About
Languages
English
Provider Specialty
Obstetrics & Gynecology
Areas of Care
Conditions
- History of Preterm Birth
Education
Medical School
University of Oklahoma Health Sciences
2015
Internship/Residency - Obstetrics & Gynecology
Tulane University School of Medicine
2019
Locations & Affiliations
Locations
MemorialCare Medical Group - Long Beach (Bixby Knolls)
3711 Long Beach Blvd.
Suite 700
Long Beach, CA
Office: 562-424-8422
Insurance
Please consult your health care provider or health plan for the most accurate information about your health plan’s coverage of a particular health care service offered at a MemorialCare facility. Learn more about our Accepted Health Plans.
Patient Reviews
4.9 out of 5
(294 Ratings)
(294 Ratings)
Jul 17, 2026
Rosario C.
Jul 16, 2026
Cecilia C.
Caring to the patient. Explain everything clearly.
Jul 15, 2026
Veneranda A.
Jul 11, 2026
Anonymous
Exceptional Doctor Who Truly ListensDr Sullivan is a great doctor that cares about her patients. She made me feel at ease during my appointment. She explained in great details the process and made sure that I was comfortable every step of the way. I would also like to add the entire office staff was very welcoming . I would definitely recommend her to friends and family.
Jul 10, 2026
Joyce W.
Jul 10, 2026
Michelle W.
Dr Sullivan is a great doctor that cares about her patients. She made me feel at ease during my appointment. She explained in great details the process and made sure that I was comfortable every step of the way. I would also like to add the entire office staff was very welcoming . I would definitely recommend her to friends and family.
Jul 8, 2026
Ginger W.
The doctor made me feel comfortable and took the time to answer all my questions.
Jul 7, 2026
Shelley M.
Dr. Sullivan is very thoughtful and clear on what is going on with my health, and patient in explaining my options and procedures involved. It is truly rare and appreciated!
Jul 1, 2026
Angeles C.
She is so nice and really ask you about your problem and listen what are you complainingabout
Jun 24, 2026
Dan l.
Dr. Cassidy Sullivan was exceptional. She was professional, knowledgeable, caring, and took the time to answer all my questions. I felt heard and well cared for throughout my visit. I highly recommend her and would rate her 10/10. ~ Ratha
Jun 23, 2026
Ratha C.
Dr. Cassidy Sullivan was exceptional. She was professional, knowledgeable, caring, and took the time to answer all my questions. I felt heard and well cared for throughout my visit. I highly recommend her and would rate her 10/10.
Jun 15, 2026
Mary G.
Jun 9, 2026
Katie H.
I appreciate that she takes the time to listen to me and considers my input.
Jun 8, 2026
Adylene M.
Jun 5, 2026
Amira R.
She took her time , answered all my questions thoroughly , & didn’t feel rushed.
May 22, 2026
Veronica L.
I’ve been coming to this office for years and Dr Sullivan has always been incredible. Very professional, very friendly, and always listens whenever I have questions or concerns. I don’t live near this location but I don’t mind driving a little extra for it. I will always recommend coming here.
May 20, 2026
Jenny R.
Front office, back office staff and the provider were very attentive, professional and treated me with care. I brought up a few healthcare things to my doctor and she took the time to listen, educate me and provide her advice with professionalism, knowledge and respect. I had a great visit!
May 12, 2026
Jennifer O.
Apr 30, 2026
Danielle M.
She’s funny and has great bedside manner
Apr 29, 2026
Ana R.
Very nice and took her time explaining things.
Apr 28, 2026
Layla S.
She’s kind, approachable, and knowledgeable!
Apr 2, 2026
Daniela Y.
Mar 30, 2026
Jessica F.
Dr Cassidy is very easy to talk to, extremely competent, greatly intuitive, and compassionate.
Mar 27, 2026
Kayla O.
Mar 26, 2026
Tannia S.
Very kind and thorough
Mar 26, 2026
Thalia D.
Mar 26, 2026
Rosa M.
Mar 26, 2026
Tracey O.
