Nursing with a focus on Pediatrics. During her time in Florida, she practiced and volunteered as a pediatric nurse practitioner in Broward and Palm Beach Counties, gaining valuable experience serving diverse pediatric populations.
Now, after years of living in Florida, she and her family moved to the DMV area. Natalia is passionate about caring for children, empowering families, and helping young patients achieve their health and wellness goals. She is committed to providing compassionate, evidence-based, and family-centered care.
Outside of her professional life, Natalia enjoys traveling, reading, and spending time outdoors with her family. She is fluent in Spanish and English and is proud to bring her multicultural background and extensive clinical experience to her practice.
Natalia is excited to be part of International Pediatrics and is honored to work alongside such a dedicated and exceptional team of healthcare professionals.
Madalynn Tenney, NP
Madalynn is a proud Laurel, MD native who has dedicated her career to caring for children and families. She earned her education at The Catholic University of America and holds dual certifications in both Primary Care and Acute Care Pediatrics. Madalynn has been a Nurse Practitioner for the past seven years, following eight years of experience as a registered nurse.
Madalynn has a particular love for the Latin community and for working with diverse families, always striving to ensure that every patient feels listened to, respected, and cared for. Known for her warm and kind bedside manner, she believes in taking the time to truly listen and make each patient and family feel heard.
She is dedicated to providing thoughtful, evidence-based care and staying current with best practices in pediatrics. Over the past 15 years, Madalynn has worked closely with the Latin community and has developed a love for the Spanish language and culture.
She continues to build her Spanish fluency every day, with the goal of helping families communicate in the language in which they feel most comfortable and ensuring they feel welcomed and understood.
Outside of work, Madalynn enjoys making music with her husband and family. She loves to sing and play the piano, spend time outdoors, and dig in the dirt—whether that means gardening or simply enjoying the beauty of the great outdoors.
Janice Vasquez, MSN, CRNP
Janice Vasquez is a Pediatric Nurse Practioner with over 10 years of experience in caring for children and families. She earned her undergraduate degree in Nursing from University of Texas – Arlington and her Master’s degree in Nursing from The Catholic University of America, where she completed both the Primary Care and Acute Care Pediatric Nurse Practitioner programs.
Her professional background includes working in pediatric emergency medicine and outpatient pediatric primary care, giving her a broad perspective on children’s health across all stages of development.
She is passionate about understanding the health disparities within the Hispanic community and making sure every family feels heard, supported, and comfortable in their child’s care. Fluent in Spanish, she loves connecting with families in their preferred language and building relationships that make a difference.
Outside of the office, she’s a proud mom of three, a full-time dance mom and a dog mom to three very spoiled pups! When she’s not at work, you’ll probably find her at a dance competition, making memories on the beach with her family, or loving her dogs.