Gastroenterologists in Lancaster, CA

The brief descriptions below are designed to familiarize you with our staff's training, professional credentials and work experience.

Jatinder S. Pruthi, MD, FACG, CPI

Jatinder S. Pruthi, MD, a partner in High Desert Gastroenterology, currently is an attending staff gastroenterologist at Antelope Valley Hospital, and Palmdale Regional Medical Center and also was chairman of the department of medicine at Lancaster Community Hospital, and serves on various hospital committees.

Dr. Pruthi earned an undergraduate degree in biology from D A V College in Jalandhar, India and his bachelor of medicine and bachelor of surgery (MBBS) degree as well as his internship at the Government Medical College located in Patiala, India.

In the United States, Dr. Pruthi completed his residency in internal medicine at New York Methodist Hospital, an affiliate of New York Hospital-Cornell University Medical Center in Brooklyn, N.Y. He served his fellowship in gastroenterology at Kaiser Permanente Medical Center, through the University of California in Los Angeles. He is a diplomate of the American Board of Internal Medicine for gastroenterology.

Dr. Pruthi is a member of the American College of Physicians, the American Gastroenterology Association, the American Society of Gastrointestinal Endoscopy and the American College of Gastroenterology.

As an author or co-author, his work has been published in peer-reviewed medical journals. He has been involved in and completed multiple Clinical Research projects over the last 10 years during practice.

Dr. Pruthi frequently gives community education and medical education lectures. He handles a wide spectrum of Gastrointestinal diseases with a special interest in Liver disease, Pancreatic and Gall Bladder disease. Dr. Pruthi is trained to perform all advanced endoscopic procedures including ERCP, Endoscopic stenting, Endoscopic Ultrasound (EUS) and Liver Biopsies.

He likes Reading, Meditation, Light Music and Chess.


Canagaratnam Pathmarajah, MD

Dr. Pathmarajah is a fellow of the American College of Physicians, member of the American Society of Gastrointestinal Endoscopy, and member of American College of Gastroenterology. He is also Board Certified in Pathology, both clinical and laboratory pathology.

Dr. Pathmarajah has been in private practice for more than 30 years in the Antelope Valley area caring for the patients in the specialty of Internal Medicine and Gastroenterology. He has dedicated much of his time in the care of elderly patients and has gained enormous experience in the routine diagnostic and therapeutic endoscopic procedures through these years.

Dr. Pathmarajah has encountered large number of young as well as elderly patients with anorectal disorders and rectal hemorrhage mainly from hemorrhoids. He has, therefore, taken special interest in caring for these patients. His intention is to provide effective and painless cure for these patients who suffer from chronic discomfort. High Desert Gastroenterology, Inc. is now well equipped with state-of-the-art instruments that are utilized for effective cure of the patients who com with such complaints.


Vivaik Tyagi, MD

Dr. Vivaik Tyagi, was trained in Internal Medicine in the US at University of New York, Brooklyn, N.Y. He concluded his final year of Internal Medicine as chief resident at Brooklyn VA Hospital, New York. After completion of the GI fellowship program at SUNY Downstate New York, he proceeded to the fourth year of advanced fellowship training at Milwaukee, Wisconsin where he refined his skills in endoscopic ultrasound and complex pancreaticobiliary cannulations.

Dr. Tyagi has special interest in the endoscopic treatment of benign and malignant tumors of the gastrointestinal tract. He has utilized his luminal stenting skills on difficult obstructive malignancies of the intestine and given patients considerable relief and prevented their transfer to tertiary centers. Dr. Tyagi's artful application of endoscopic ultrasound and sophistication in pancreaticobiliary cannulation has indeed raised the standard of the local hospitals in Antelope Valley to be in par with the tertiary centers in Los Angeles.

Dr. Tyagi has a knack for developing a close rapport with his patients. He devotes whatever time it takes to educate his patients for them to comprehend fully their medical problems. Dr. Tyagi is convinced that patient understanding and willing participation in the treatment strategy greatly enhances the healing process. He carries the distinction of having performed successfully the first endoscopic ultrasound assisted cannulation of the common bile duct that was not amenable to the conventionally applied techniques.