Dr Sullivan is a good listener. She also responded to my concerns with solutions and a better understanding. It didn't take long but I still felt heard and that means a lot. Plus her staff are genuinely nice and helpful also.
Mar 18, 2026
Lara L.
Mar 13, 2026
Candace L.
Warm, smart & comitted to her patients. .
Mar 9, 2026
Adela C.
Excellen
Mar 5, 2026
Beatriz G.
Nice Dr took the time with me and answered all my questions.
Mar 3, 2026
Denisha J.
Feb 26, 2026
Narissa C.
Feb 20, 2026
Emeli B.
Feb 6, 2026
Katie H.
Takes the time to address my concerns and explains her rationale for treatment
Feb 5, 2026
Elyssa G.
Jan 29, 2026
Chelsea F.
Jan 22, 2026
Jhoanna S.
I really like that Doctor Sullivan thoroughly explains everything also asks if I had any questions.
Jan 15, 2026
Perla I.
Jan 15, 2026
Ingrid B.
Jan 7, 2026
Emelia N.
Jan 6, 2026
Anonymous
Friendly and thoughtfulI appreciated her candor regarding my test results and the feedback she provided to my questions. I liked being asked for my thoughts and desired next steps toward my ongoing care and I feel like we got there together.
Jan 5, 2026
Alexis W.
I appreciated her candor regarding my test results and the feedback she provided to my questions. I liked being asked for my thoughts and desired next steps toward my ongoing care and I feel like we got there together.
Dec 19, 2025
Emily H.
Dec 19, 2025
Chandra H.
My OBGYN retired a few years back. I'm so glad I found Dr. Sullivan thru a referral from my primary care physician.The Staff is very friendly and professional. Dr. Sullivan is caring, gentle, professional and explains things clearly and precisely so you have a clear understanding of everything. Dr. Sullivan also listens and makes time for you to ask questions without making you feel like it's a bother. Every procedure I've had in office went well because she's so comforting.I also appreciate the fact that the office is clean, well organized and nicely decorated. Trust me she's a wonderful physician!
Dec 18, 2025
Lara L.
Dec 17, 2025
Monica P.
Dec 2, 2025
Amanda C.
Dr. Sullivan is amazing. She always answers any questions I have with full attention and explains things carefully. I appreciate her attentiveness and warm energy.
Nov 21, 2025
Vanessa P.
Nov 18, 2025
Staci S.
Nov 14, 2025
Roxana D.
She’s patient and listens to concerns. I feel very comfortable and trust her.
Nov 5, 2025
Anonymous
Calming experienceQuick to see me. Calm and put my worries at ease
Sep 26, 2025
Cassia D.
Dr Sullivan is a very through kind of doctor. She listens and is focused. Highly recommended.
Sep 19, 2025
Kathleen M.
Every thing
Sep 16, 2025
Fatima S.
Súper friendly, informative made me feel safe
Sep 15, 2025
Lois B.
Listened fully, offered ideas and I came away with a plan.
Sep 9, 2025
Gretel G.
Extremely professional and very patient took note of all my needs and requests. Great energy didn't feel rushed or hurried.
Aug 27, 2025
Izabella O.
She was kind, respectful, listened to my concerns and answered all my questions.
Aug 19, 2025
Eunice K.
Dr Sullivan was very kind and empathetic towards me. She was a wonderful doctor to a very anxious new mom like me. Would recommend her!
Aug 12, 2025
Krista A.
Was attentive and thorough
Aug 5, 2025
Ariadna D.
Mar 13, 2025
Nalina A.
She is very caring and informative. I feel comfortable dicussing my health concern with her.
Mar 13, 2025
Ashley G.
Mar 6, 2025
Yoselin T.
She was very attentive, explained all my options as well as any side effects from medication. Was reassuring and made sure all my questions were answered.
Feb 21, 2025
Eleni P.
Dr Sullivan was so comforting, patient and informative.
Feb 20, 2025
Tatiana T.
I really appreciate Dr Sullivan for being kind, polite, informative and attentive and non judgmental while caring for me. I felt safe and all my health questions answered. I am happy to be a patient under her care.
Feb 20, 2025
Tatiana T.
