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Thomas M. Gallagher, DO

Endocrinology, Diabetes and Metabolism | Internal Medicine

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Expertise

Adrenal Disorders | Diabetes | Osteoporosis | Thyroid Diseases

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Specialities:

Endocrinology, Diabetes and Metabolism | Internal Medicine

Expertise

Adrenal Disorders | Diabetes | Osteoporosis | Thyroid Diseases

I am an adult endocrinologist with the St. Luke’s Center for Diabetes and Endocrinology.  I received my medical degree from the Lake Erie College of Osteopathic Medicine in Erie, PA.  I completed my residency in internal medicine at St. Luke’s University Hospital in Bethlehem, followed by a fellowship in endocrinology, diabetes, and metabolism at Penn State Hershey Medical Center. I enjoy caring for patients with a wide variety of endocrine disorders and diabetes. Helping my patients to understand and feel comfortable with their conditions, results, and treatments is the most rewarding part of my job.

I am board certified in internal medicine and endocrinology, diabetes, and metabolism.  I am a member of the Endocrine Society and American Association of Clinical Endocrinologists.  Additionally, I have published scholarly articles on barriers to genetic counseling and testing in patients with hereditary endocrinopathies as well as primary thyroid lymphoma. I have also presented posters on non-islet cell tumor hypoglycemia and Kennedy’s Disease and its associated endocrine abnormalities.

I joined the St. Luke’s Center for Diabetes and Endocrinology in 2017 where I enjoy treating patients with diabetes as well as a wide range of endocrine diseases.

 

 

school Education

Medical School
  • Lake Erie College of Osteopathic Medicine, 2012
Residency
  • St. Luke's Hospital and Health Network, 2012 - 2015
Fellowship
  • Penn State Milton S Hershey Medical Center, 2015 - 2017
Board Certifications
  • Endocrinology, Diabetes and Metabolism

star Reviews 4.9 Overall Rating | 216 Ratings | 79 Reviews

4.9 Overall Rating | 216 Ratings | 79 Reviews

The Patient Satisfaction Rating is an average of all responses to the care provider related questions from our nationally recognized Press Ganey Patient Satisfaction Survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

Responses are measured on a scale of 1 to 5 with 5 being the best score.

The comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of St. Luke's University Health Network.

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5.0 RATING

“Dr Gallagher excellent doctor and person”


July 20, 2025
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5.0 RATING

“Dr Gallagher is very good listener and is great with addressing my concerns”


July 5, 2025
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5.0 RATING

“Excellent Doctor THOMAS MICHAEL GALLAGHER, D.O. and staff in this office”


July 5, 2025
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4.4 RATING

“Dr Gallagher is very helpful in coming up with answers to get pointed to the correct providers.”


July 1, 2025
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5.0 RATING

“Dr Gallagher and his associate Dr Zavaria are phenomenal providers. Dr Z explained things in a very concise manner and at my level. She was terrific. The two of them are both 5-Star providers!”


June 22, 2025
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5.0 RATING

“Dr Gallagher is very professional and takes the time to listen and work with me for the best possible solution to my health issue.”


June 20, 2025
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5.0 RATING

“YThis would be my last visit with Dr. Gallagher because I'm moving out of town. Dr. Gallagher was able to get an appointment for me with him even though he was booked fully. He has been the best doctor in this Endocrinology group that I have had contact with in the 5+ years I've been seeing this group. I would recommend Dr. Gallagher highly to anyone who needs endocrinology services.”


June 16, 2025
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5.0 RATING

“Excellent doctor. I felt very comfortable with him. Very personable”


June 9, 2025
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5.0 RATING

“Always a pleasure.”


June 9, 2025
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5.0 RATING

“Dr. Gallagher is great!”


June 9, 2025
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5.0 RATING

“The Dr I see is always kind and helpful . He always answers any questions I may have and he always makes me feel comfortable. I would highly recommend him to my friends and family.”


June 8, 2025
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5.0 RATING

“Dr,Gallagher is very thorough and cares about his patients. Always a great visit with him. Explains things well.”