Dr. Tyagi vigorously participates in the activities of hospital governance and currently is an active member of the executive committee at Antelope Valley Hospital Medical Center.


Prithviraj Dharmaraja, MD

Dr. Prithviraj Dharmaraja graduated from the University of Sri Lanka-Colombo in 1980. He completed his internship and residency in Internal Medicine in 1987 at Our Lady of Mercy Medical Center.

In 1987, he completed his fellowship in Gastroenterology at Venderbilt University in Nahsville, Tennessee.

He has been in practice as a part of High Desert Gastroenterology since 1987. He has an office in Lancaster and also in Ridgecrest where he has been seeing patients for almost 25 years.

Dr. Dharmaraja is Board Certified in Internal Medicine and Gastroenterology and is an active member of the American Society of Gastrointestinal Endoscopy and specially interested in GERD, colon polyps, and the prevention of colon cancer.

He has hospital privileges at  Antelope Valley Hospital, Palmdale Regional Medical Center, and Ridgecrest Regional Hospital.

He is the chief of Gastroenterology at Antelope Valley Hospital.

He is an avid single digit golfer who enjoys traveling and playing golf worldwide. 


Raman M. Patel, M.D., MRCP, FACP, FACG, CPI

Dr. Raman M. Patel has been practicing Gastroenterology in Antelope Valley for the last 30 years. He started with solo practice and merged with Dr. Pathmarajah in four months to form High Desert Gastroenterology. He was instrumental in expanding and enhancing gastroenterology practice in Antelope Valley, from primary diagnostic endoscopic procedures in office to highly complex therapeutic procedures in hospital setting. Thereby facilitating comprehensive gastroenterology care to the residents of Antelope Valley.

High Desert Gastroenterology is now composed of well accomplished and skillfully trained young gastroenterologist, who provides efficient gastroenterology subspecially care. Dr. Patel also engineered, well-equipped, state-of-the-art outpatient endoscopy center as well as gastroenterology/histopathology lab in the office.

Dr. Patel graduated with MBBS from B.J. Medical College, in Ahmedabad, India. He completed his three years of Residency in Internal Medicine in three different countries, earning MD from Gujarat University, Ahmedabad, India; MRCP from Royal College of Physicians in Edinburgh, Scotland; Internal Medicine Board Certification from New York, USA. Dr. Patel performed his fellowship in Gastroenterology and Hepatology at Brooklyn Veterans Administration Medical Center in Brooklyn, New York.

Dr. Patel is Board Certified in Internal Medicine and Gastroenterology and Fellow of American College of Physicians and American College of Gastroenterology. He is a member of Royal College of Physicians  of United Kingdom. He is an active member of American Society of Gastrointestinal Endoscopy since 1980. He is a certified physician investigator.

Dr. Patel has served on many committees including executive at both local hospitals and has done clinical research for 10 years for High Desert Gastroenterology. Dr. Patel has published many articles and continued to be active in practice in all aspects of Gastroenterology and Hepatology.


Kumaravel Perumalsamy, MD

Dr. Perumalsamy graduated from Thanjavur Medical College, India. He completed his Internal Medicine residency from Coney Island Hospital, Brooklyn, New York. He completed his Gastroenterology fellowship from Maimonides Medical Center, Brooklyn, New York and Hepatology from Mount Sinai Medical Center, New York.

Dr. Perumalsamy is board certified in Internal Medicine and in Gastroenterology. He is an active member of different societies including the American College of Gastroenterology, American Gastroenterology Association, and American Society of Gastrointestinal Endoscopy.

Dr. Perumalsamy currently serves on the quality improvement committee of Antelope Valley Hospital. He is a member of the peer-review committee of the American College of Gastroenterology. He has numerous publications and has co-authored in textbooks. He is interested in teaching and has given numerous lectures to the community and fellow physicians.

Dr. Perumalsamy has interest in all aspects of Gastroenterology and Hepatology and is specializing in Advanced Endoscopic procedures including Luminal stenting, ERCP, and Endoscopic Ultrasound.