I really appreciate Dr Sullivan for being kind, polite, informative and attentive and non judgmental while caring for me. I felt safe and all my health questions answered. I am happy to be a patient under her care.
Feb 17, 2025
Margaret R.
The ladies at the front desk were super nice and helpful. Dr SUllivan was great and took her time explaining.
Feb 14, 2025
Zelda K.
Able to complete forms online.Dr Cassidy knowledge and service is superb.
Feb 14, 2025
Ashleigh B.
She listens, empathetic and kind.
Feb 12, 2025
Lesley J.
She took the time to fully understand my situation, asked all the right questions, and made decisions based on all the information
Feb 5, 2025
Amanda C.
Doctor listened to my concerns, gave helpful feedback and provided professional care & guidance.
Feb 5, 2025
Yvonne P.
Feb 2, 2025
Mary J.
Feb 1, 2025
Mary T.
Jan 24, 2025
Elsa L.
She takes her time to listen to my concerns and questions, and takes the time to explain all of my questions.
Jan 23, 2025
Alyson M.
Great experience with Dr. Sullivan - it was super efficient.
Jan 23, 2025
Diana G.
Dr. Sullivan, is always attentive, caring and very thorough in her interactions.She is definitely an asset in your team :)
Jan 17, 2025
Nia B.
Jan 10, 2025
Gliseth C.
She solved all my questions. She was kind with us.
Jan 8, 2025
Debra V.
Jan 7, 2025
Abigahil T.
Jan 6, 2025
Grace L.
Everyone here the office is extremely friendly and the office is clean!
Jan 1, 2025
Veronica I.
Dec 30, 2024
Lana M.
Quick! In and out!
Dec 17, 2024
Andrea S.
Her bedside manner. Explained all info, answered my questions. I felt my health mattered, like a very important patient! I love her!
Dec 13, 2024
Jillian W.
She's down to earth and very understanding. She doesn't mind answering questions, and is always thorough in her explanations. In addition, she respects your thoughts and listens, without being dismissive of your concerns. I trust her with my health more than most!
Nov 20, 2024
Regina M.
Very attentive and understanding. I'm very glad to have her as part of my medical team.
Nov 19, 2024
Abigail S.
Nov 12, 2024
Aurora G.
She was very patient and answered all of my questions. She made sure she addressed all of my concerns before leaving the room.
Nov 11, 2024
Glenny C.
She listened to my concern
Nov 6, 2024
Anahiza P.
Nurse AND dr. Actually took the time to hear me out with all issues and concerns i had. They work pretty fast. Dr took the time to explain everything. It was my first visit here.all staff is very friendly as well.
Oct 31, 2024
Adriana C.
Dr. Sullivan listened to me.
Oct 31, 2024
Nanci A.
She explains everything in detail. Kind and to the point
Oct 31, 2024
Brenda C.
Dr. Sullivan was very down to earth and made me feel very at ease. She was personable and informative. This was my first visit with her and I plan on continuing to see her for my annual visits.
Oct 31, 2024
Adriana C.
Dr. Sullivan listened to me.
Oct 23, 2024
Judith D.
Loved that I didn't have to wait. llivan was very personable and easy to talk to. Very professional. Definitely will be asking for her next time.
Oct 22, 2024
Denise C.
She did exactly what I asked of her to make my experience today more comfortable. She listened to me and seemed to care
Oct 22, 2024
Sierra M.
Dr.Sullivan made me feel so comfortable. She’s very knowledgeable and caring. 10/10 would definitely recommend
Oct 18, 2024
Vanessa A.
Very friendly and nice staff.
Oct 18, 2024
Elizabeth C.
Oct 10, 2024
Karen P.
She was very nice and explained everything clearly
Oct 10, 2024
Andrea V.
Doctor Sullivan was friendly and provided thorough explanations and quality personalized care.
Oct 9, 2024
Kristina D.
Easy to make appointmentResponsive admin teamWas seen quicklyFelt listened to
Oct 9, 2024
Peggy B.
Oct 8, 2024
VM
OBGYN visitListened to me, took time to educate, assisted with referrals, efficient, great bedside manner, calming, knowledgeable
Oct 7, 2024
Vani M.
