Stephanie Mergenthaler

Stephanie Mergenthaler, DNP, FNP-BC, FNP-C

Patient Rating
4.6 out of 5 (342 Ratings, 95 Comments)

Profile

Gender:
Female

Specialty:

Express Care

Areas of Interest

Stephanie Mergenthaler, DNP, FNP-BC, FNP-C, is a family nurse practitioner who treats patients at MaineGeneral Express Care's clinic locations. A member of MaineGeneral Medical Center's Professional Services Staff since July 2021, she previously worked as a medical surgical telemetry registered nurse and relief charge nurse at the Alfond Center for Health while completing her graduate degree program.

Languages Spoken

  • English

Education

Education

2012
Mount Wachusett Community College, Gardner, MA, Associates, Nursing
2016
Kaplan University, Augusta, ME, Bachelor's, Nursing
2021
Purdue University Global, Augusta, ME, Master's, Nursing (Family Nurse Practitioner Program)
2022
Purdue University Global, Doctorate of Nursing Practice

Professional Memberships

  • American Academy of Nurse Practitioners

Board Certifications

  • American Association of Nurse Practitioners, Family Nurse Practitioner
  • American Nurses Credentialing Center, Family Nurse Practitioner

Office Information

Locations

Patient Reviews

June 30, 2026
Very respectful and informative
June 22, 2026
Everyone was very polite, professional and I felt heard not just another patient to be seen that day
June 20, 2026
staff very nice.
June 20, 2026
I had a follow up visit. I needed X-rays. I was given printed out directions as I am just visiting. All good results. Thank You very much to the entire team and the people at Maine General - Thayer ?
June 20, 2026
NP Stephanie was pleasant and personable and very helpful with my presenting complaint. I appreciate all she did to help.
June 19, 2026
When results of my lab work came back, they called to let me know that I did not have an infection and that I could stop taking my antibiotics or I could continue taking them if they were helping my symptoms.
June 19, 2026
They followed up And I now have an appointment With primary care
June 19, 2026
Very pleasant experience with helpful staff and nice environment. Very professional and knowledgeable and would highly recommend
June 18, 2026
I have been sick for almost 3 weeks. Went to the ER prior to express care with difficulty breathing and sat waiting for 2 hours just to get in a room, nevermind being seen. Express care had me in triage and to a room within 15 minutes of arrival. Not only did the provider do a thorough assessment, but she also listened to me which was huge. Sometimes healthcare staff forget the patients they treat are people to and not just a number or another $ sign. Major kudos to Stephanie for providing excellent care and listening and while there was not a definitive answer to my health, knowing I was being listened to was huge.
June 05, 2026
Everybody was helpful from start to finish. I was in and out quicker than I thought. And in terms of the actual treatment I received, I thought it was professional and courteous and the provider was able to help remedy the situation quickly and I was out and better in no time. So really grateful for the whole experience being quick and getting the job done and the follow-up and everything. So thanks so much. Keep up the good work.
June 05, 2026
Registration staff wasn't very friendly, i felt like everyone could hear my personal information because she was saying it so loudly. The nurse and NP were very nice and got me in and out of there quickly!
May 30, 2026
Yes, I was especially grateful that my caregiver assured me that it was not irresponsible of me to come in for a visit, even though what I thought I was coming in for turned out not to be the case. But even so, it was very reassuring that I was told I hadn't wasted anybody's time by making the choice to come in. I found the care really helpful, and I left knowing exactly what to do, and I thank you all for the care.
May 30, 2026
Hi, I believe I was really, really surprised that they thought I was really sick. I thought they were just going to send me home. So I would say I had a very good experience and thank you. Bye.
May 25, 2026
This experience was 1000x better than the experience I had Friday at Concentra. This was a work injury and Concentra berated me and did not listen or do any type of actual exam on me. I felt as if they stereotyped me based on my looks and decided that I was not hurt without even touching my arm. My experience at Express Care on Monday was the total opposite, I felt like I was taken seriously and they actually did an exam and imaging and found I was indeed injured, severely and put a rush on my x-rays because they were worried of deeper damage. I only wish I had gone there 1st.
May 25, 2026
Excellent care, very pleased.
May 25, 2026
I had a great experience. Everyone one there made my experience very enjoyable with it being an unenjoyable reason for having to be there.
May 25, 2026
Stephanie Merganthaler was amazing as was the MA (Alex?) and the psr. Top notch in every way!!
May 22, 2026
The Medical staff was fantastic.
May 22, 2026
I had Stephanie NP for a provider. What an absolute dream she is. Very thorough and on top of the problem. What a breath of fresh air to have a provider with a sense of humor and also displaying her caring nature.
May 22, 2026
Very friendly and professional!!
May 19, 2026
very fast, very nice people gentle people, did a great job.
May 15, 2026
Great staff
May 14, 2026
She was very, very nice, explained everything, and she was training another girl, and she just kept her involved on everything, and I think she did a fantastic job.
May 07, 2026
