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We offer treatments for neck and back pain, arthritis, and sciatica. Call us to book your appointment today.



James A. Nassiri, MD, MA

Pain Management Specialist & Anesthesiologist located in Beverly Hills, CA & Rancho Cucamonga, CA


At Westside Pain Specialists, located in Beverly Hills and Rancho Cucamonga, California, Dr. James Nassiri uses his rich background in treating patients with a wide variety of acute chronic pain conditions. Patients from throughout the Los Angeles area benefit from his expertise in treating arthritis, back, neck, knee, and shoulder pain, and sciatica with platelet rich plasma injections and other innovative pain management techniques.

Dr. Nassiri’s educational path began in his hometown at the University of Southern California, where he graduated with Honors, earning a degree in Exercise Science. From there, his journey took him to the East Coast, where he achieved a Master’s Degree and Medical Doctorate from the Boston University School of Medicine. Dr. Nassiri then returned to his beloved Los Angeles, expanding his medical knowledge with an internship in general surgery, with residency training in Anesthesiology, and is now double-board certified in Anesthesiology and Pain Medicine. He is a diplomat of the American Board of Anesthesiology and the American Board of Pain Medicine. 

Using his extensive training, Dr. Nassiri treats both chronic pain conditions, as well as seeks to promote awareness of these extremely debilitating ailments. His primary focus is tailoring treatments to suit specific patient needs, working to improve their lives as effectively as possible. Due to his background, Dr. Nassiri is now a Senior Consultant at HealthHelp, and was recently promoted to Medical Director of the Pain and Musculoskeletal Program. Dr. Nassiri has been asked to review and provide his expert medical opinion in the legal field, working with attornies to assist with complex cases.

Dr. Nassiri sums up his commitment to patients thusly: "My primary focus is to listen to the patient's pain condition because healing begins with recognition."

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Dr. Nassiri's Blog

 How Spinal Cord Stimulation Works to Manage Pain
How Spinal Cord Stimulation Works to Manage Pain

Chronic back pain can be a difficult issue to treat, particularly when symptoms persist long after an injury heals. The nervous system and spinal cord are complex structures that can sometimes behave in unusual and unexpected ways.

3 Fast Facts About Hyperbaric Oxygen Therapy
3 Fast Facts About Hyperbaric Oxygen Therapy

The only time many people hear about hyperbaric oxygen therapy is in the context of treating scuba divers who are suffering from the effects of sudden pressure changes. It’s also a proven therapy for a variety of health issues.



At Westside Pain Specialists, our goal is to provide every patient the opportunity to obtain the pain treatment they need. We are dedicated to partnering with you and your insurance. If you have any questions about the insurance policies we accept, please call our office to find out how we can partner with you and begin your healing process.

Blue Cross Blue Shield
Blue Cross Blue Shield of California PPO
United Healthcare
Well Point

Words from our patients

  • Vitals

    "Dr. Nassiri is a very nice and caring man, and has a lovely bedside manner."

    Verified Patient
  • Yelp

    "After a year of trying to solve my terrible lumbar pain with other doctors with no real relief, Dr. Nassiri has finally helped to get me substantial pain relief."

    Andy L.
  • RateMDs

    "He was the first doctor that actually listen to me while I explained the back and leg pain I was experiencing."

    Verified Patient
  • Yelp

    "My husband had to do a few epidural and it was hassle free and quick. He is an expert. My husband has been feeling really better, we are happy."

    Peachy P.
  • Yelp

    "He was amazing and made a scary situation very calming."

    Holly G.
  • Yelp

    "Dr. Nassiri really is gifted at finding the source of pain so that you can get your body functioning the way it should...excellent at finding the right pain management."

    Mike R.
  • Yelp

    "This doctor is God sent! I used to be miserable with neck pain and no one could help me...Then I met Dr. Nassiri."

    Theo S.
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