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Marlon Guerrero

Marlon Guerrero, MD

4.9670 ratings

Surgical Oncology

Video Visit
Accepting New Patients

Highlights

Age Groups Seen

  • Pediatrics
  • Teenagers
  • Adults
  • Geriatrics

Languages

  • English

Provider Gender

Male

About Marlon Guerrero and Banner Safety Practices

Care Philosophy

I use a Multidisciplinary Endocrine Team to provide every patient with quality and comprehensive care. I perform broad based surgical procedures to endocrine diseases, from minimally invasive surgeries (single incision laparoscopy, Robotic surgery, minimally invasive parathyroid and thyroid surgeries), to conventional open and complex operations. Our team uses comprehensive national guidelines and new innovation to provide cutting edge care for all of our patients.

Specializing In

Fellowship Trained Endocrine Surgeon specializing in:
1. Thyroid Cancer (Initial and Recurrent Disease)
2. Thyroid Nodules/Masses (Initial workup and long-term management)
3. Parathyroid Disease (Primary, Secondary, and Tertiary Hyperparathyroidism)
4. Parathyroid cancer
5. Adrenal tumors/masses (Functional or Non-functional)
6. Adrenal Carcinoma

Interests & Activities

I am the father of 2 wonderful boys and I am a devoted husband to my beautiful and intelligent wife. I am an outdoor enthusiasts and enjoy Triathlons, Marathons, Cycling, Swimming, Hiking, and basically any outdoor adventure.

All Banner facilities are pleased to provide interpretation services to our patients and their companions for no charge - just ask when you arrive.

Hospital Affiliations

Banner - University Medical Center South
Banner - University Medical Center Tucson

Expertise

Education

  • Fellowship: University of California San Francisco, 2009
  • Residency: Baylor College of Medicine, General Surgery, 2008
  • Internship: Baylor College of Medicine, General Surgery, 2004
  • Medical School: Meharry Medical College School of Medicine, 2003

Board Certifications

  • Surgery (General Surgery): American Board of Surgery, 2021

Video

Locations

  1. University of Arizona Cancer Center
    • 3838 North Campbell Avenue, Building 1, Tucson, AZ 85719
Need help scheduling? Call 520-694-2873

Testimonials

4.9 out of 5.0

670 ratings

All patient experience ratings and testimonials are submitted by actual patients and verified by a leading independent customer experience company. Patient identities are withheld to ensure confidentiality and privacy.

Search reviews
    5 out of 5 stars
    Reviewed on 12/12/2025

    A very personable doctor!

    5 out of 5 stars
    Reviewed on 12/9/2025

    He was friendly knowledgeable answered all my questions

    5 out of 5 stars
    Reviewed on 11/29/2025

    Same as previous

    5 out of 5 stars
    Reviewed on 11/24/2025

    Dr Guirrero treated me with respect and was knowledgeable and kind. He addressed all of the members of his team by name and treated them respectfully as well. He out me and my wife at ease.

    5 out of 5 stars
    Reviewed on 11/24/2025

    Excellent doc!

    5 out of 5 stars
    Reviewed on 11/18/2025

    He was very kind, thoughtful and caring. A cancer diagnosis is difficult, and he helped me feel positive.

    5 out of 5 stars
    Reviewed on 11/17/2025

    Dr Guerrero was very personable and made me feel comfortable during my visit. He spent time with me and addressed my concerns in a truly caring fashion.

    5 out of 5 stars
    Reviewed on 11/14/2025

    Dr. Guerrero is an amazing doctor, kind, smart, always friendly and explains everything about what you have going on, what to watch for, what the treatment will be if necessary. Just an all around great doctor.

    5 out of 5 stars
    Reviewed on 11/14/2025

    He was great. Friendly, clear explanations, organized layout of risks and options. To the point but understandable.

    5 out of 5 stars
    Reviewed on 11/13/2025

    Excellent presence, concerned and caring while being efficient.

    5 out of 5 stars
    Reviewed on 11/12/2025

    Kept me informed.

    5 out of 5 stars
    Reviewed on 11/11/2025

    He is very knowledgable and explains everything to you.

    5 out of 5 stars
    Reviewed on 11/10/2025

    Absolutely wonderful physician who took time to explain anything and answer any questions!

