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Marcus Messmer, MD

Internal Medicine Physician - Medical Oncology

Biography

A cancer diagnosis can be an overwhelming and life-altering event. I am honored to have the privilege of guiding patients and their families through each step of their care. The rapid pace of oncology… Read more ›

Featured Review See More Reviews

The nurses and doctor listen to all my concerns…

Anonymous

Summary

Provider Training

UniversityDegreeFocusGraduated
Johns Hopkins University School of MedicineDoctorateOther2014

InstitutionFocusYear
Fellowship - Johns Hopkins HospitalOther2021
Internship - Johns Hopkins HospitalOther2015
Residency - Johns Hopkins HospitalOther2017

Specialties

Languages Spoken
English
Medical Specialties
  • Internal Medicine Physician - Sub-Specialty: Medical Oncology

Accepts New Patients: Yes

Payment Options

Payment Details

Reviews

Average Rating: 5
Number of Reviews: 4
Most Recent Review: 01/14/2026
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Office & Staff Evaluation Not rated

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Office Appearance & Atmosphere Not rated
Handling of Billing Matters Not rated
Average Wait Time Not Rated

Provider Evaluation

Listening Skills
Clear Explanations
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Verified Patient

“The nurses and doctor listen to ...”

The nurses and doctor listen to all my concerns

Anonymous 01/14/2026
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Verified Patient

“Very satisfied, with PEACE OF MI...”

Very satisfied, with PEACE OF MIND.

Anonymous 08/07/2025
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Verified Patient

“WE WERE COMING FOR A SECOND OPIN...”

WE WERE COMING FOR A SECOND OPINION DEALING WITH THE CURRENT ISSUES AT HAND. TALKING WITH DR. MESSMER WAS WONDERFUL. IT RELIEVED AND CONFIRM THE TREATMENT THAT WE WERE CURRENTLY DEALING WITH. VERY THANKFUL FOR OUR TALK WITH HIM!!!!!

Anonymous 01/02/2026
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Verified Patient

“Dr. Messmer was excellent. Did n...”

Dr. Messmer was excellent. Did not feel rushed.

Anonymous 08/03/2025

Locations

Affiliated Practices

Practice Colleagues

Hossein Borghaei, DO, MS   -   Internal Medicine Physician
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Christopher Manley, MD   -   Internal Medicine Physician
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Eric Horwitz, MD, FABS, FASTRO   -   Radiation Oncologist
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Michael Hall, MD, MS, FASCO   -   Internal Medicine Physician
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Scot Ebbinghaus, MD   -   Internal Medicine Physician
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Matthew Zibelman, MD   -   Internal Medicine Physician
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Hannah Campbell, SCM, LCGC   -   Medical Geneticist/Genomicist
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Procedures & Services

Procedures & Treatments Offered

    Commonly Prescribed Medications

    Marcus Messmer, MD has not yet listed the medications that he commonly prescribes.

    Accepted Insurance

    Accepted Insurance

    Marcus Messmer, MD has not yet specified the insurance plans he accepts.
     

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