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Jason Robert Castillo, MD

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My specialty:
Dermatology:mohs Surgery

My provider affiliation:
Kaiser Permanente provider

I speak: English

My gender: Male

Where I practice

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About me

Welcome to my Web page. I am pleased to join Kaiser Permanente as a Mohs Surgeon and Dermatologist. Hopefully this biography gives you a brief introduction as to who I am.


I grew up in Clovis, California, in the Central Valley. I chose to be in the founding class at UC Merced, which is where I solidified my interest in medicine. My interest in Dermatology grew during my medical school training at UC San Francisco as the specialty combines procedures with continuity of care while getting to truly know your patients. During my internship at UC Irvine, I was chosen as Intern of the Year based on my patient care. I furthered my training in both Dermatology and Mohs during my residency at Harbor-UCLA Medical Center, where I was chosen to serve as chief resident my final year. Following completion of my residency, I moved to Rochester, Minnesota, to complete a Micrographic Surgery and Dermatologic Oncology/Mohs Fellowship at the Mayo Clinic under doctors who were all leaders in the field of Dermatologic Surgery.

About my practice

An ideal health care professional is an individual who puts patient care as the top priority. You can expect on the day of surgery that I will make sure that you understand the procedure and the entire healing process as well as answer any questions you may have. My job is to remove your skin cancer, take the best surgical approach, and minimize the removal of normal surrounding skin. The Mohs procedure offers the lowest risk of recurrence while minimizing the appearance of the scar. My other interests in Dermatology include cancer surveillance in high-risk patients (those with rare tumor types, transplant patients, immunosuppressed patients), sclerotherapy, complex medical dermatology, and cosmetics.

How I thrive

I believe a physician should lead a healthy and balanced life. When not in the office, you may find me swimming, working out at the gym, cooking new recipes, or chasing my 2 adorable nephews throughout Disneyland.

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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
Mohs Department
6 Willard, Irvine, CA 92604

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)

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My training, certifications and licensing

Medical school

UC San Francisco Medical Center
San Francisco , CA

Board certification


American Board of Dermatology

Medical training


Internal Medicine

University of California, Irvine California College of Medicine
Orange , CA

Chief Resident


Harbor-UCLA Medical Center
Torrance , CA



Harbor-UCLA Medical Center
Torrance , CA


Micrographic Surgery and Dermatologic Oncology

Mayo Clinic
Rochester , MN

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:

  • 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

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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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