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John Leon Gruen, MD

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My specialty:
Internal Medicine

My provider affiliation:
Kaiser Permanente provider

I speak: English, Romanian

My gender: Male

Where I practice

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Available services
  • Emergency service
  • Urgent care services
  • After-hours services
  • Pharmacy services
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About me

Welcome, and thanks for visiting my Web page. For over 19 years, I have been on staff at Kaiser Permanente Panorama City. I have worked both in inpatient services and outpatient services, urgent care, and in the hospital as an internal medicine consultant.


I was raised here in Southern California, and attended college at UCLA. I am an observant Jew. This is important for my patients to know, because in observance of the Sabbath, I do not work on Friday afternoons or on any of the major Jewish festivals.

About my practice

At this point in my career, I primarily see patients in the office, and work less in the hospital. I strongly believe in preventive care. However, I always remind my patients that it is not what I do in the office that will determine the health outcome; it is what you do outside the office. A healthy diet and lifestyle form the foundation of health, as well as a positive mental attitude. I believe it is important to use whatever safe and effective tools will help a patient. For this reason, I use herbal medications as part of my practice. I have a very diverse practice, and I like to develop the sort of relationship with my patients so that they feel comfortable discussing anything on their minds. This is critical to understanding how to help a particular individual.

How I thrive

To maintain my own health, I exercise regularly, I do not smoke, and I follow a healthy diet of predominantly fruits and vegetables. I eat meat no more than twice a week, and drink in moderation. Torah values play a major role in my life and serve as a moral compass. I meditate, and study the Talmud weekly. I try to have the best relationships with my family and friends that I can. For relaxation, I love to listen to all kinds of music.

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My office

Languages spoken by medical staff

Help is available in your language. Learn more.

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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
Internal Medicine Department
13640 Roscoe Blvd, Panorama City, CA 91402

Contact information

  • Appointments/Information
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • California Relay Service
  • 711 (TTY for the hearing/speech impaired)
  • General Information
  • 1-800-272-3500 (toll free)
  • General Information
  • 818-375-2000
  • Hospitalized patient information
  • 818-375-2000

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My training, certifications and licensing

Medical school

Universitatea De Medicina Si Farmacie Cluj-Napoca
Cluj-Napoca , Romania

Board certification

This information is not available at this time.

Medical training


Internal Medicine

Mount Sinai Hospital Medical Center of Chicago
Chicago , IL


Internal Medicine

Mount Sinai Hospital Medical Center of Chicago
Chicago , IL

Joined Permanente Medical Group


Active license information

License number


License type


License issuing state


National Provider Identifier (NPI)

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My hospitals

This information is not available at this time.

To find:

  • a provider's office hours, search our facility directory
  • 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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