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Sagi Jacob Cohen, MD, is a board-certified internal medicine physician providing personalized concierge healthcare at Calabasas Medicine Group in Calabasas, California. He specializes in adult outpatient and hospital medicine. 

Dr. Cohen completed his residency in internal medicine at UCSF Fresno, one of California's largest emergency rooms and intensive care units (ICU), acquiring experience in a diverse patient population and medical conditions. Additionally, he has hospitalist and ICU experience at Providence Cedars-Sinai Tarzana Medical Center in Los Angeles, California, where he continues to maintain his privileges. 

Dr. Cohen’s unique and warm approach to medicine goes above and beyond traditional medicine as his focus is on timely, compassionate, preventative care, and a patient centered approach. With a gentle bedside manner, Dr. Cohen and his team are dedicated to the health and well-being of each patient. He believes that patients deserve longer visits with minimal waiting time and expedited access to top specialists. Dr. Cohen limits the size of his practice to ensure patients receive the highest level of care with non-rushed visits and a comprehensive understanding of their health needs.  

Dr. Cohen offers management of acute and chronic conditions, in-office diagnostic testing, comprehensive physical exams, and personalized treatment plans utilizing the most innovative and advanced technologies. The Calabasas Medicine Group is a fully equipped practice with a variety of the latest diagnostic modalities and treatments for convenience and faster results.

Nathan Alyesh, MD, is a board-certified internal medicine physician at Calabasas Medicine Group in Calabasas, California. Dr. Alyesh is affiliated with and maintains privileges at Providence Cedar Sinai Tarzana Medical Center, Cedar Sinai Medical Center, as well as California Rehab Institute. 

In his concierge practice, Dr. Alyesh can schedule new patients with extended appointment visits to address all their health and wellness needs. He is a skilled physician who is kind, compassionate, and has excellent bedside manners. 

Dr. Alyesh strongly believes in shared decision-making between patient and doctor. He understands that no two patients are alike and devises a plan unique to that individual. He encourages patients to ask questions about their medical care to make each visit educational and enjoyable. 

Dr. Alyesh focuses on preventive medicine and offers the management of acute and chronic diseases, in-office diagnostic testing, comprehensive physical exams, and personal treatment plans utilizing the most innovative and advanced technologies. 

As a concierge medical physician, he limits the number of patients he works with to ensure each patient receives ample time for each visit and top-quality care. Dr. Alyesh looks forward to welcoming new patients to his Calabasas practice.

It's time to allow yourself to settle into a new paradigm of health. One without long office wait times or feeling rushed at appointments.

At Calabasas Medicine, Danny Rosen, MD - being Board Certified Internal Medicine, offers Personalized Concierge Medicine to make your experience as enjoyable, educational, and convenient as possible - with a level of personalized care above and beyond traditional medical practices. Dr. Rosen specializes in Adult Outpatient and Hospital Medicine, managing both common and complex illnesses of adolescents, young adults and the elderly. Dr. Rosen’s philosophy is to merge the best of “Old School Medicine” with modern technology. He takes on lighter patient loads to ensure you receive top-quality care, and even offers house calls for added convenience.

As your Concierge physician, he will be organizing your care, focusing on prevention and lifestyle treatments, as well as needed medications.

He offers acute and chronic disease management, diagnostic testing, comprehensive physical exams, and personalized treatments that get patients on the road to recovery quickly. He utilizes the most innovative, advanced technologies, recommending the least invasive options first. 

Ashkan Lashkari, MD, is a physician at Wellness Oncology and Hematology. Dr. Lashkari offers personalized oncology and hematology care to patients at the practice’s offices in West Hills and Tarzana, California.

Born and raised in Santa Monica, California, by parents who were both dedicated educators, Dr. Lashkari knew at a young age that he wanted a career that would allow him to help others. He stayed close to home for his education, earning bachelor’s degrees in art history and molecular biology from the University of California at Los Angeles, and then remained at UCLA to complete his Doctor of Medicine degree.