June 7, 2025
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5.0 RATING

“Terrific experience with both the endocrine fellow and Dr Gallagher. Both were patient centered, knowledgeable and personable. Would definitely recommend.”


May 17, 2025
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5.0 RATING

“Is always an informative visit!”


May 11, 2025
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5.0 RATING

“Everything went well as always”


May 9, 2025
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4.9 RATING

“Visit was fine”


May 5, 2025
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4.9 RATING

“I received both an email and text, asking me to respond to the message when I arrived. I did so, and the message that was returned to me read: "thank you, you are now checked in". Therefore, I assumed that I was indeed checked in. Apparently when you receive that message, you still need to check in at the desk. Fortunately, one of the receptionists noticed me sitting in the waiting room and completed the check in process. Your messaging is very confusing, but should be easy to fix.”


April 24, 2025
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5.0 RATING

“Dr. Gallagher was so informative about my medical condition that he put me at ease and feeling like I finally found the right doctor to help me to get my life back to normal again. He's really good so give him all the support that you can to keep him in your medical group.”


April 20, 2025
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5.0 RATING

“I like Dr. Gallagher and that he answers any questions I think to ask, even as the appt is ending.... When you always think of a question you meant to ask! But, he also is quick to respond if anything is off with blood work or there is any other issue. My 2 St. Luke docs are great. Keep offices in Bucks so my insurance allows me to keep going to them ! (Its big issue, big deal to lose a good doc)”


April 13, 2025
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5.0 RATING

“Dr Gallagher is very caring, knowledgeable and professional.The CNA who got me ready for my appointment was thorough and conscientious.”


April 12, 2025
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4.9 RATING

“This was my first visit so some questions may not apply.”


April 11, 2025
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5.0 RATING

“Very informative”


April 8, 2025
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5.0 RATING

“Dr. Gallagher is always well prepared for an appointment and is very knowledgeable and friendly. I have sent a number of messages through the portal and he is always very responsive. He is one of my favorite doctors.”


April 5, 2025
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5.0 RATING

“All were very professional”


April 2, 2025
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5.0 RATING

“Dr. Gallagher Is the best. Very knowledgeable and caring.”


April 2, 2025
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5.0 RATING

“This office is both professional and personal at the same time. I always feel welcome here, almost like a family friend, but at the same time can discuss issues with my health and not feel like they are being brushed off, that means a lot to a patient, so thank you all for that!”


March 31, 2025
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5.0 RATING

“This was my first visit with Dr. Gallagher. I switched from another provider. I wish I could give him a score higher than 10. He was understanding, extremely knowledgeable, and supportive. He listened. There was a problem with my email address...which was spelled "verison" not Verizon...and the front office person fixed it quickly. Nurse was also pleasant and waiting room was not a zoo”


March 30, 2025
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5.0 RATING

“I am very pleased with the people and the care that I received during this office visit. Especially the doctor was very aaccommodating!”


March 29, 2025
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5.0 RATING

“Yhe physician O saw is from the group with my PCP. Allthe physicians in that group are excellent. My PCP is great. The physician I saw for this visit was clear , kind , comprehensive and concise.”


March 29, 2025
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5.0 RATING

“I appreciate that Dr Gallagher was able to show me how to administer a shot to myself for the first time and to answer questions I had about using and traveling with this medication.”


March 18, 2025
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5.0 RATING

“All Good.”


March 18, 2025
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5.0 RATING

“Dr Gallagher is wonderful.”


March 15, 2025
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5.0 RATING

“I do appreciate Dr. Gallagher's help with my condition over the years as well as his prompt responses when I have a question through the app.”


March 15, 2025
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5.0 RATING

“I had concerns about taking munjarno shots doctor helped me with discition and learnd some things to bad I cant spell well”


March 15, 2025
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5.0 RATING

“Overall this Dr THOMAS MICHAEL GALLAGHER, D.O. group is excellent”


March 8, 2025
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5.0 RATING

“Everyone was friendly and courteous”


March 4, 2025
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5.0 RATING

“Doctors were very experienced In Diabetes. Sent a lot s time with me thought they were very thorough”


March 1, 2025
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5.0 RATING

“Dr Gallagher is the epitome of what a doctor should be. He is off the charts knowledgeable, listens intently to my concerns and always shows me care and concern with a sincere demeanor. My partner and I travel very far to see dr Gallagher and I would never change doctors. I feel blessed and honored to be his patient as well as safe in his care.”


