What patients are saying
Overall rating
4.75
Average wait time
4.64
Bedside manner
4.85
“Excellent Dr Fastenberg was extremely Professional and knowledgeable conveying confidence as he listened to my medical issues and concerns. Dr Fastenberg without any hesitation, communicated his medical plan of action to resolve my medical issues. Dr Fastenberg took the time to make sure that I understood and that I agreed with his medical solution. I have been a patient of Dr. Fastenberg's for many years and I am always warmly greeted by the Doctor and his entire staff. I recommend Zocdoc for making appointments and I highly recommend Dr Fastenberg ”
FREDERICK H.December 5, 2025
“My experience was friendly from the moment I walked in to the office. I was greeted almost immediately at the front desk, I was called in 3 minutes later, and the doctor and his assistant were pleasant throughout the visit.”
Kathryn A.September 8, 2025
About Dr. Michael Fastenberg
Long Island native Dr. Michael Fastenberg is a board-certified dermatologist at Schweiger Dermatology Group in Smithtown, New York. Dr. Fastenberg attended Jericho High School and received his undergraduate degree from Duke University (cum laude). Dr. Fastenberg returned to Long Island after working and living in various places around the world. He received his medical degree from the Stony Brook School of Medicine (Alpha Omega Alpha) and completed his internship in internal medicine at Winthrop University Hospital in Mineola. He then completed his dermatology residency at the University of North Carolina Hospitals in Chapel Hill, NC. He has performed research in biochemistry, cell biology and dermatology, has been published in peer reviewed journals and has presented at local and national meetings. Dr. Fastenberg specializes in general adult, pediatric and surgical dermatology as well as cosmetic dermatology, including Botox, fillers and laser procedures. Dr. Fastenberg is on faculty at St. Catherine of Siena Medical Center in Smithtown, NY.
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In-network insurances
99% of patients have successfully booked with these insurances
Aetna
BlueCross BlueShield
Cigna
Emblem Health
Medicare
UnitedHealthcare
UnitedHealthcare Oxford
Office locations
Schweiger Dermatology Group - Smithtown (1 of 5)
260 Middle Country Rd, Ste 208, Smithtown, NY 11787
Schweiger Dermatology Group - Great Neck (3 of 5)
825 Northern Blvd, Ste 300, Great Neck, NY 11021
Schweiger Dermatology Group - Rykowski Lane (4 of 5)
28 Rykowski Ln, Middletown, NY 10941
1 of 5
Education and background
Practice names
Board certifications
- American Board of Dermatology
Education and training
- Medical School - State University of New York, Stony Brook, Doctor of Medicine
- Winthrop-University Hospital, Internship in Internal Medicine
- University of North Carolina, Residency in Dermatology
- Duke University (Bachelor’s)
Professional memberships
- American Academy of Dermatology
Awards and publications
- Castle Connolly Top Doctor
- 2024 Castle Connolly Top Doctor
Languages spoken
- English
- Spanish
Provider's gender
Male
NPI number
1073735593
Patient reviews
All reviews have been submitted by patients after interacting with the practice.
Overall rating
4.75
Wait time
4.64
Bedside manner
4.85
Your trust is our top concern, so providers can't pay to alter or remove reviews. We also don't publish reviews that contain any private patient health information. Learn more here
990 reviews
Most relevant
My family and I have known Dr. Fastenberg for many years.
He is a caring and patient doctor.
September 11, 2025Victor P.Verified patient
The office visit went smoothly and quickly being one of the first in the morning. The staff was friendly and understanding.
March 2, 2023Peter B.Verified patient
Crazy Weather today.
But Dr Fastenberg and his Assistants were all willing to help and set up for my next appointment!
September 6, 2022Patricia B.Verified patient
Dr. Fastenberg is wonderful; caring, personable and professional. Sad that we have to post "poll comments" in this era.
July 11, 2017Theresa K.Verified patient
The Doctor was attentive to my needs and questions .
