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Nelson Barritt Arnstein, MD

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My specialty:
Nuclear Medicine

My provider affiliation:
Kaiser Permanente physician

I speak: English

My gender: Male

Where I practice

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About me

Welcome to my Web page. I am happy to have this opportunity to introduce myself as a physician and director of nuclear medicine at Kasier Permanente Downey Medical Center. Nuclear medicine, which uses radioactive materials to diagnose and treat disease, offers many useful tools and touches all other fields of medicine.


Born in Sharon, Connecticut, I was raised in New York City, where I later attended the Mount Sinai School of Medicine. However, California has always been a major draw for me. I attended Pomona College in Claremont and later lived in Santa Monica while teaching at Los Angeles County Hospital and USC Medical Center for 11 years. I then worked for six years as a medical reviewer for the U.S. Food and Drug Administration. In October 2002, I joined Kaiser Permanente.

About my practice

Clinical nuclear medicine offers the opportunity to interact with referring physicians, technologists, and, most importantly, our members. I find that taking a caring, compassionate attitude toward a member makes him or her more comfortable, which in turn helps the procedures I perform to go smoothly. In nuclear medicine, radioactive materials are used to discover possible illnesses and also as a form of therapy. I work closely with the other radiologists to correlate our images with CT, MRI and conventional X-ray images.

How I thrive

My hobbies include photography, astronomy, classic rock and roll music, the history of manned spaceflight, running, and triathlons, including marathons and Ironman 70.3 events. More recently, I have supported running events for disabled athletes, such as amputees from the wars in Iraq and Afghanistan. Perhaps my favorite hobby is collecting artifacts from the great ocean liners, including the Lusitania, Titanic, and Normandie. In 1956, I sailed on the original RMS Queen Mary, which I see now in Long Beach! More recently, I have collected original artifacts from the Apollo space missions, reproductions of which are now on permanent display at the Kaiser Permanente Downey Medical Center.

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My office

Languages spoken by medical staff

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My provider type

Physicians and Surgeons

Medical groups and plans

Southern California Permanente Medical Group

List Header Plans Accepted
  • Exclusive Provider Organization (EPO)
  • HMO
  • Medi-Cal Managed Care
  • Point-of-Service Plan (POS)
  • Senior Advantage/Medicare Cost
Nuclear Medicine Department
9333 E Imperial Hwy, Downey, CA 90242

Contact information

  • Advice/appointments/cancellations/messages
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • Appointments/information
  • 1-800-800-7990 (toll-free TTY for the hearing/speech impaired)

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My training, certifications and licensing

Medical school

Mount Sinai Medical Center
New York , NY

Board certification

Nuclear Medicine

American Board of Nuclear Medicine

Medical training


Internal Medicine

Long Island Jewish Medical Center
New Hyde Park , NY



Johns Hopkins University School of Medicine
Baltimore , MD


Nuclear Medicine

Georgetown University Hospital
Washington , DC


Nuclear Medicine

University of Michigan Hospitals
Ann Arbor , MI

Joined Permanente Medical Group


Active license information

License number


License type


License issuing state


National Provider Identifier (NPI)

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My hospitals

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To find:

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  • providers in your plan or accepting new patients, call 1-800-464-4000 (toll free) or 711 (TTY for the hearing/speech impaired)

The information in this online directory is updated periodically. The availability of physicians, hospitals, providers, and services may change. Information about a practitioner is provided to us by the practitioner or is obtained as part of the credentialing process. If you have questions, please call us at 1-800-464-4000 (toll free). For the hearing and speech impaired: 1-800-464-4000 (toll free) or TTY 711 (toll free). You can also call the Medical Board of California at 916-263-2382, or visit their website.

We want to speak to you in the language that you’re most comfortable with when you call or visit us. Qualified interpreter services, including sign language, are available at no cost, 24 hours a day, 7 days a week during all hours of operations at all points of contact. We do not encourage the use of family, friends or minors as interpreters. Only the services of interpreters and qualified staff are used to provide language assistance. These may include bilingual providers, staff, and healthcare interpreters. In-person, telephone, video, and alternative modes of communication are available. Learn more about interpreter services

If you would like to report an error in provider or facility information, please contact us.

Kaiser Permanente enrollees have full and equal access to covered services, including enrollees with disabilities as required under the Federal Americans with Disabilities Act of 1990 and Section 504 of the Rehabilitation Act of 1973.

Kaiser Permanente uses the same quality, member experience, or cost-related measures to select practitioners and facilities in Marketplace Silver-tier plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business.The measures may include, but are not limited to, HEDIS/CAHPS performance, member/patient complaints, patient safety scores, hospital quality measures, and geographic need. Members enrolled in KFHP Marketplace plans have access to all professional, institutional and ancillary health care providers who participate in KFHP plans’ contracted provider network, in accordance with the terms of members’ KFHP plan of coverage. All Kaiser Permanente Medical Group physicians and network physicians are subject to the same quality review processes and certifications.
Kaiser Permanente uses the same geographic distribution consideration to select hospitals in Marketplace plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business. Accessibility of medical offices and medical centers in this directory: All Kaiser Permanente facilities are accessible to members.


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