I went in for elbow pain. I was in seem for less than 10 minutes and told I had tennis elbow. Waste of $25. I am still having the same issues and using the compression as suggested with no relief.
May 03, 2026
Super positive experience with Stephanie.
April 29, 2026
The provider that took care of my tick bite did a very good job. She was very knowledgeable. She helped me feel at ease and she took care of me. Greatly appreciated. Thank you.
April 29, 2026
Team were very caring and kind. Thank you!
April 27, 2026
They examined me for a tick bite and ordered medication that I picked up for treatment that has helped very much.
April 24, 2026
Everyone was kind, knowledgeable and helpful. The treatment that was prescribed it's working, and I'm starting to feel better.
April 21, 2026
Great staff, very nice people
April 16, 2026
I could not use the ointment and antibiotic pills but I got them, and will make sure I can take them. I will call my PCP on Monday to be sure. I am glad you are there for this type of medical kind of service. Thank you.
March 19, 2026
All staff were excellent and great to have attend to me
March 16, 2026
They all were spectacular. This was what I actually needed Done & the wellness check is just "talk". Express Care covered all the issues. Thank you.
March 13, 2026
Reception staff and treatment staff were all very understanding, personal, and professional in identifying my issue and recommending further treatment. Very pleasant experience which led to successful treatment.
March 12, 2026
I thought the doctor was very thorough and did a great job and explained everything very well. And we did a bunch of tests, which last time I was there, that didn't happen. And I was really impressed with her and everything else. Thank you. Bye.
March 09, 2026
Everyone that I encountered was very reassuring, calming, personable, and listened to me carefully. I felt very at ease and felt that I was being taken seriously.
March 03, 2026
Very very very long wait
February 28, 2026
Found the caregiver nurse to.be very professional and great personality and very helpful
February 20, 2026
The regular office messed up my appt so I went to express care, so naturally I couldn't get a referral that I wanted or a MRI as I have a pinched nerve so I'm doing it on my own. I also think it's sad that you can't see a "real" doctor just nurses
February 16, 2026
I saw Dr Stephanie Mergenthaler. She was caring and understanding. She was professional and listened to me. The MA on duty was very professional. I also saw a student who was also very understanding.
February 16, 2026
This is my second time coming here and both times it was quick and informative. Everyone was super friendly and helpful
February 15, 2026
Your provider treated you with respect and she was very knowledgeable and she was very nice.
February 08, 2026
Everyone I interacted with was kind, caring, polite and so nice. I had a MUCH better experience at Express Care than Convenient MD. Thank you!
February 08, 2026
Every single person I dealt with was very nice and pleasant and made me feel very comfortable.
February 05, 2026
Staff was great! I appreciate all their help!
January 23, 2026
I couldn't have appreciated the care that we got any more.
January 23, 2026
Thanks for all the help you did for me and for other people would say the same
January 17, 2026
The staff was excellent and so was Stephanie. It was quick and easy and everybody was professional and courteous and provided excellent information. Thank you.
January 15, 2026
Staff were excellent. They listened to my concerns. They gave me feedback. They did not appear pressed for time. Like typical offices, you got 15 minutes to see the patient. They took the time necessary to care for me and I appreciate it. It was great.
January 12, 2026
Great service and concern for the well being of patients.
January 12, 2026
Let patients know that express care and Dr office is separate from each other
January 06, 2026
Everybody was very friendly. The nurse was very attentive and they got us in and out very quickly.
January 02, 2026
Everyone were pleasant and I got the results I expected!
December 31, 2025
The all-around experience was excellent. The staff there was excellent. The service provider was excellent. I can't say enough about it. Thank you.
December 31, 2025
very quick & through.
December 31, 2025
I specifically came in and said I was looking to be tested for the flu because I had just started experiencing symptoms (was hoping for Tamiflu while in the window)and wasn't informed before being seen that there was no tests available. I would have just left had I known I wasn't getting what I came for.
December 30, 2025
Staff were excellent! My concerns were heard and addressed in a very timely manner - especially since it was quite busy.
December 30, 2025
Everyone was very nice and it was quicker than I expected.
December 21, 2025
Top notch
December 20, 2025
Excellent Service Provider.
December 20, 2025
The facility was clean and the staff was wonderful.
December 18, 2025
The nurse was amazing, very knowledgeable and personable. The doctor as well. I felt as though I received the care I would have received from my pcp. Love the availability for X-rays on site and not having to go to the er to get scans. Very thorough care.
December 16, 2025
Pleasant team all around. Made me feel at ease.
December 05, 2025
Everyone was professional and helpful. They treated me with dignity and understanding.
December 05, 2025
Always a great experience with all of the staff at Gardiner Express Care. Matter of fact, it is the only one I will go to.
November 24, 2025
I was extremely impressed with everything from the moment I walked up to reception to leaving the facility. Super experience!
November 15, 2025