She also explained to me the type of marks I have on my body .
July 25, 2021James G.Verified patient
I was taken care of right away. Dr. Fastenberg was excellent as usual in providing the treatment and advise I needed.
More than 1 year agoGregory A.Verified patient
One of the best providers I have ever seen. Professional, great listener, compassionate and the staff is amazing.
August 10, 2021Julove J.Verified patient
Completely rushed. So disappointed. Went there for help with my skin and felt completely brushed off. No compassion.
October 27, 2019Brittany N.Verified patient
Doctor was very helpful and clear about what he was doing. Explained everything and took his time.
March 18, 2024Vincent S.Verified patient
As always, Dr. Fastenberg was terrific. I see him on a regular basis and would not see anyone else. He is the best!
February 21, 2018Heather R.Verified patient
My visit was very pleasant indeed. Dr. Fastenberg is my favorite dermatologist ever. I'd recommend to everyone.
March 1, 2017Arunee M.Verified patient
It ran smoothly and Dr. Fastenburg was very informative. he took his time to introduce and explain all options.
June 16, 2020Mara G.Verified patientVideo visit
Great visit! Fast check -in with epad. Minimum wait time even though they were very busy. Would def go back!!
July 18, 2021Peter M.Verified patient
DR FASTENBERG IS ALWAYS PROFESSIONAL, PERSONABLE & THOROUGH.
I AM PLEASED WITH THE SERVICES HE PROVIDES.
More than 1 year agoInitials hidden
Loved this provider and team! No wait time for my appt! Empathetic and knowledgable provider and team!
August 31, 2022Starnaisa W.Verified patient
Too many offices. Location of offices confusing. Dr. Katelin Finn and her assistant were very friendly.
March 22, 2022Patricia M.Verified patient
Dr Fastenberg is always professional and friendly. Does a great job and will continue to use him.
March 20, 2023Beth C.Verified patient
Nice people. Easy sign in. No wait. I’ll be going back for a checkup. Definitely would recommend.
March 13, 2023Angelina S.Verified patient
He took the time to fully address my concerns and wasn't rushing. Very pleasant. Will definitely return.
More than 1 year agoInitials hidden
Everyone was really nice and super accommodating. Will be back with my husband for future skin checks.
December 11, 2020Megan M.Verified patient
Felt welcoming for the first time. Well attended to, friendly staff with great communication. ??????
April 18, 2021Oluwatoyin A.Verified patient
Very pleasant and thorough. He seemed a bit rushed but the waiting room was full so I could understand.
December 14, 2017Douglas S.Verified patient
Dr. Fastenberg is the man. Incredible doctor, great personality and he really does an amazing job.
July 1, 2020Trevor K.Verified patient
My visit was quick and my concerns were addressed efficiently! An overall pleasant Doctor visit!
January 23, 2017Maureen H.Verified patient
Dr. Fastenberg is great. I am a regular patient of his and would strongly recommend him any time!
December 2, 2016Heather R.Verified patient
Doc Fastenberg was the best! He was kind and really was very knowledgeable ! Best doc around !
More than 1 year agoInitials hidden
Dr Fastenberg is a very thorough doctor who is always friendly and explains everything clearly.
December 2, 2016Jim D.Verified patient
Dr. Fastenbyrg is Very knowledgeable and caring, pleasant
April 30, 2025Jacqueline M.Verified patient
Kaitlyn Spadalik was great! Kind, and explained the whole process with great bedside manner
June 18, 2021Anthony R.Verified patient
I am a regular patient of Dr. Fastenberg and think he is terrific. Would follow him anywhere!
October 17, 2017Heather R.Verified patient
Visit was professional and friendly. Addressed everything I needed to be treated for.
February 12, 2018Gregory A.Verified patient
Well I was there everything it’s good put I need other specialist on my case
April 4, 2023Lucy S.Verified patient
Dr. was very thorough and personable. Short wait time too! Definitely recommend.
