Westside Pain Specialists (Dr. James Nassiri)

Westside Pain Specialists is an interventional pain management practice led by James A. Nassiri, MD, MA, with offices in Beverly Hills, Rancho Cucamonga and Newport Beach, California.

Clinicians

• James A. Nassiri, MD, MA — diplomate of the American Board of Anesthesiology and the American Board of Pain Medicine

Regenerative treatments offered

• PRP injections
• Bone marrow aspirate concentrate (BMAC) — bone marrow collected from the pelvic bone under local anesthesia and injected under ultrasound or fluoroscopic guidance
• Exosome therapy — in-office targeted injections; source not stated
• Regenerative cell therapy and amniotic allograft

Conditions the practice lists

For BMAC and exosome therapy: osteoarthritis of the knee, hip or shoulder, meniscus and cartilage injuries, rotator cuff tears, tendon and ligament injuries, chronic joint pain and sports-related injuries. The practice also treats back, neck and elbow pain, sciatica and headaches with other pain management procedures.

What to know before you call

• Beverly Hills: 435 N Bedford Drive, Suite 216; appointments 323-741-3104, general inquiries (310) 273-2000
• Rancho Cucamonga: 9461 Pittsburgh Ave, Suite A; appointments 909-275-7976
• Newport Beach: 4700 Von Karman Avenue, Suite 101; 714-499-9980
• Insurance networks listed include Aetna, Blue Cross Blue Shield, Cigna, GEHA, Medicare, Premera Blue Cross, UnitedHealthcare and WellPoint; coverage for regenerative treatments is not stated

RPG verification notes

• Board certifications listed on the website
• Prices not published
• No FDA statement seen on the BMAC or exosome pages

Last verified by Regen Provider Guide: October 2026. Confirm treatment details, candidacy, insurance coverage and costs directly with the practice. RPG makes no claim about the effectiveness of any treatment.