    5 out of 5 stars
    Reviewed on 11/10/2025

    They were very kind and explained everything well and didn't make me feel like a number

    5 out of 5 stars
    Reviewed on 11/10/2025

    Very nice very helpful explain things well and reassuring

    5 out of 5 stars
    Reviewed on 11/10/2025

    Very professional and adjusted to my individual needs.

    5 out of 5 stars
    Reviewed on 11/4/2025

    Dr. Guerrero fully explains to his patients what is happening with their body in post-surgery and outlines a post-surgery plan for recovery, and fully answers questions the patient has.

    5 out of 5 stars
    Reviewed on 11/4/2025

    Excellent in care and explaining what tests reveal. Very knowledgeable and takes care a step at a time.

    5 out of 5 stars
    Reviewed on 11/3/2025

    He was just very friendly, patient, willing to explain the procedure and answer questions - all around nice guy. And again, treated his medical assistants with respect, which I really liked.

    5 out of 5 stars
    Reviewed on 10/24/2025

    He is compassionate, attentive, and kind.

    5 out of 5 stars
    Reviewed on 10/20/2025

    He is very caring and has an excellent reputation

    5 out of 5 stars
    Reviewed on 10/17/2025

    Dr. Guerrero is an exceptional physician. He is very competent, caring, a good listener and takes time with his patients.

    5 out of 5 stars
    Reviewed on 10/17/2025

    He was very personable and explained the medical procedure very well.

    5 out of 5 stars
    Reviewed on 10/11/2025

    He is very experienced and knowledgeable.

    5 out of 5 stars
    Reviewed on 10/7/2025

    His caring attitude brings peace of mind and comfort to me. He's profoundly aware of sharing in terms of understanding reality conditions that relate to my medical needs.

    5 out of 5 stars
    Reviewed on 10/6/2025

    He has treated me the way I would liked to have been treated in every way. In addition, he is an excellent surgeon.

    5 out of 5 stars
    Reviewed on 10/4/2025

    He is AWESOME. Kind and explained anything we had questions about

    5 out of 5 stars
    Reviewed on 10/3/2025

    He was amazing. He explained everything quickly and concisely and even drew me a picture to illustrate. He put me at ease and made me feel so much better and I really trust him.

    5 out of 5 stars
    Reviewed on 10/3/2025

    He was patient with me as well as caring.

    5 out of 5 stars
    Reviewed on 9/26/2025

    Explained everything/very kind

    5 out of 5 stars
    Reviewed on 9/22/2025

    Dr G. takes time to explain everything. Very articulate and compassionate man. Put me at ease.

    5 out of 5 stars
    Reviewed on 9/22/2025

    Efficient and easy to discuss potential testing and scans.

    5 out of 5 stars
    Reviewed on 9/19/2025

    Very knowledgeable, took great care to be sure I understood what happening at all times

    5 out of 5 stars
    Reviewed on 9/18/2025

    He explained everything in a way that I could understand. He was very patient!

    5 out of 5 stars
    Reviewed on 9/18/2025

    Dr Guerrero is an excellent doctor and treats his patience with care.

    5 out of 5 stars
    Reviewed on 9/15/2025

    He is thorough kind and listens

    5 out of 5 stars
    Reviewed on 9/8/2025

    He has great bedside manners and cares to explain to the patient

    5 out of 5 stars
    Reviewed on 9/8/2025

    He is a gentleman and explain very good

    5 out of 5 stars
    Reviewed on 9/3/2025

    Dr. Guerrero not only demonstrated superior subject matter knowledge, he took the time to explain my particular situation to me (including using my specific radiology images). He immediately followed through with treatment. The entire time, he was pleasant and considerate (skills that are always appreciated by patients).

    5 out of 5 stars
    Reviewed on 9/1/2025

    Ever since my first appt with Dr. Guerrero I have felt comfortable and confident about my care.

    5 out of 5 stars
    Reviewed on 8/22/2025

    He was very pleasant very thorough explained everything in detail even drew pictures gave me all my options

    5 out of 5 stars
    Reviewed on 8/15/2025

    He is simply the best. He explains things thoroughly. He has a wonderful demeanor that is both serious about technical things but lighthearted in approaching his patients.

    5 out of 5 stars
    Reviewed on 8/14/2025

    Excellent communication skills. I felt very comfortable.