August 30, 2021Nicole C.Verified patient
Great experience with Dr. Fastenberg and his staff. Highly recommend his practice.
December 3, 2020Dylan C.Verified patient
Very professional. Office was clean and bright. Staff very helpful and friendly
May 19, 2022Yyvonne S.Verified patient
Very helpful to have this service in these times. All my questions were answered!
April 9, 2020Initials hiddenVideo visit
Very good chair side manners! Will be booking my next appt with Dr. Fastenberg!!
More than 1 year agoKyon S.Verified patient
Good experience all around, would definitely come back. Thank you!
October 4, 2023Patricia M.Verified patient
He's very personable and knowledgable. Explains things so you can understand.
May 10, 2017Michael J D.Verified patient
Fast and easy. Great staff. Quick service. Would recommend to anyone!
April 12, 2022Michael M.Verified patient
The MD was very informative and answered all my questions and concerns.
December 13, 2018Rachelle T.Verified patient
I saw joe and he was efficient and kind. Staff was nice and helpful
June 8, 2022Initials hidden
Great office and doctor! Highly recommend and so happy I chose them.
October 1, 2021Joseph C.Verified patient
Took care of all issues and concerns.
Friendly and caring
October 31, 2023Ronald M.Verified patient
Great office! I saw the NP and will be back next year for my TBE
May 10, 2022Shirley E.Verified patient
Dr. Fastenberg is wonderful. Kind, considerate and caring doctor.
March 24, 2021Jennifer S.Verified patient
Dr. Fastenberg is a wonderful Dr., and I would HIGHLY recommend him.
January 23, 2017Mindy A.Verified patient
Visit was very good. He is addressing all my problems and concerns.
December 16, 2016Gregory A.Verified patient
Doctor was professional and answered all the questions I had .
April 2, 2022James G.Verified patient
would highly recommend if anyone
needs to see a dermatologist.
More than 1 year agoRichard T.Verified patient
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How soon can I make an appointment with Dr. Michael Fastenberg?
Generally, Dr. Michael Fastenberg has appointments available on Zocdoc within 1 week. You can see Dr. Fastenberg's earliest availability on Zocdoc and make an appointment online.
Is Dr. Michael Fastenberg accepting new patients?
Dr. Michael Fastenberg generally accepts new patients on Zocdoc. You can see Dr. Fastenberg's earliest availability on Zocdoc and schedule an appointment online.
Does Dr. Michael Fastenberg accept my insurance?
Choose your insurance plan to verify if Dr. Fastenberg is in-network.
Can I make an appointment with Dr. Michael Fastenberg online?
Yes, you can make an appointment online with Dr. Fastenberg using Zocdoc. It’s simple, secure, and free.
What practice does Dr. Michael Fastenberg work with?
Dr. Michael Fastenberg works with Schweiger Dermatology Group.
Where is Dr. Michael Fastenberg's office located?
Dr. Michael Fastenberg has 5 office locations, including in Mattituck, Smithtown, Great Neck, Middletown, and Patchogue, view full addresses on Dr. Fastenberg's profile.
Which board certifications does Dr. Michael Fastenberg have?
Dr. Michael Fastenberg is certified by American Board of Dermatology.
What are common reasons for patients to see Dr. Michael Fastenberg?
Dr. Michael Fastenberg frequently sees patients for Acne, Annual Skin Screening, Dermatology Consultation, Hair Loss, and Rash. You can see other visit reasons for Dr. Michael Fastenberg on their profile.
What languages does Dr. Michael Fastenberg speak?
Dr. Michael Fastenberg speaks English and Spanish.
How do patients rate Dr. Michael Fastenberg in reviews?
990 patients have reviewed Dr. Michael Fastenberg. The overall rating for this doctor is 4.75/5. They have a 4.85/5 rating for bedside manner and a 4.64/5 rating for wait time. You can read individual reviews and ratings on their profile.