Call Today

Internal Medicine: (508) 979-1100
Neurology: (508) 993-9760
Sleep Lab: (508) 993-9781

Meet Our Providers

At Prime Medical Associates, our highly qualified doctors, nurse practitioners, and professional support staff provide exceptional care for you and your family. Out multispecialty practice in Dartmouth, Massachusetts includes board-certified and fellowship-trained internists, infectious disease specialists, and neurologists with subspecialties in sleep medicine and epilepsy.

Our goal is to provide you with attentive service and individualized care at every visit. To schedule an appointment, call our office or request an appointment online.

Pedro Falla, MD

Pedro Falla, MD

Board Certified in Internal Medicine

Dr. Pedro Falla earned his medical degree from the Universidad Peruana Cayetano Heredia in Lima, Peru in 1994. The following year he came to the United States to pursue his residency in internal medicine at William Beaumont Hospital in Royal Oak, Michigan. He also completed a fellowship in geriatrics at William Beaumont in 1999.

After his fellowship training, Dr. Falla practiced internal medicine at MetroMedic in New Bedford, Massachusetts until 2004 when he established his own private practice, Falla Medical Clinic. In mid-2010, he and Dr. Rajan combined their practices to form Prime Medical Associates.

In addition to being board certified by the American Board of Internal Medicine, Dr. Falla is a COLA-accredited lab director and certified by the American College of Cardiology to interpret electrocardiograms (ECGs). He is an active member at St. Luke’s Hospital in New Bedford, Massachusetts.

Mariel Del Rio, MD

Mariel Del Rio, MD

Board Certified in Internal Medicine & Infectious Disease

Dr. Mariel Del Rio earned her medical degree from the Universidad Peruana Cayetano Heredia in Lima, Peru in 1997. During the summer of 1997, she studied internal medicine and hematology at the University of Miami School of Medicine/Jackson Memorial Hospital. Dr. Del Rio then completed her internal medicine residency and fellowship in infectious disease at Henry Ford Health System in Detroit, Michigan in 2003.

Dr. Del Rio is board certified by the American Board of Internal Medicine with a subspecialty certification in infectious disease. She joined Prime Medical Associates in 2017. Dr. Del Rio is on staff at St. Luke’s Hospital in New Bedford and a member of the Peruvian Medical Association and Infectious Diseases Society of America.

Arun Rajan, MD

Arun Rajan, MD

Board Certified in Neurology & Sleep Medicine

Dr. Arun Rajan has been practicing neurology since 1998. He earned his medical degree at the University of Madras Coimbatore Medical College in India in 1983. After an internship there, he came to the United States in 1986 as a visiting associate and post-doctoral fellow of the National Institutes of Health Section of Neurochemistry in Bethesda, Maryland until 1990.

In 1997, Dr. Rajan completed his neurology residency at New York University Medical Center in New York, NY followed by a fellowship in neurophysiology, epilepsy, and sleep medicine at the University of Texas Southwestern Medical Center in Dallas in 1998.

After his fellowship, Dr. Rajan joined a private practice in New Bedford, Massachusetts until forming his own practice, Neurology Associates, in 2001. He and Dr. Falla combined practices in 2010 to establish Prime Medical Associates.

Dr. Rajan is a diplomate of the American Board of Psychiatry and Neurology and the American Board of Sleep Medicine. He has previously served as the chief of neurology at both St. Anne’s Hospital in Fall River and St. Luke’s Hospital in New Bedford. Dr. Rajan also served as the medical director of Southcoast Hospitals Group Sleep Laboratories in Wareham and New Bedford, as well as Sleep Health Centers in North Dartmouth.

As a specialist in epilepsy, Dr. Rajan was the director of an epilepsy monitoring unit for over 9 years. Along with neurosurgeons, interventional radiologists, neuro-psychologists, and trained cortical EEG monitoring technicians, he successfully performed epilepsy surgeries including focal resection, sub-pial transections, and VNS implant.

Dr. Rajan is a member of the American Academy of Neurology, American Academy of Sleep Medicine, and American Epilepsy Society.

Hector Oshiro, MD

Board Certified in Internal Medicine & Infectious Disease

Dr. Hector Oshiro graduated from medical school at the Universidad Peruana Cayetano Heredia in Lima, Peru in 1995. He completed his internship at the Greater Baltimore Medical Center in 1998, followed by his internal medicine residency at the University of Louisville in 2000. Dr. Oshiro pursued fellowship training in infectious disease, also at the University of Louisville Hospital, which he completed in 2002.

Prior to joining Prime Medical Associates in 2017, Dr. Oshiro practiced in Pawtucket, Rhode Island. He is board certified by the American Board of Internal Medicine with a subspecialty certification in infectious disease.

Jessica Agaran, NP

Rachel Clay, NP

Internal Medicine Nurse Practitioner

Jessica Agaran earned her Master of Science in nursing from Sacred Heart University in January 2012. Jessica is a Board Certified Family Nurse Practitioner and a Registered Nurse in the state of Massachusetts and Connecticut. She is also CPR certified. Her philosophy of care is to treat each and every person with compassion and dignity, with affordable and efficient care.

Rachel Clay, NP

Rachel Clay, NP

Internal Medicine Nurse Practitioner

Prime Medical Associates