At the Napa Pain Institute, our mission is to inspire hope and contribute to the health and well-being of our community here in the Bay Area by bringing more than two decades of experience in whole-patient care to the management of chronic pain.  Our work is driven by our core value: the needs of our patients come first.

Our Story

The Napa Pain Institute was founded in 1992 by Dr. Eric Grigsby, a national leader in the field of Pain Management who has devoted his life to advancing techniques and treatment methods to alleviate chronic pain. At the Napa Pain Institute, our providers seek a thorough understanding of the origin of patients’ pain issues and offer the latest techniques for the treatment of chronic pain. Through integrated clinical practice, research, and education, our caring, committed team are your partners in whole-patient health care, offering world-class treatment and support for those suffering from a range of debilitating chronic illnesses that result in ongoing pain.

Eric Grigsby, MD, MBA

Eric Grigsby, MD, MBA

Dr. Eric Grigsby enjoys a national reputation for excellence in the field of Pain Management. He has a background as a researcher, teacher and clinician, and brings over 25 years of clinical experience to the Napa Pain Institute. Dr. Grigsby attended elementary and secondary school in his hometown of Knoxville, Tennessee, and received a Bachelors Degree in Biology and Economics from Brown University in Providence, Rhode Island. He formed an interest in Pain Management as a career while working at Boston Children’s Hospital in the Department of Orthopedic Surgery.

After graduating from Boston University Medical School in 1984, Dr. Grigsby trained in General Surgery, Anesthesiology, and Pain Management at the Mayo Clinic in Rochester, Minnesota. He was then invited to join the Medical Staff and teach at the Mayo Medical School until moving to California in 1989. The Dean of the University of California at Davis Medical Center then invited Dr. Grigsby to establish their first Pain Management Center, where he served as Medical Director until 1992. Following his post at UC Davis, Dr. Grigsby established his private Pain Management practice in Napa, California.

Today, he and his staff of over 50 professionals consult with patients from throughout Northern California and the western United States, and now Kauai and the Hawaiian Islands. More recently, Dr Grigsby completed his Masters in Business Administration from Duke University’s Fuqua School of Business. He speaks nationally on topics such as non-operative treatment of spinal disorders, the safe use of medications for treatment of pain, and the legal and regulatory issues relating to proper treatment of patients with chronic illness.

Avinash Ramchandani, MD, MA

Avinash Ramchandani, MD, MA

Dr. Avinash Ramchandani is a native Californian who is board certified in physical medicine and rehabilitation and pain management. He received his B.A. Molecular in Cell Biology from UC Berkeley. After he completed his undergraduate degree, he attained his M.S. in 2001 and M.D. in 2005 from the Rosalind Franklin University, the Chicago Medical School. He did his internship at St. Mary’s Medical Center in San Francisco, California, and residency in Physical Medicine and Rehabilitation from Stanford University in Palo Alto, CA. After residency, he completed his fellowship in Pain Medicine at the Oregon Health and Science University in Portland, Oregon. Dr. Ramchandani completed dual Master degrees in Business Administration from the Johnson Business School at Cornell University and Queens University in Kingston, Ontario, Canada.

Dr. Ramchandani incorporates pain procedures, nutrition, exercises, and medications to customize treatment options for patients in pain. He enjoys being on the cutting edge of proven treatments for pain management and believes in optimizing the functional being so that pain is controlled and people may live with the highest degree of dignity.

Dr. Ramchandani is married and has two young children who he enjoys spending time with. He is an avid baseball and football fan and loves the San Francisco Giants and 49ers. He has an interest in writing and is published in several journals and national and international periodicals. He also enjoys running, golf, swimming and exercising.

Konstantin Inozemtsev, MD

Konstantin Inozemtsev, MD

Dr. Konstantin Inozemtsev grew up in Canada, where he received his Bachelor’s Degree in Biology from Queen’s University in Kingston, Ontario while working as a Medical First Responder. He graduated from Saba University School of Medicine in Netherlands-Antilles. He trained in Anesthesiology and Pain Management at Cook County Hospital in Chicago, Illinois, where he served as Chief Resident and Illinois State Representative for the resident section of the American Society of Anesthesiologists. Having developed a special interest in interventional management of pain, he went on to complete a fellowship in Pain Management at Dartmouth College in Lebanon, New Hampshire.

Dr. Inozemtsev believes in a comprehensive, biopsychosocial approach to pain management which addresses all areas contributing to pain and healing. He has a particular interest in emerging technologies including neuromodulation and ultrasound-guided interventions and makes restoring function and improving quality of life the primary goal for all of his patients. He also has a keen interest in scientific research and medical education.

Dr. Inozemtsev is married and enjoys spending his time on culinary experiments, gravel cycling, and hiking with his dog and cat.

Gordon Iwasaki, PA

Gordon Iwasaki, PA

Gordon Iwasaki is a physician assistant with over twenty years of experience. He began his career in orthopaedics and industrial medicine. He has been working in pain management over the past seven years.

Mr. Iwasaki was raised in South San Jose and attended UC San Diego for his undergraduate degree. Later, he attended Charles Drew University in Los Angeles for his physician assistant studies and obtained his master’s from University of Nebraska. He has been residing throughout Southern California in Los Angeles, Riverside, and San Diego counties. He returns to Northern California to be closer to his family.

He remains a diehard 49ers and SF Giants fan and enjoys exercising and spending time with his canine companions and listening to music.

As your treatment at the Napa Pain Institute continues, we may ask you to provide us with more information, or share information with you — find more forms and information on the Patient Resources page.

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