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Peter J. Lennarson, MD

Photo of Peter J. Lennarson, MD

My specialty:
Neurological Surgery

My provider affiliation:
Kaiser Permanente provider

I speak: English

My gender: Male


Find out about

Where I practice

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About me

Although my family was originally from New York, I mostly grew up in the Midwest. I graduated from the University of Wisconsin with a Bachelor of Science in pre-medicine and also completed a major in Spanish language which afforded me the opportunity to study and live in Spain during college. Having returned from my European travels and convinced that I wanted to dedicate myself to medicine, I attended medical school at the University of Wisconsin. I then completed my residency in neurological surgery at the University of Iowa. Along the way, I joined the United States Air Force and spent time on active duty as a neurosurgeon, which included a stint in the desert in 2004 in support of Operation Iraqi Freedom as the first Air Force neurosurgeon deployed. After 4 exciting years, I left the Air Force to join the ranks of academic neurosurgery at the University of Nebraska, where among other accomplishments I was medical director of the newly created Spine Center and chief of Neurosurgery at the Omaha VA Medical Center. In 2013, I embarked on a new chapter in my career when we moved to Denver to begin my work at Kaiser Permanente.

About my practice

While having practiced the full breadth of neurosurgery, my work has increasingly focused on the many complicated spine problems from which so many suffer. From outpatient, minimally invasive surgeries to large, complex deformity operations, there is no problem too little or too great that does not interest me. As a surgeon, it is still my hope to help you in non-surgical ways when possible, but I will be committed to developing whatever plan is required to solve your problems. I will respect you as a partner in maintaining your health and will listen and seek to understand your questions and concerns so that we can work together to make treatment plans that meet your needs. You can also gain a better understanding of your health by accessing your medical record, prescription information and lab results at

How I thrive

I have a passion for my work and continue to study and learn the science and art of neurosurgery and spine surgery even outside the traditional work environment. I am often engrossed in contemplating a new treatment or surgical procedure and figuring out how I can adopt it to better the lives of my patients. Outside of my profession, I enjoy the Colorado outdoors including hiking, trail running, biking, skiing, fishing and camping. Best of all is when I can combine these activities with my wife and 5 boys.

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My office

Languages spoken by medical staff

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Medical groups and plans

Colorado Permanente Medical Group

Neurosurgery Department name
2045 Franklin Street, Denver, CO 80205
List Header Plans Accepted
  • HMO
  • Medicare Senior Advantage

Contact information

  • Appointments/Cancellations/Information
  • 303-338-4545

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My training, certifications & licensing

Medical school

University of Wisconsin School of Medicine
Madison , WI

Board certification

Neurological Surgery

AM BD of Neurological Surgery

To verify board certification for an individual practitioner, please visit the American Board of Medical Specialties, the American Medical Association, or the American Osteopathic Association websites.

Medical training


Surgery, Neurology

University of Iowa Hospitals and Clinics
Iowa City , IA

Joined Permanente Medical Group


Provider ID

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My hospitals

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Information in this online directory is updated periodically and applies to commercial plans underwritten by Kaiser Foundation Health Plan of Colorado. The availability of physicians, hospitals, providers, and services may change. To verify whether a provider accepts Kaiser Permanente plans, contact the provider directly. Current provider information is available at This information is updated within 72 business hours of receipt from providers. Kaiser Permanente of Colorado attempts to ensure the online directory contains up-to-date information. However, providers are responsible for notifying of any changes to their information, and untimely communication may result in outdated provider information appearing on the website. The printed directory is current as of the date of publication. Kaiser Permanente is not responsible for use of outdated directories.

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 the 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.

Information about a practitioner is provided to us by the practitioner or the practitioner's network, or is obtained as part of the credentialing process. An authorization or referral may be required to access some providers in this directory. If you have questions, contact Member Services.

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The TTY number is now 711 for all KPCO

You can also call the State of Colorado Board of Medical Examiners at (303) 894-7690.

Referrals to affiliated/contracted physicians/providers in Denver/Boulder

Affiliated/contracted physicians/providers are not part of the Colorado Permanente Medical Group (CPMG). They are physicians/providers who have a contract with the CPMG.

If your CPMG physician decides that you require covered services not available internally from CPMG, he or she will refer you to an affiliated/contracted physician/provider.

You must have a written referral to the affiliated/contracted physician/provider in order for Kaiser Permanente Colorado to cover the services. A referral is a written authorization from Kaiser Permanente for you to receive a covered service from an affiliated/contracted physician/provider.

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