Boomerang - Oakland – Webster

2923 Webster St. Ste. 202, Oakland, CA 94609

Fax: (844) 464-0622

Clinic Hours: MON – FRI 8AM – 5PM

Clinic Hours:

1st and 2nd Wednesday of each month from 9am to 4pm.

Schedule An Appointment

Current Patients:
Call to schedule: (510) 451-4142
New Patients:

Contact Our Boomerang - Oakland – Webster

Boomerang - Oakland – Webster - Providers


Carl Fieser, MD

Dr. Carl Fieser is a specialist in Interventional Pain and Physical Medicine and Rehabilitation with IPM Medical Group. Dr. Fieser holds board certification by the American Board of Physical Medicine and Rehabilitation as well as the American Board of Pain Medicine. Dr. Fieser received his medical education at the University of Kansas School of Medicine, where he also completed his internship and residency in Physical Medicine and Rehabilitation. He then completed a one year fellowship in Musculoskeletal Medicine and Interventional and Chronic Pain Management. As a Physical Medicine and Rehabilitation specialist, he focuses on using the latest non-surgical interventional techniques as part of a multidisciplinary approach to pain management. He strives to provide high quality compassionate patient care with an emphasis on improving function and quality of life. Dr Fieser has a special interest in Sports Medicine and is preparing for a board certification in that field. He is able to perform Electrodiagnostic Studies and is a Qualified Medical Evaluator (QME) for the California Workers’ Compensation System. He is also a healthcare entrepreneur with an interest in health related tech start-ups. Dr. Fieser was raised in Kansas and is an obsessive Kansas Jayhawk Basketball fan, as well as an Oakland A's fan. He also enjoys traveling and shooting medium format photography. Dr. Fieser is available to see patients in our Walnut Creek, Brentwood, and Oakland offices and is fluent in Spanish.


Diokson Rena, MD

Dr. Diokson Rena has been a practicing physiatrist for 20 years, the last 12 years has been with the group. Dr. Rena is board certified in physical medicine and rehabilitation with subspecialties in pain medicine and sports medicine. He studied physical therapy prior to medical school. He completed the residency in PM&R and fellowship in spine, sports and pain. He also trained in pathology.   Dr. Rena specializes in nonsurgical musculoskeletal care with special interest in interventional spine care. He is also adept in the California workers compensation system. When not working, Dr. Rena likes spending time with family and friends, traveling and simply enjoying what San Francisco has to offer.


Jacob Rosenberg, MD

Dr. Jacob Rosenberg has been treating pain for over 35 years and graduated from Vanderbilt University, the University of Maryland Medical School and then completed an anesthesia residency at the University of Texas Houston. He first began treating chronic pain when he was an assistant professor of anesthesiology at the University of New Mexico School of Medicine in 1984. After five years in private practice in Davis, California, he completed a pain management fellowship at the University of Utah School of Medicine, staying on as an assistant professor of anesthesia in pain management.  In 1995 he founded IPM (now Boomerang Healthcare), initiated a pain management fellowship program, and in 2002 started a multi-disciplinary functional restoration program along with Dr. Howard Rome. Dr Rosenberg’s philosophy for the treatment of chronic pain involves a partnership between the patient and physician. He understands that patients need information in order to make decisions and to take an active role in their care. His approach is to first identify any correctable pathology, then recommend options for managing pain and beginning rehabilitation. Dr. Rosenberg’s approach does not focus solely on interventions that provide temporary pain relief. His goal is to educate patients so that they can actively participate in treatment more effectively improving their function and quality of life. Dr Rosenberg is available for consultations and treatment of injured workers.


Matthew Johnson, DO

Dr. Matthew Johnson is a ABPMR Board Certified Physiatrist and Interventional Pain Management Specialist. He is originally from Missouri and graduated from the University of Missouri- Columbia with honors in Biology. Dr. Johnson completed his medical training at Western University in Southern California followed by a one year internship at Pacific Hospital of Long Beach. He completed a residency in Physical Medicine and Rehabilitation at the University of California-Irvine where he served as the Chief Resident during his final year. Following residency he completed a one year fellowship in interventional pain management. Dr. Johnson’s interests include neuropathic pain, back and neck pain, joint pain, headaches, fibromyalgia pain, abdominal pain, non-surgical management and rehabilitation of orthopedic issues and industrial injuries, and general debility. He also performs Electrodiagnostic Studies (nerve conduction studies and electromyography) to diagnose nerve problems. He is an expert in interventional pain techniques such as radiofrequency ablation, epidural steroid injections, selective nerve blocks, Botox administration, neuromodulation, and joint injections. Dr. Johnson is a Qualified Medical Examiner for the State of California Worker's Compensation system and is an expert in matters of disability and function. Dr. Johnson is available to see new patients immediately.