February 28, 2025
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5.0 RATING

“I really appreciate Dr. Gallagher and his office. They are always courteous, timely and knowledgeable. Dr. Gallagher interacts with me very respectfully. He listens to my concerns and respectfully considers my opinion when medical decisions need to be made. I would highly recommend this office and doctor to others.”


February 12, 2025
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5.0 RATING

“Dr Gallagher is a great Doc1”


February 9, 2025
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5.0 RATING

“All good with visit to THOMAS MICHAEL GALLAGHER, D.O.”


January 31, 2025
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4.9 RATING

“Dr. Gallagher seemed very pleasant and thorough. Now I hope he can just find the route to my problem.”


January 26, 2025
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5.0 RATING

“Dr. Gallagher clearly explained all treatment options for my condition, pros and cons, and side effects.”


January 25, 2025
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5.0 RATING

“Dr. Gallagher listens attentively, interacts with my other specialists, always has a clear, working understanding of the latest events in my medical history, and then ties it all together. I am very grateful to him.”


January 25, 2025
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5.0 RATING

“Dr. Gallagher is excellent. He reviews my records before entering the exam room. He is extremely knowledgeable. I've recommended my friend to him recently.”


January 18, 2025
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5.0 RATING

“This was an exploratory visit with THOMAS MICHAEL GALLAGHER, D.O. based on recommendations by my primary care physician or in the process of going through the steps to address this particular medical issue”


January 16, 2025
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5.0 RATING

“Dr. Thomas Gallagher is an excellent physician and I would recommend him to anyone looking for an endocrinologist!”


January 16, 2025
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5.0 RATING

“Dr Gallagher is an excellent endocrinologist. He explains what it means to have a thyroid condition and helps us understand and decide on what medications and tests to have. We feel confident that he makes the correct decisions for our treatment. He is kind, respectful, thorough and very intelligent.”


January 10, 2025
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5.0 RATING

“Great experience. Everyone was very helpful, friendly and respectful.”


January 10, 2025
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5.0 RATING

“I have had issues with my thyroid and the first doctor (Name) I saw was rude and very not personable. I was given Dr. Gallagher's name from a friend and she was right. He is a very good listener, validated my concerns, took a holistic approach and ordered tests for other things that made complete sense. He was spot on! There is more going on with me than just my thyroid. I am looking forward to working with him to come up with a treatment plan.”


January 10, 2025
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5.0 RATING

“Dr. GALLAGHER IS AN AMAZING DOCTOR AND HE GENUINELY CARES ABOUT ME.”


January 9, 2025
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5.0 RATING

“I was a new patient.I prefer to see Dr. Gallagher. Do not want to see the Fellows.Dr. Gallagher is a very nice, respectful, knowledgeable Doctor.”


January 4, 2025
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5.0 RATING

“Great team at Center valley Endocrinology office.It is pleasure to have Dr Thomas Gallagher as my provider.”


December 30, 2024
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5.0 RATING

“Doctor Gallagher is both thorough and caring. He makes you feel like you're the only patient. He is highly educated, but never makes you feel as though you can't ask a question and his explanations are in laymen's terms. You've got a true gem there!”


December 27, 2024
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5.0 RATING

“Dr, Gallagher is a thorough, respectful, courteous and caring doctor. I'm very happy he is providing my routine exam.”


December 16, 2024
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5.0 RATING

“The doctor THOMAS MICHAEL GALLAGHER, D.O. and staff here are great”


December 15, 2024
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5.0 RATING

“Dr Gallagher is very kid, compassionate and listened carefully. He discovered a very rare genetic condition I have. He is one of the best, most thorough doctors I have ever seen”


December 14, 2024
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5.0 RATING

“This visit was a consultation and an initial visit to discuss medication events. Going forward I would not hesitate to call this provider THOMAS MICHAEL GALLAGHER, D.O., however only if conditions worsen.”


