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Brett Matthew Lowenthal, MD

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My specialty:

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 a pathologist and consider myself very fortunate to be part of the San Diego group at Kaiser Permanente. The Department of Pathology strives to provide excellent diagnostic and laboratory management as a part of your overall care at Kaiser Permanente.


I am a Southern California native who was born in Newport Beach, but grew up in Del Mar. I graduated from University of California Berkeley with an undergraduate degree in Molecular and Cell Biology prior to obtaining my medical degree from Wake Forest University School of Medicine in North Carolina. It was during my medical school training that I found Pathology to be the most interesting field because it focuses on diagnostics with an integration of cellular biology and is at the forefront of scientific innovations. I returned to San Diego to complete my Anatomic and Clinical Pathology residency and Surgical Pathology fellowship at University of California San Diego. It was during residency that my interest peaked in gastrointestinal, pancreatobiliary, and liver pathology, and I decided to complete a second fellowship at University of Pittsburgh Medical Center in this subspecialty. I am honored to be a part of Kaiser Permanente.

About my practice

As a surgical pathologist, I am involved in the care of our patients by diagnosing diseases upon gross and microscopic examination of surgical and biopsy specimens. These diagnoses help our clinical colleagues determine and guide appropriate treatment regimens, clinical care, and follow up for our patients. My subspecialty includes gastrointestinal, pancreatobiliary, and liver pathology.

How I thrive

I am privileged to be practicing pathology in my hometown surrounded by family and friends! As a new father, I enjoy every moment spent together with my wife and daughter. I find my work-life balance by enjoying all San Diego has to offer in outdoor activities, community events, and great restaurants.

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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
Laboratory Department
4647 Zion Ave, San Diego, CA 92120

Contact information

  • Admitting
  • 619-528-0140
  • Advice/Appointment/Cancellations
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • California Relay Service
  • 711 (TTY for the hearing/speech impaired)
  • Operator
  • 619-528-5000
  • Pharmacy information/refills by phone
  • 1-866-370-1958 (toll free)

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My training, certifications and licensing

Medical school

Wake Forest University Bowman Gray School of Medicine
Winston-Salem , NC

Board certification

Pathology-Anatomic and Clinical

American Board of Pathology

Medical training


Anatomic/Clinical Pathology

University of California, San Diego
La Jolla , CA


Surgical Pathology

University of California, San Diego
La Jolla , CA


Gastrointestinal/Liver Pathology

University of Pittsburgh Medical Center-Presbyterian University Hospital
Pittsburgh , PA

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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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

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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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