Meet the Physicians

Joseph Habis, MD

Specialty: Internal Medicine, Travel Medicine

Dr. Joseph Habis, the Medical Director of Prima Medical Group, is a medical physician specializing in internal medicine and travel medicine in Marin County. He currently practices in Terra Linda, California. He was born in Ecuador and immigrated with his family to San Francisco at the age of four. He pursued his interest in medicine and graduated from U.C. Davis in 1990. While a medical student, Dr. Habis organized several health programs for health-practitioner students and residents in Ecuador and was a founding board member of the organization Child Family Health International in 1992. His awards include both the “Golden Cup” (awarded by his medical school faculty and peers) and “Ciba-Geigy” for outstanding community health leadership. His publications include topics related to cross-cultural medicine and travel and international health. Dr. Habis has shared his expertise in travel medicine as a guest on many television and radio shows. He has traveled extensively throughout the globe and enjoys swimming, photography, and playing music.


Lori Katnik, NP

Specialty: Family Medicine

Lori Katnik is a board certified Family Nurse Practitioner who received her Master’s in Nursing from Sonoma State University. She brings with her a diversity of experience from her previous work as a dental hygienist, dental hygiene educator, and as a nurse practitioner in pediatrics, asthma/allergy and family care.

At Prima, Lori provides primary care to both adults and children, with a focus on prevention and working with patients to achieve their optimum health through individualized evidenced-based care. Her interests include pediatrics, women’s health, dermatological care and preventative health. Lori speaks limited medical Spanish.

In her free time, Lori enjoys working out, cooking, gardening, traveling and visiting her grown children.


Meenal Lohtia, MD

Specialty: Family Medicine

Dr. Meenal Lohtia is a medical physician Board Certified in Family Medicine. Her current practice location is in Terra Linda. She grew up in India and completed medical school at University of Mumbai.

Dr. Lohtia completed her residency in family medicine at Underwood Memorial Hospital in New Jersey in 2002. She then worked as a full-time physician in a community-based practice in New Jersey for 3 years before moving to California.
Dr. Lohtia enjoys every aspect of family medicine including adult, pediatric, and adolescent medicine. She believes in providing complete medical care to the entire family as a unit.

In her practice, her special interests include community-oriented primary care and preventative medicine. She lives in Marin County with her husband and 2 children and enjoys cooking, reading and painting.


Raj Singh, NP

Specialty: Family Medicine

Rajdeep Singh is family nurse practitioner who joined Prima in January 2017. He completed his undergraduate studies at University of California, Davis in 2013, and trained to become a Masters-prepared Family Nurse Practitioner at Johns Hopkins University School of Nursing in Baltimore, Maryland. After 3 years in the East Coast, he is excited to be back in California, pursuing his lifelong dream of practicing family medicine.

In his free time, Raj enjoys nature, sports and medicine. He played basketball, football, and ran track in high school. Following this, he played intramural sports throughout college and continues to do so today. He roots for the 49ers, Giants and Kings.

Raj appreciates the intricacies of medicine, and enjoys the challenge of continuing to expand his body of knowledge and skillset over the course of his career. He hopes to become the best practitioner he can be, and is looking forward to developing lifelong patient-provider relationships.