Listened to me, took time to educate, assisted with referrals, efficient, great bedside manner, calming, knowledgeable
Oct 3, 2024
Marlene C.
I really like Cassidy Sullivan as my OB/GYN, she is really sweet answers. All your questions keeps it very professional, but very friendly and can keep up a good conversation. I would say for anyone looking for OB/GYN I would recommend Cassidy Sullivan.
Oct 3, 2024
Tracye S.
Everything, her knowledge her compassion and her patience. I don’t like a number
Oct 3, 2024
Marlene C.
I really like Cassidy Sullivan as my OB/GYN, she is really sweet answers. All your questions keeps it very professional, but very friendly and can keep up a good conversation. I would say for anyone looking for OB/GYN I would recommend Cassidy Sullivan.
Oct 2, 2024
Chrystal R.
Great experience! She listened to what I had to say and provided a course of action!
Oct 1, 2024
Esther B.
She’s honest with me and try to be as gentle as she can be. She also has awesome, thoughtful staff as well.
Sep 30, 2024
Elvia S.
Minimal wait time and took the time to explain the upcoming procedure.
Sep 30, 2024
Ebonee M.
Sep 20, 2024
Georgina L.
Dr. Sullivan was attentive and knowledgeable.She answered all my concerns and questions with clear responses and explanations.I felt I was in good hands.
Sep 19, 2024
Ofie H.
Sep 19, 2024
Natalie G.
Sep 18, 2024
Valerie C.
She’s very responsive and caring. I appreciate her addressing all of my concerns with compassion and her expert knowledge.
Sep 17, 2024
Laura M.
Everyone was super friendly and helpful. Dr Cassidy was awesome she explained everything very well.
Sep 11, 2024
Jayzel P.
Sep 10, 2024
Jacqueline S.
Very thorough and professional, yet friendly and kind. Explained options well.
Sep 10, 2024
sandii 1.
Sep 9, 2024
Sandra U.
SHe is very kind and very professional
Sep 6, 2024
Margarita A.
The doctor was very attentive to answer all my questions
Aug 27, 2024
Kenya M.
Very informative, straight to the point and professional
Aug 27, 2024
Angelica W.
Office staff is so sweet and no matter what Dr I see they are caring, understanding and very informative.
Aug 19, 2024
Eileen R.
Aug 15, 2024
Alejandra B.
Dr. Sullivan is always great with answering any questions you have. She also shows she cares. Anytime I have sent her a message through my chart she always answers in a timely manners
Aug 15, 2024
Alejandra B.
Aug 14, 2024
Misaki C.
She was great on time and kind
Aug 13, 2024
Thelma C.
My appointment with Dr. Sullivan was excellent. She took her time to listen to my questions and concerns, she also explained very kindly the exam and the procedure before hand. I highly recommend complete women care to any patient who’s more comfortable with a female gynecologist Doctor. Front desk and were helpful as well.
Aug 12, 2024
Stacey S.
Frist time for a zoom
Aug 8, 2024
Melissa A.
Very educated and great listen
Aug 7, 2024
Joanna R.
Dr. Sullivan is patient and kind, and knowledgeable. I felt that she listened to me and took my concerns seriously. It seemed like she had a genuine interest in helping me and giving me the care that I needed.
Jul 31, 2024
Adriana C.
Dr. Sullivan made us feel very comfortable and answered all of our questions.
Jul 30, 2024
Whitney R.
much better experience this time, thank you!
Jul 25, 2024
Nichole Y.
Staff friendly and efficient. Little to no wait time. Doctor efficient and informative.
Jul 25, 2024
Nancy C.
Jul 25, 2024
Nancy C.
Jul 20, 2024
Ellen R.
Dr. Sullivan was patient and responsive to my concerns
Jul 16, 2024
Yaritxa V.
Dr.Sullivan was so kind and eased all my nerves.
Jul 10, 2024
Jina S.
Dr Sullivan was professional and caring. She takes her time to address any concerns I had. I really liked that she explained the procedure in detail before examining me. I also liked that she acknowledged my toddler son who had a lot of questions about baby. Thank you.
