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Leo Toshinori Kroonen, MD

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My specialty:

My provider affiliation:
Kaiser Permanente provider

I speak: English

My gender: Male

Where I practice

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About me

Thanks for visiting this page to learn more about me. I am an orthopedic surgeon with subspecialty training in hand and upper extremity surgery. My philosophy is that you and I can work together to determine the best remedy for whatever it is that ails you and your hands and arms.


I grew up in Palm Desert, CA, and spent most of the time in the pool trying to stay cool. I moved on to Stanford (Go Cardinal!) for my undergraduate degree in human biology, followed by medical school in Philadelphia. I went through medical school on a scholarship from the United States Navy, and after graduation, I completed a surgical internship at Naval Medical Center San Diego. I spent two years with the 1st Marine Division, including a deployment with the 2nd Battalion, 5th Marines as their Battalion Surgeon during the invasion of Iraq. I then went through orthopedic surgery residency back at Naval Medical Center San Diego, followed by a fellowship in hand & microvascular surgery at the Philadelphia Hand Center. I returned to Naval Medical Center San Diego as staff, and deployed for seven months to Afghanistan in 2012, where I had the honor of caring for our sailors, soldiers, and Marines. I joined Kaiser Permanente when I completed my service in 2014.

About my practice

My practice primarily involves surgery of the hands, wrists, forearms and elbows. I love the intricacy of hand surgery in everything from the fairly common conditions such as carpal tunnel and trigger finger, to the latest advances in peripheral nerve surgery, arthroscopic surgery, and reconstructive surgery. By being active in several national and international medical organizations, I feel I can always provide high-quality evidence-based care to you, my patients. My clinic staff and our team of therapists are an integral part of the care team. Together we will all work with you to get you back to functioning at your best.

How I thrive

I thrive with the personal interactions I have with my family, colleagues, and patients each day. I love the water, and enjoy an early morning surf or an evening swim with my local masters program. I find mind and body relaxation from building and shaping hollow wooden surfboards. In the fall, you can find me glued to Stanford football games. My best time, though, is the time I spend with my wife and two children learning new things, experiencing new activities, and just hanging around together.

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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
Orthopedics Department
4650 Palm Ave, San Diego, CA 92154

Contact information

  • Advice/appointments/cancellations/messages
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • California Relay Service
  • 711 (TTY for the hearing/speech impaired)
  • Information
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • Pharmacy information/refills by phone
  • 1-866-385-2645 (toll free)

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My training, certifications and licensing

Medical school

Hahnemann University Medical College of Pennsylvania
Philadelphia , PA

Board certification

Orthopaedic Surgery

American Board of Orthopaedic Surgery

Surgery of the Hand

American Board of Orthopaedic Surgery

Medical training


General Surgery

Naval Medical Center
San Diego , CA


Orthopedic Surgery

Naval Medical Center
San Diego , CA


Hand Surgery

Thomas Jefferson University Hospital
Philadelphia , 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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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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