Natalia Balytsky, MD

Natalia Balytsky is an Anesthesiologist and pain management specialist with over 15 years experience. Studying medicine in Ukraine, Natalia transitioned to the Unites States to the University of Pittsburg and University of California San Francisco where she was a clinical fellow. Prior to joining the Sfmmg team, Natalia worked at Bay Area Orthopedic Surgery and Sports Medicine as a pain management specialist. Natalia brings valuable knowledge and experience to join our team of specialists and surgeons.


William R. Campbell, DO

Dr. Campbell is a Board Certified Orthopedic Surgeon treating Worker’s Compensation and Private Health Insurance patients in the Bay Area since 2007.  Treatment offices include, San Francisco, Oakland, and Sacramento. With thousands of cases worth of experience, Dr. Campbell brings a well-honed skill set to those patients in need of surgical treatment for their shoulder, knee and general Orthopedic injuries.  However, every patient is different, and many times good results can be obtained without heavy medication, aggressive treatment or surgery. Dr. Campbell derives a great deal of satisfaction working with his patients as they choose from the various treatment options that best match their goal. Dr. Campbell is almost universally accepted in all the various MPN’s (including the recently updated SCIF/Harbor Health Systems) as well as Private Health Insurance carriers (including Brown & Toland). Dr. Campbell is also an Orthopedic Q.M.E. and has been recognized as AME on multiple occasions by firms such as Ratto, Hanna Brophy, Boxer & Gerson, Laughlin Falbo and others.  Practicing within the worker’s compensation arena for almost a decade has produced a keen understanding of the various issues surrounding AOE/COE, TTD, disability rating, apportionment, future medical care and the various other complexities of the med-legal evaluation process. Dr. Campbell maintains several Med-Legal Offices (see below). Dr. Campbell attended medical school at the Chicago College of Osteopathic medicine. Later, he completed his orthopedic surgical residency in the Michigan State University system, and fellowship at the University of Texas Medical Branch. To Schedule Please Call: Debbie Nunez / P: (415) 805-8135 / F: (415) 294-3698 San Francisco, Oakland, Sacramento Treatment Offices – (415) 409-7364 San Francisco, Oakland


Eric Beane, PA

Eric Beane is a California licensed Physician Assistant (PA) at the Brentwood, Walnut Creek and Oakland locations. He graduated from Samuel Merritt University with his Master of Physician Assistant and is certified by the National Commission on Certification of PAs. Eric has also completed extensive graduate work in Kinesiology with an emphasis in rehabilitation at California State University, East Bay while concurrently working as a Physical Therapist Aide. Previously, he conducted various philanthropic and volunteer work, including traveling to Ecuador, to provide compassionate care to the underserved population. Eric was born and raised in the San Francisco Bay Area and currently lives in the East Bay. 

In his free time, Eric is pursuing his private pilot’s license, is an avid free diver and swimmer, including participating in annual swims from Alcatraz Island to the San Francisco Marina District’s Aquatic Park. 


Julie Ginsburg, L.Ac

Julie Ginsburg is a California Licensed Acupuncturist specializing in pain management and wellness. She graduated from San Francisco State University receiving her Bachelors of Science in Biology Concentration in Microbiology, Minor in Chemistry, graduating with honors having completed the pre-Health Professional curriculum.  While at SFSU, Julie conducted independent research in molecular biology and was awarded a National Science Foundation Grant. Julie’s interest in health led her to work in both Pharmaceutical Research and Development and in Clinical Research coordinating trials for Parkinson disease, stroke/CVA, Alzheimer disease, multiple sclerosis and migraine headache therapeutics. Taking a break to raise her own children, Julie re-connected with her love of science and passion for promoting wellness by studying Eastern Medicine and Qigong.  She earned her Masters of Science in Traditional Oriental Medicine from Acupuncture and Integrative Medicine College in Berkeley where she graduated Magna Cum Laude in 2014. Julie also teaches Qigong exercises having completed ACTCM’s Qigong Teacher Training Program in San Francisco with the late Dr. Suzanne Friedman.  One of Julie’s strengths as an Acupuncturist is being able to bring her strong foundation in science to inform her ability as an integrative holistic healer. She is particularly interested in supporting her patients’ wellness and promotes balance in addressing pain, trauma, stress, headaches, insomnia, hormonal imbalances, PMS, fatigue, depression, and anxiety. Julie brings a very compassionate presence to her treatments and strives for a painless approach in practicing acupuncture.