Meet Our Providers

/Meet Our Providers
Meet Our Providers2018-05-04T10:15:08+00:00

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.

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.

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.

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.

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.


  • Deaconess Glover Memorial Hospital – Active Surgical
  • Steward Medical Group – Active Surgical


  • Foot and Ankle Surgery
  • Biomechanics and Custom Orthotics
  • Children’s Foot & Ankle
  • Diabetic Foot & Ankle Care
  • Wound Care Management


  • 1978 Doctor of Podiatric Medicine, Temple University College of Podiatric Medicine (formerly Pennsylvania College of Podiatric Medicine Philadelphia, PA)
  • 1974 B.A., Biology, St. Michael’s College, Winooski, VT


  • Bellwood General Hospital; Belflower, California – Foot and Ankle Surgery
  • Los Angeles County University of California General Hospital: Foot and Ankle Clinic; Los Angeles, California – Surgery, Neurology and Medicine
  • Woodruff Gables Hospital; Belflower, California – Foot and Ankle Surgery


  • 2012 – 2014 – Chairman of the Massachusetts Board of Registration in Podiatry
  • 2000 – 2008 – Chairman of the Massachusetts Board of Registration in Podiatry
  • 1997 – Present member of the Mass State Rotary Registration in Podiatry
  • 1995 – 1997 President, Mass. Podiatric Medical Society – Division Six
  • 1982 – 1984 Director of Residency Program – Mass Osteopathic Hospital and Medical Center; Podiatric Medicine and Surgery – two-year residency program in advanced foot and ankle surgery
  • 1979 – present Lecturer – Foot and Ankle Surgery


American Podiatric Medical Association, Massachusetts Podiatric Medical Association, Fellow, American College of Foot and Ankle Surgeons, American Academy of Podiatric Micro Surgery, American Academy of Podiatric Laser Surgery, American Association of Hospital Podiatrists


07-78 – 08-79 Selected by Podiatry School Physicians via a highly competitive process for the following residency position: Baja Crippled Children’s Project Mexico Clinic for Conservative and Surgical treatment of severe lower Extremity Deformities. Flying Physicians Program: Clinics in Mexico’s rural villages treating severe lower extremity problems conservatively and surgically one weekend a month.


  • 1993 – Present Member, Board of Directors, Norwood Rotary Club
  • 1992 – 1993 President, Norwood Rotary Club
  • 1988 – 1989 President, Norwood Rotary Club
  • 1987 – 1988 President-elect, Norwood Rotary Club

Dr. Jason Grennan is a Partner at Real Radiology and a US Board Certified Radiologist with over 12 years experience. Dr. Grennan earned his Undergraduate degree from The University of Nebraska at Lincoln and his medical degree from The University of Nebraska Medical Center. He finished his Residency in Radiology and Internal Medicine at The University of Nebraska Medical Center where he was named the Chief Resident in 2002. Dr. Grennan’s Fellowship was in Body Imaging at The University of Nebraska Medical Center.  Dr. Grennan is licensed to practice medicine in 40 States, and is a member of the Radiological Society of North America and the American College of Radiology. Dr. Grennan has worked in the past at the Omaha VA Medical Center and the University of Nebraska Medical Center.  Dr. Grennan has an extensive teleradiology experience gained working for NightHawk Radiology Services, now Virtual Radiology.  Dr. Grennan lives in Omaha, Nebraska with his wife and children, and enjoys Husker football, winter skiing and his family.

Dr. Mohammed F. Quraishi became a Partner of Real Radiology in August of 2015, with over 11 years of experience as a board certified Radiologist. Dr. Quraishi earned his Undergraduate degree from Trinity University, majoring in Biochemistry and Spanish. Dr. Quraishi earned his Medical Degree from the University of Texas Medical Branch at Galveston. He finished his Residency in Diagnostic Radiology at The University of Nebraska Medical Center in 2005 where he was named the Chief Resident in 2003. Dr. Quraishi’s fellowship in Vascular and Interventional Radiology was completed in 2006, also at The University of Nebraska Medical Center. Dr. Quraishi has extensive radiology experience – gained from being a leader in one of the largest private practice radiology groups in the US since graduation, as the Section Head for Interventional Radiology and for an internal pool of on-demand teleradiology readers. Dr. Quraishi is affiliated with the American Roentgen Ray Society, the American College of Radiology, the Radiological Society of North America, and the Society of Interventional Radiology.  Dr. Quraishi grew up in Clear Lake, Texas, graduating from Clear Lake High School. He lives in Kirkland, Washington with his wife and 2 boys.  He enjoys hiking, outdoor activities with his boys, and traveling.

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.

Internal Medicine Nurse Practitioner

Cefora Rubin has 18 years of experience in individual therapy, family therapy and many other modalities in which she can offer counseling. She is fluent in English, Spanish, Portuguese and Hebrew. Prime Medical Associates is a safe place supported by confidentiality, cultural sensitivity and a welcoming, non-judgmental environment. Within this practice she offers compassion, mindfulness and unconditional support. The physicians at Prime Medical Associates work together with her in addressing both mind and body in a holistic approach to achieving a healthy balance in all areas of your life.