Mark C. Markowski, MD, PhD
Medical Oncology
Sibley Memorial Hospital
5255 Loughboro Road NW
Washington, DC 20016 Directions
5.0 out of 5
256 verified ratings
256 Ratings, 83 Comments
The following ratings and reviews are based on verified feedback collected from independently administered patient experience surveys. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy.
Jul 9, 2026
Dr. Markowski is an absolutely fantastic doctor; thorough, patient, attentive and obviously displays the highest level of expertise in his field.
Jul 7, 2026
My physician is the best.
Jun 23, 2026
Dr. Markowski is outstanding! Lucky to have him as my oncologist
Jun 23, 2026
I love being able to use the video appointment schedule due to my declining health
Jun 18, 2026
My visit with the primary provider was excellent
Jun 9, 2026
Punctual, professional,prepared,offered options,likeable
Jun 4, 2026
This was my first consultation with Dr. Markowski. He listened to me, and took care of an issue I was having with another provider on the spot. He provided reassuring perspective on my condition. As my medical oncologist, I believe he will be a solid nexus for oversight and any questions I may have regarding my care over the next couple of years.
Jun 2, 2026
Professional, good humored, good memory of my issues with little need of notes, but with a thorough review of records of my current health status.
May 26, 2026
Always a positive experience. Dr. Markowski is a kind and exceptionally caring physician
May 26, 2026
He is great. He listens and and I truthfully his advice
May 21, 2026
Dr. Markowski is a great asset to your organization. I've been with him for 6 years and his guidance & knowledge has kept my cancer in control! Great guy!!!!
May 14, 2026
Great doctor, awesome advice, thanks!
May 7, 2026
Very good
May 7, 2026
Open, honest, straightforward. Knowledgeable and professional.
May 5, 2026
Highly professional and courteous service.
May 5, 2026
Keep the good work
Apr 28, 2026
The very best
Apr 23, 2026
Very positive about current condition of health and what is needed to see continued improvement. Stressed physical appearance improvement over previous visit. Dr. Markowski has a very comfortable manner that is laced with information regarding the condition and course of treatment. Ensures the patient understands him.
Apr 23, 2026
Dr. Markowski is outstanding. He is taking excellent care of me, and I appreciate all that he is doing.
Apr 16, 2026
Always feel comfortable, and confident with his advise and care
Apr 16, 2026
Outstanding
Apr 14, 2026
All good
Apr 14, 2026
Provides the very best care
Apr 14, 2026
I love my doctor! I travel 60 mins to only visit with him
Mar 31, 2026
I Was Treated With the Best Professionalism, Kindness, Compassion, from the Point I Valiaied my car, to walking thru Security
Mar 31, 2026
Dr. Markowski is excellent.
Mar 26, 2026
He is a rock star. Very professional!
Mar 18, 2026
Dr. Markowski was polite and professional
Mar 17, 2026
Dr. Markowski always goes out of his way to make sure his patients are completely versed on their medical tests. He has a tremendous bedside manner.
Mar 17, 2026
Very positive approach to expectations. In this case the Pluvicto treatment side effects have continued and resulted in weight loss. Dr. Markowski was very concerned with the amount of weight loss and discussed at length the possible options.
Mar 17, 2026
Dr. Markowski is great and gives me confidence. He is very friendly, respectful, and has a very pleasant sense of humor. I feel very lucky that he is my oncologist.
Mar 10, 2026
Excellent, thoughtful responses to my questions and requests for any further questions I might have.
Mar 10, 2026
Outstanding
Mar 3, 2026
Dr. Markowski is an excellent physician with helpful insight into my treatment plan.
Feb 24, 2026
Would recommend
Feb 24, 2026
Wonderful!
Feb 19, 2026
Best doctor I know
Feb 17, 2026
Caring. Precise. Gives me confidence as I work through my cancer.
Feb 12, 2026
Dr. Markowski always makes me feel better and has solutions which make sense.
Feb 12, 2026
Dr. Markowski was excellent. He listened to my concerns and guided me on treatment for my cancer.
Feb 3, 2026
This was my initial visit with the provider. My medical history and especially recent CT scans, biopsy of a renal mass, proton radiation of the renal mass, biopsy of lung nodule had all been studied and carefully evaluated before my consultation.
Feb 3, 2026
Dr Markowski is great. Energetic, informed, open to ideas, cooperative, collaborative.
Jan 29, 2026
Dr. M is the best
Jan 27, 2026
Dr. Markowski is the perfect Dr. For me and my situation
Jan 22, 2026
One word excellent
Jan 22, 2026
Great visit
Jan 22, 2026
Dr. Mark is very thorough and has always pointed me in the right direction.
Jan 22, 2026
Always highly pleased
Jan 20, 2026
Always knows going on and gives me good direction.
Jan 20, 2026
Dr. Markowski if fantastic he is always energetic and considerate.