    5 out of 5 stars
    Reviewed on 8/10/2025

    He drew a diagram explaining how much diagnoses relates to my entire body

    5 out of 5 stars
    Reviewed on 8/8/2025

    He is the best

    5 out of 5 stars
    Reviewed on 7/21/2025

    He is personable. Very precise, but uses terms you can understand.

    5 out of 5 stars
    Reviewed on 7/14/2025

    He was polite and informative. A pleasant man.

    5 out of 5 stars
    Reviewed on 7/7/2025

    He has an outstanding reputation, wonderful pleasant personality, good experience

    5 out of 5 stars
    Reviewed on 7/7/2025

    She signed us in last visit. Very helpful, friendly, professional.

    5 out of 5 stars
    Reviewed on 7/4/2025

    Very easy to talk with and caring

    5 out of 5 stars
    Reviewed on 7/1/2025

    Very informative, pleasant, and I'm sure, knowledgeable of my problem at hand.

    5 out of 5 stars
    Reviewed on 6/27/2025

    Dr. Guerrero explained a plan for my problem in terms that I easily understood. He was kind and efficient and answered all my questions easily.

    5 out of 5 stars
    Reviewed on 6/14/2025

    He truly cares about his patients and he will explain things to you so you can understand

    5 out of 5 stars
    Reviewed on 6/13/2025

    He's the best one I have ever gone to.

    5 out of 5 stars
    Reviewed on 5/19/2025

    He is knowledgeable, an outstandingly skilled surgeon. He explained everything in easy to understand terms. He took all the time I needed to cover all my questions. I felt cared for and heard. Everyone I encountered during my surgical journey spontaneously offered praise of him and his work.

    5 out of 5 stars
    Reviewed on 5/19/2025

    It was my first surgery ever and I was made feel really comfortable and informed about the procedure.

    5 out of 5 stars
    Reviewed on 5/19/2025

    He was very knowledgeable. He took the time to explain and he explained very effectively.

    5 out of 5 stars
    Reviewed on 5/17/2025

    He was precise, he had a great sense of humor. Explained on layman terms.

    5 out of 5 stars
    Reviewed on 5/10/2025

    Dr. Guerrero is a very skilled and knowledgeable physician whom I trust with my healthcare 100%. It is great to have a doctor that you can trust and not second guess. He is also very kind with a great sense of humor.

    5 out of 5 stars
    Reviewed on 5/9/2025

    He really felt like a ray of sunshine. His confidence and positivity was just what I needed to feel like there is hope with my diagnosis.

    5 out of 5 stars
    Reviewed on 5/9/2025

    Very good doctor and knows his stuff

    5 out of 5 stars
    Reviewed on 5/5/2025

    He was very straight forward and easy to understand, listened to my questions and comments and made sure I understood the answers. He was very caring for me as a patient.

    5 out of 5 stars
    Reviewed on 4/25/2025

    He took time to explain treatment options with me after going through my tests.

    5 out of 5 stars
    Reviewed on 4/21/2025

    Dr. Guerrero is The Best surgeon in every respect. My pre op and post op meetings with him were so helpful and prepared me for the surgery and for what to expect following surgery. He is one of the kindest and most caring doctors I have ever known. When I had some swelling after surgery, I called to ask him about it. He texted me immediately and assured me that it was nothing serious, and that he wanted to put my mind at ease about it.

    5 out of 5 stars
    Reviewed on 4/21/2025

    He carefully explained what he was going to do. He explained how long it would take to get the results and the various things I could do when I got the results

    5 out of 5 stars
    Reviewed on 4/21/2025

    He carefully explained what he was going to do. He explained how long it would take to get the results and the various things I could do when I got the results

    5 out of 5 stars
    Reviewed on 4/18/2025

    Dr. Guerrero is sure that you are the most important person in the room. The explanations and descriptions are thorough and understandable. What's more his positivity is contagious.

    5 out of 5 stars
    Reviewed on 4/18/2025

    He made us feel comfortable and listened to our issues and give us every option

    5 out of 5 stars
    Reviewed on 4/17/2025

    He's been my long time Doctor and friend and I trust him with my care. I don't know how he keeps track of every detail.

    5 out of 5 stars
    Reviewed on 4/17/2025

    Listened to what I had to say. Was very personable

    5 out of 5 stars
    Reviewed on 4/17/2025

    He was competent, kind and patient

    5 out of 5 stars
    Reviewed on 4/15/2025

    Dr. Guerrero is one of the finest physicians I have ever known. He is supremely competent, expertly knowledgeable, and always has a warm and caring manner.