December 12, 2024
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5.0 RATING

“This office is very professional. Dr Gallagher is a terrific doctor.”


December 12, 2024
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5.0 RATING

“Dr Gallagher and staff are excellent !!”


December 12, 2024
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5.0 RATING

“Dr. Gallagher had someone shadowing him, I forget her name, but she was phenomenal and I would be more than happy to have her on my medical care team. She was nice, thorough, easy to talk, and listened to what I had to say. Both her and Dr. Gallagher were great!”


December 9, 2024
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5.0 RATING

“THOMAS MICHAEL GALLAGHER, D.O. is My favorite physician I see within st Luke's. He's such a positive part of my care.”


November 17, 2024
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5.0 RATING

“Dr Gallagher is a great physician!”


November 16, 2024
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5.0 RATING

“Dr. Gallagher is wonderful. He listens, he is extremely responsive with regard to online communication and I feel very comfortable seeing him as my endocrinologist.”


November 15, 2024
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5.0 RATING

“I always have a good experience with this office of THOMAS MICHAEL GALLAGHER, D.O whether in person or on the phone. They are cheerful, helpful and polite.”


November 8, 2024
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5.0 RATING

“After seeing multiple endocrinologists about multiple endocrine issues, this was the first time a doctor could look at the whole picture. I was ready to give up on endo's completely. I'm used to being told "we can only talk about one condition". This was the first endo that spent quality time and actually seemed to genuinely care about me.”


November 4, 2024
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5.0 RATING

“I always have a good experience with Dr. Gallagher and his staff.”


October 28, 2024
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5.0 RATING

“Everyone were polite and helpful at the office of THOMAS MICHAEL GALLAGHER, D.O.”


October 27, 2024
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5.0 RATING

“Dr. Gallagher is a first rate endocrinologist. I have been seeing him for about 6 years. He is empathetic as well as extremely professional. He saw me through some rough times and seems as pleased about my continuing good health as I am. He almost seems like a friend. His staff is very efficient and friendly, too.”


October 23, 2024
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5.0 RATING

“I drive a distance to see Dr. Gallagher. At this visit I had 3 questions related to my diagnosis, all of which where answered.He is extremely knowledgeable In his specialized field. He also has a kind manner about him. I always leave the office feelingContent that he Is overseeing my Medical Care.”


October 22, 2024
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5.0 RATING

“Dr Gallagher took time to explain the course of action he planned on taking with my diabetes. He answered questions I had and filled me in with my care. He took time to listen not just give me information.”


October 21, 2024
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5.0 RATING

“Dr Gallagher is the best! If I could give him over a 10 I would. He's so helpful and respectful. He always knows my medical history and he's absolutely the best getting back to me in a timely manner. Absolutely love him at my provider I wouldn't go to anyone else.”


October 21, 2024
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5.0 RATING

“Dr. Gallagher is the consummate doctor; he is extremely competent in his field and ALWAYS shows deep respect and concern for my health issues.”


October 15, 2024
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5.0 RATING

“Good visit with THOMAS MICHAEL GALLAGHER, D.O.”


October 13, 2024
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5.0 RATING

“I appreciate Dr Gallagher's life style changes options instead of prescribing a medication right away. I also appreciate the suggestion of a repeat blood test in a few months rather than jumping to conclusions because of 1 out lying result. Always explaining clearly.”


October 12, 2024
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5.0 RATING

“Everyone treated me with respect and care. They sent me for bloodwork, but I am scheduled for that on 10/09/2024 plus an ultrasound. They were very thorough with getting my history since I am a new patient. I would highly recommend THOMAS MICHAEL GALLAGHER, D.O. to anyone.”


October 1, 2024
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5.0 RATING

“Doctor THOMAS MICHAEL GALLAGHER, D.O is wonderful especially his coworker and all the staff are amazing Thank you for making us feel comfortable.”


September 23, 2024
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5.0 RATING

“The question about the office calling to discuss labs, I usually see them on the portal and the message back and forth about next steps .”


September 18, 2024
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5.0 RATING

“Everything was excellent with THOMAS MICHAEL GALLAGHER, D.O.”


September 18, 2024

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