During medical school, Dr. Lashkari developed a keen interest in cancer care, inspired by the discoveries of new treatments and the possibility of helping people with challenging conditions.

After an internal medicine residency at UCLA, Dr. Lashkari completed a fellowship in hematology and medical oncology at the City of Hope Comprehensive Cancer Center in Duarte, California. He focused his time on learning how to design clinical trials and researching familial cancer syndromes. His vast experience allows him to provide high-quality, compassionate care to his patients.

Dr. Lashkari is certified by the American Board of Internal Medicine, the American Board of Medical Oncology, and the American Board of Hematology. Because of his ongoing dedication to knowing about the latest oncology treatments and advances, he retains active membership in the Medical Oncology Association of Southern California, the American Society of Hematology, and the American Society of Clinical Oncology. He is also an assistant clinical faculty member at Olive View–UCLA Medical Center in Sylmar, California.

Dr. Lashkari enjoying spending time with his wife and two daughters, traveling, running, visiting museums, playing tennis, and cooking. He speaks English and Farsi.

Christopher Ho, MD, is a physician at Wellness Oncology and Hematology. Dr. Ho treats cancer and hematology patients in West Hills and Tarzana, California, as part of the Wellness Oncology and Hematology medical team.

Dr. Ho was born and raised in Philadelphia. He earned his undergraduate degree from Johns Hopkins University in Baltimore, where he lettered in lacrosse, then returned to Philadelphia to earn his Doctor of Medicine from Temple University. While in medical school, he clerked at the Fox Chase Cancer Center in Philadelphia, an experience that ignited his interest in medical oncology research.

After a residency in internal medicine at the University of California, Davis, Dr. Ho received subspecialty training in medical oncology and hematology at the University of Southern California’s Keck School of Medicine in Los Angeles. He served as chief fellow of medical oncology.

Dr. Ho is certified by the American Board of Internal Medicine, the American Board of Medical Oncology, and the American Board of Hematology. To keep up with the latest advancements in his specialties, he retains active membership in the Medical Oncology Association of Southern California, the American Society of Hematology, and the American Society of Clinical Oncology.

Dr. Ho has dedicated himself to the belief that the health of every one of his patients depends on a comprehensive, personalized approach to care that includes a combination of the latest treatment techniques and the personal touch of a physician who truly cares.

Because of his wide range of interests, including music, nutrition, calisthenics, Philadelphia Eagles football, and gourmet food, Dr. Ho is able to connect easily with his patients and share insightful conversations. He is a devoted family man, spending as much time as possible with his wife and two young sons. He speaks English, Spanish, and Chinese.

Omid S. Shaye, MD, is an oncologist and hematologist at Wellness Oncology and Hematology. Dr. Shaye treats patients at the practice’s medical offices in West Hills and Tarzana, California.

Dr. Shaye is a native of the San Fernando Valley. He earned his undergraduate degree from the University of Southern California in Los Angeles, then remained at USC to complete his Doctor of Medicine.

During his residency and fellowship in hematology and oncology at the USC Norris Cancer Center, Dr. Shaye was chosen as chief fellow of medical oncology. He then established Wellness Oncology and Hematology in order to share the newest, most cutting-edge therapeutic options with cancer and hematology patients in the San Fernando Valley.

Dr. Shaye sees his role as the “quarterback of a patient’s care,” offering individualized treatments that can include options like targeted therapies, clinical trials, immunotherapies, chemotherapy, radiation, and surgery. He spends time getting to know his patients and their families as he helps them along the road to wellness.

Dr. Shaye is certified by the American Board of Internal Medicine and the American Board of Medical Oncology. He is a member of the Medical Oncology Association of Southern California, the Community Oncology Alliance, and the American Society of Clinical Oncology. He speaks English, Spanish, and Farsi.

Omid S. Shaye, MD, is an oncologist and hematologist at Wellness Oncology and Hematology. Dr. Shaye treats patients at the practice’s medical offices in West Hills and Tarzana, California.

Dr. Shaye is a native of the San Fernando Valley. He earned his undergraduate degree from the University of Southern California in Los Angeles, then remained at USC to complete his Doctor of Medicine.

