Jenna S. Mammen, MD, PhD
Endocrinology
Johns Hopkins Bayview Medical Center
4940 Eastern Avenue, BMO Building
Baltimore, MD 21224 Directions
4.9 out of 5
123 verified ratings
123 Ratings, 39 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.
Jun 22, 2026
Perfect!
May 28, 2026
Dr. Mammen is extremely professional, knowledgeable and upbeat. She reviews your health concerns and provides advice on current and future treatment methods.
Apr 23, 2026
My provider has done a great job keeping my Graves disease under control.
Apr 16, 2026
Dr Mammen is wonderful.
Apr 13, 2026
Great doctor
Apr 9, 2026
Explained the exam well and provided for follow up
Apr 9, 2026
Knowledgeable, good listener, good advisor
Mar 23, 2026
She is very good at explaining things and has an excellent bedside manner.
Mar 9, 2026
Dr Mammen is an excellent doctor, very thorough, caring and concerned.
Mar 9, 2026
Good
Feb 19, 2026
Dr Mammen
Feb 12, 2026
Was excelent
Feb 12, 2026
She is excellent takes time to explain things and Dr. MAMMEN gives fast response on my chart. She is so smart and kind.
Feb 2, 2026
Dr Mammen is a great specialist:kind, knowlegeable
Feb 2, 2026
Warm, caring, extremely knowledgeable
Jan 29, 2026
Video visit not as thorough
Jan 29, 2026
She is very good good
Jan 15, 2026
5 stars all day every visit
Jan 12, 2026
Professional and explained very clearly
Jan 8, 2026
The resident, [staff] was very thorough, considerate, and engaged. [staff] conducted a very detailed medication reconciliation process and asked relevant questions. Dr. Mammen was efficient, respectful, a great listener and provided me with the most evidence-based treatment considerations so that I can be well prepared for our next visit. I could not be more pleased and I know that I am in very competent hands.
Dec 22, 2025
Knowledgeable, intelligent, easy to understand
Dec 18, 2025
Excellent
Dec 8, 2025
The Dr. Mammen was very knowledgeable and reviewed associated tests from other provider and connected the dots for me.
Dec 4, 2025
Excellent physician
Dec 4, 2025
Thoughtful, warm, attentive, knowledgeable
Nov 24, 2025
Dr Mammen is considerate and never rush on medications unless necessary. This is one thing I admire about her that she makes sure to inform the need of medication and would listen to the patient's concerns. She alsoProvides prompt response on any health related query over the patient portal
Nov 20, 2025
Dr. Mammem is the finest physician I have, as well, an equally fine person.
Nov 20, 2025
Microphone on my pc was faulty so provider called me and we continued with phone and pc together-so she is very resourceful.
Nov 13, 2025
Dr. Mammen has provided excellent care. She was reassuring in my treatment and worked with me to create a plan for management. Very knowledgeable and professional.
Nov 5, 2025
Dr mammen is the best. She gets my thyroid numbers correct all the time and explains what meds Interfere with thyroid meds. Very knowegeable
Oct 15, 2025
Very nice
Oct 15, 2025
Provider was very thorough and gave excellent advice
Oct 13, 2025
I do not feel that the provider explains thyroid health conditions very well to the patient.
Oct 9, 2025
Dr Mammen is the best for my problem. She got me off a medicine which I had taken for years. She has knowledge of the latest research in her field of medicine.
Sep 17, 2025
Dr. Mammen knows her field well and communicates clearly about all of her OWN concerns for a patient and their personal concerns and questions as well. She is a real credit to JHH.
Sep 17, 2025
Very professional and trustworthy.
Sep 16, 2025
Dr Mammen is excellent. It is hard to get an appointment without 3-4 month wait
Sep 16, 2025
Dr. Mammen is always punctual for my appointments. She is very thorough and does a great job answering my questions and explaining information.
Sep 15, 2025
Provider listened, responded with candor and was clear about next steps.