    5 out of 5 stars
    Reviewed on 4/12/2025

    Very Good dr / surgeon and knowledgeable and caring dr.

    5 out of 5 stars
    Reviewed on 4/11/2025

    Very professional and kind, took time to show me my CT scan in detail and gave me options and then left the decision up to me. I trust him to be there when I need him.

    5 out of 5 stars
    Reviewed on 4/8/2025

    He is excellent in taking care of me, and interacting with me

    5 out of 5 stars
    Reviewed on 4/8/2025

    Excellent Dr. Knowledgeable. Excellent patient care

    5 out of 5 stars
    Reviewed on 4/5/2025

    He is a skilled caring surgeon. He takes time to explain procedures and listen to concerns. All of his staff do the same.

    5 out of 5 stars
    Reviewed on 4/5/2025

    He is a skilled caring surgeon. He takes time to explain procedures and listen to concerns. All of his staff do the same.

    5 out of 5 stars
    Reviewed on 4/4/2025

    Friendly has excellent communication skills, explained the procedure beforehand and answered all our questions. The care he provided us is of the highest quality

    5 out of 5 stars
    Reviewed on 3/20/2025

    He's a great listener, extremely confident in his skills, honest and upbeat. I trust him .

    5 out of 5 stars
    Reviewed on 2/25/2025

    His overall bedside manner is phenomenal

    5 out of 5 stars
    Reviewed on 2/24/2025

    Excellent surgeon plus so positive and caring.

    5 out of 5 stars
    Reviewed on 2/21/2025

    Very informative and respectful. He took his time to thoroughly explain my concerns

    5 out of 5 stars
    Reviewed on 2/20/2025

    Dr Guerrero is very kind, has a great sense of humor, and communicates the findings, results of the tests and the surgery at a level that I could understand. I had great confidence in Dr. Guerrero going into surgery, and would recommend him to anyone, especially those with parathyroid issues.

    5 out of 5 stars
    Reviewed on 2/20/2025

    Dr Guerrero is very kind, has a great sense of humor, and communicates the findings, results of the tests and the surgery at a level that I could understand. I had great confidence in Dr. Guerrero going into surgery, and would recommend him to anyone, especially those with parathyroid issues.

    5 out of 5 stars
    Reviewed on 2/17/2025

    Helpful and informative

    5 out of 5 stars
    Reviewed on 2/15/2025

    Personable and explained my medical situation in easy to understand terms.

    5 out of 5 stars
    Reviewed on 2/14/2025

    Although I only met him for a brief time, Dr. Guerrero was very thorough in explaining his findings to me, for my thyroid ultrasound. He was very pleasant.

    5 out of 5 stars
    Reviewed on 2/10/2025

    Great physician. Caring and attentive to my needs.

    5 out of 5 stars
    Reviewed on 2/3/2025

    Very personable and showed a real interest in my problem by showing ne images of my thyroid and giving me next steps of what to do.

    5 out of 5 stars
    Reviewed on 2/1/2025

    Love Dr Guerrero! He is very kind, never had to wait more than a few minutes. He listens, and explains things so I can understand.

    5 out of 5 stars
    Reviewed on 1/30/2025

    He's a wonderful surgeon and amazing physician. He took time with me to explain things and make me feel comfortable with my results. That means a lot to patients, his bedside manner is probably one of the best I've seen. I used to work with physicians and he definitely is top notch .

    5 out of 5 stars
    Reviewed on 1/30/2025

    He's a wonderful surgeon and amazing physician. He took time with me to explain things and make me feel comfortable with my results. That means alot to patients, his bedside manner is probably one of the best I've seen. I used to work with physicians and he definitely is top notch .

    5 out of 5 stars
    Reviewed on 1/27/2025

    Very helpful and patient with our admin questions and admin requests

    5 out of 5 stars
    Reviewed on 1/18/2025

    Good and clear information

    5 out of 5 stars
    Reviewed on 1/17/2025

    A wonderful man and a great physician!

    5 out of 5 stars
    Reviewed on 1/16/2025

    He was kind, thoughtful, patient and informative.

    5 out of 5 stars
    Reviewed on 1/15/2025

    He is a very caring and competent doctor

    5 out of 5 stars
    Reviewed on 1/10/2025

    A top class physician. Thorough exam. Clear analysis and a great human being.

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