During his residency and fellowship in hematology and oncology at the USC Norris Cancer Center, Dr. Shaye was chosen as chief fellow of medical oncology. He then established Wellness Oncology and Hematology in order to share the newest, most cutting-edge therapeutic options with cancer and hematology patients in the San Fernando Valley.

Dr. Shaye sees his role as the “quarterback of a patient’s care,” offering individualized treatments that can include options like targeted therapies, clinical trials, immunotherapies, chemotherapy, radiation, and surgery. He spends time getting to know his patients and their families as he helps them along the road to wellness.

Dr. Shaye is certified by the American Board of Internal Medicine and the American Board of Medical Oncology. He is a member of the Medical Oncology Association of Southern California, the Community Oncology Alliance, and the American Society of Clinical Oncology. He speaks English, Spanish, and Farsi.

Ashkan Lashkari, MD, is a physician at Wellness Oncology and Hematology. Dr. Lashkari offers personalized oncology and hematology care to patients at the practice’s offices in West Hills and Tarzana, California.

Born and raised in Santa Monica, California, by parents who were both dedicated educators, Dr. Lashkari knew at a young age that he wanted a career that would allow him to help others. He stayed close to home for his education, earning bachelor’s degrees in art history and molecular biology from the University of California at Los Angeles, and then remained at UCLA to complete his Doctor of Medicine degree.

During medical school, Dr. Lashkari developed a keen interest in cancer care, inspired by the discoveries of new treatments and the possibility of helping people with challenging conditions.

After an internal medicine residency at UCLA, Dr. Lashkari completed a fellowship in hematology and medical oncology at the City of Hope Comprehensive Cancer Center in Duarte, California. He focused his time on learning how to design clinical trials and researching familial cancer syndromes. His vast experience allows him to provide high-quality, compassionate care to his patients.

Dr. Lashkari is certified by the American Board of Internal Medicine, the American Board of Medical Oncology, and the American Board of Hematology. Because of his ongoing dedication to knowing about the latest oncology treatments and advances, he retains active membership in the Medical Oncology Association of Southern California, the American Society of Hematology, and the American Society of Clinical Oncology. He is also an assistant clinical faculty member at Olive View–UCLA Medical Center in Sylmar, California.

Dr. Lashkari enjoying spending time with his wife and two daughters, traveling, running, visiting museums, playing tennis, and cooking. He speaks English and Farsi.

Christopher Ho, MD, is a physician at Wellness Oncology and Hematology. Dr. Ho treats cancer and hematology patients in West Hills and Tarzana, California, as part of the Wellness Oncology and Hematology medical team.

Dr. Ho was born and raised in Philadelphia. He earned his undergraduate degree from Johns Hopkins University in Baltimore, where he lettered in lacrosse, then returned to Philadelphia to earn his Doctor of Medicine from Temple University. While in medical school, he clerked at the Fox Chase Cancer Center in Philadelphia, an experience that ignited his interest in medical oncology research.

After a residency in internal medicine at the University of California, Davis, Dr. Ho received subspecialty training in medical oncology and hematology at the University of Southern California’s Keck School of Medicine in Los Angeles. He served as chief fellow of medical oncology.

Dr. Ho is certified by the American Board of Internal Medicine, the American Board of Medical Oncology, and the American Board of Hematology. To keep up with the latest advancements in his specialties, he retains active membership in the Medical Oncology Association of Southern California, the American Society of Hematology, and the American Society of Clinical Oncology.

Dr. Ho has dedicated himself to the belief that the health of every one of his patients depends on a comprehensive, personalized approach to care that includes a combination of the latest treatment techniques and the personal touch of a physician who truly cares.

Because of his wide range of interests, including music, nutrition, calisthenics, Philadelphia Eagles football, and gourmet food, Dr. Ho is able to connect easily with his patients and share insightful conversations. He is a devoted family man, spending as much time as possible with his wife and two young sons. He speaks English, Spanish, and Chinese.