Stephanie was thorough, attentive, and very willing to answer all of my questions. I trusted her and trusted her recommendations. It was a very good experience and I will not hesitate to return to the MG Express Care should I have a need in the future.
November 15, 2025
Stephanie M. listened, explained and documented very well.
November 14, 2025
Thank you
November 14, 2025
Horrible experience saw dr fot 5 mins 4 hours later they could bot locate i walked out they never called or followed up. Glad I didnot die while there.
November 10, 2025
Nice folks who came up with a clear plan for resolving my health issue.
November 10, 2025
Wait time less than 10 minutes, Stephanie was good listener and quickly decided a plan of action, felt confident with her expertise
November 02, 2025
I was treated very well. I appreciated the staff from the two people who saw me. And I just can't think of anything that they could do better at. And I'm just very glad that they're in the city and available.
October 19, 2025
Thank you great care Front desk..... Stephanie and nurse very kind professional great sense of humor
October 17, 2025
Everyone was very professional and helpful!
October 13, 2025
The staff was helpful and kind.
October 12, 2025
I only had a half hour to catch a bus and the staff really worked to get me through treatment and on time.
October 06, 2025
It seems now 48 hours, I guess, after my visit, my lab work still hasn't shown up in Follow My Health. I understood that the Follow My Health portal was a trans facility, trans provider window into all kinds of information. And as I said, I haven't seen anything from this visit show up. in the portal yet. Thank you.
October 02, 2025
Not in relation to express care which they did their job wonderfully, the walk in clinic for orthopedics should specify on the website a acute injury within past 30 days to be seen.
September 24, 2025
What a great group of people! From check-in to leaving, the staff was excellent! I have never had a bad experience when I have had to go!
September 24, 2025
Check in was great. Despite systems being down the process was very efficient. The wait was short compared to most urgent care options. The provider listened well to my concerns and addressed them with empathy and compassion. When giving instructions to do a self swab, things went south. The provider said I needed to "make sure I get it in the right hole." Which made me nervous. Then told me to leave the samples on the counter and I could go home. After completing the swab, something seemed off and I wanted to ask a few questions. I waited a bit and when I looked in the hall, no one was in sight. So I left. Upon returning home, I had some pain and bleeding which was a big concern to me. Both continued into the next morning so I called to see if I should return. The nurse I spoke to on the phone sounded pretty annoyed to be taking my call. She said it sounds like severe UTI symptoms but I didn't do a urine sample when I was there and was up to me if I wanted to come back in because they can't be sure if it's a problem without me being there. A little dismissive of the potential that there could be a problem. But I went back. The second provider I saw had me do a urine sample and assured me that there was no way I could have done the test wrong and injured myself. She said it's normal to have some irritation after the test. I really wish the first provider had told me what to expect and the possibility that these things could happen when doing this kind of test. I probably wouldn't have come back and wasted a whole day worrying that I had done something wrong or hurt myself. Even more, I wish the first provider returned to make sure I didn't have any further questions and make sure the test was completed without any problems or concerns.
September 11, 2025
Very smooth process and much quicker than other urgent care facilities I have used in the past.
September 09, 2025
My experiences at MGH Express has always been positive and smoothly handled..
September 09, 2025
Being from Oregon I very much appreciated the kindness and professionalism of the people I met at the express clinic. If I had an award to give I'd give it to mgh
September 09, 2025
Friendly efficient staff. Caring and compassionate. The Dr was very thorough and explained everything perfectly.
September 09, 2025
I believe my providers name was Stephanie, she was so kind and very in tune with my situation. She called me the next day to check in and offer other tests. Loved her. Thank you for the great care
August 22, 2025
Felt very comfortable with the staff member who put monitor on. He was knowledgeable and respectful and pleasant
August 07, 2025
Normally I get good results in the quickest manner. This time I was sent to the emergency room and had to pay an additional $100. Copay . They didn't do anything that required an emergency room.
August 05, 2025
A great team as usual. Thank you.
August 01, 2025
As an employee at Maine General, I'm not just saying this just to say this. I was very impressed with the express care. I went there after work, thinking it was going to take me at least two hours in there. I was in and out of there in 45 minutes! I was very happy
August 01, 2025
The staff was kind
August 01, 2025
My provider, Stephanie, listened to me, acknowledged what was going on with my health, and prescribed a treatment regiment that really helped me.
July 22, 2025
The team was not sure what to do to stop the bleeding of a vein, but as luck would have it, it stopped while in their care.
July 20, 2025
Grateful that I had somewhere to go on a Sunday morning--fast & professional
July 18, 2025
Very efficient and fast. Follow up call the following day with results of test.
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