Doctor Using Digital Tablet


Since 1984 Dr. Fein's mission has been to explore the relationship between infectious and auto-immune diseases. In her 30 years of experience she has seen many patients previously diagnosed with auto-immune diseases, Fibromyalgia or Chronic Fatigue Syndrome with underlying chronic infections. A finding validated by peer-reviewed medical literature. As a Rheumatologist and Internist she has become one of leading doctors in the country for the diagnosis and treatment of Lyme, Bartonella, Chronic Fatigue Syndrome, Fibromyalgia and other infection related chronic illnesses. For example, she was the first to report cases of Bartonella in patients with Lyme Disease, and proposed it was a tick-borne infection.


In addition to her practice Dr. Fein has appeared as an expert in various mediums. Dr. Fein co-authored Beating Lyme Disease, wrote the forward to Confronting Lyme Disease and was featured as a top diagnostician on Medscape. She has also appeared on Mystery Diagnosis on the Discovery channel.

Since 1993 Dr. Fein has had more than 14 public speaking roles at major medical conferences. She has been a member of the National Lyme Caucus (drafted legislation to create a national committee for Lyme), the National Health Legislation Task Force, and an Advisor to the Lyme Disease Foundation. In 2008 she was the Master of Ceremonies at a landmark conference bringing together practitioners treating Lyme Disease as well as those treating Chronic Fatigue Syndrome for the first time. She is both an experienced researcher, through grants from Hoechst labs as well as Pfizer pharmaceuticals, and a seasoned public speaker.

Dr. Fein holds both an MPH in Epidemiology and Biostatics from Columbia University and an MD with distinction from George Washington University Medical School.  She has been in practice since 1986 and has taught Epidemiology to medical and public health students at Columbia University and Mt. Sinai Hospital. She has also taught Internal Medicine residing at Mt. Sinai in NYC followed by Rheumatology Fellowship at NYU. She currently serves as an Adjunct Asst. Professor at Rutgers.

Doctor with Files


Routine Exams


We work with you to schedule the best times for exams that fit into your routine.

In-House Blood Work


Complete blood counts, sedimentation rates, comprehensive chemistry panels, lipid panels, CPK, iron and uric acid levels.

Infusion Therapy


In-house infusion therapy of both antibiotics and hydration (with or without vitamins and minerals).

Tick Identification


We remove, identify, and send ticks out for comprehensive testing of all tick-borne pathogens.




“Don't know where i'd be without Dr. Fein. in many ways, she saved me!! she is the smartest physician I have ever known, and her compassion for her patients is quite simply amazing. I have been her patient since 1992, and I don't trust anyone else. thank you Dr. Fein for being there all these years and helping me to the best of your ability, which is high praise!!!!”

—  Cathy O'Hern Jansen


Our Address

1099 Bloomfield Ave

West Caldwell, NJ 07006
Tel: 973-575-0338 

Opening Hours

Monday – Tuesday


Thursday - Friday


9:00AM – 5:00PM


9:00AM – 5:00PM