Jul 8, 2024
Mireya R.
Loved the girlies they were awesome. My first time being there.
Jul 8, 2024
Krissia P.
Jul 6, 2024
Raquel B.
Great Dr and always listens to you and makes you feel less nervous when you are there. Always ready to help and very courteous.
Jun 27, 2024
Carrie A.
Dr Sullivan was great.My appointment was right on time, no waiting, and I felt super comfortable
Jun 27, 2024
Tara G.
Quick, professional and helpful
Jun 26, 2024
Esther W.
Great bedside manner even under difficult situations. Really liked her personality and how she worked with my husband and me with our questions.
Jun 12, 2024
Mallory K.
Jun 12, 2024
Yadira G.
Jun 11, 2024
Trisha K.
Dr. Sullivan has a great personality and makes me feel at ease during my visit. She has a sense of humor and is still very concerned about overall care.
Jun 10, 2024
Diana S.
Professional, knowledgeable and answered all my questions.
Jun 7, 2024
Shawhena L.
Great bedside manner and explained everything well.
Jun 6, 2024
Kja H.
Jun 5, 2024
Tritease K.
How everything that was done was explained. She answered all my questions patiently and thoroughly.
Jun 4, 2024
Tracye S.
I love the personal and the comfortable atmosphere, her knowledge and the personal experience she brings to me.
May 31, 2024
Luana W.
Dr. Sullivan was very thorough, gentle, and did an excellent job explaining every procedure that was required and how she would execute every step throughout my surgery. On the day of my surgery, she checked in twice and made an extra effort to ease my nervousness. She is a well-thought-out, personable, and overall great doctor. I’m very pleased with my procedure and my healing outcome.
May 30, 2024
Julie N.
Dr. Sullivan was professional and very understanding.
May 29, 2024
Sheyla M.
Dr. Sullivan makes you feel comfortable. She answer's to questions you have and looks out for your well being.
May 24, 2024
April M.
Loved everything about my experience with Dr. Sullivan. She was kind, considerate, and confident. She has amazing communication skills, which is extremely important to me. I felt respected and cared for. Looking forward to my next appointment.
May 23, 2024
Jessica R.
May 21, 2024
Monique F.
Very understanding and explains everything well
May 19, 2024
Milette F.
She is knowledgeable patient and kind. I never feel rushed
May 15, 2024
Ari S.
She is absolutely amazing and answers all questions happily.
May 13, 2024
Cynthia R.
Staff were Professional, knowledgeable and friendly. I was made to feel comfortable
May 10, 2024
Kirsten H.
She is personable, caring and considerate of patient needs. I’ve seen her twice and each time she was reassuring and validated my concerns about my health. She is great at her job!
May 10, 2024
Heather C.
Everything! Great doctors who made me feel comfortable and valued. Keep up the good work! Thank you!
May 6, 2024
Irene M.
Very professional she explained things to me and she shows she cares
Apr 30, 2024
Chanry S.
Dr. Sullivan was very caring, was very honest with me, provided me her honest recommendation and gave me other options. The staffs there are very nice and attentive. The whole experience today was great. I walked out with positive mindset and more information than I expected from my last visit. I would like to have her again for my next visit.
Apr 30, 2024
Elyse M.
Dr Sullivan is friendly and knowledgeable. She takes the time to answer all of my questions. I would recommend her to anyone
Apr 29, 2024
Elyse M.
Dr Sullivan is friendly and knowledgeable. She takes the time to answer all of my questions. I would recommend her to any of my friends
Apr 29, 2024
Chanry S.
She was very caring, was very honest with me, provided me her honest recommendation and gave me other options. The staffs there are very nice and attentive. The whole experience today was great. I walked out with positive mindset and more information than I expected from my last visit.
Apr 18, 2024
Yuliana M.
She made me feel comfortable. She answered all my questions and addressed my concerns. She offered solutions to my concerns as well.
Apr 8, 2024
Esther W.
Been going to her for years, and she is always so compassionate and kind. Very personable, patient, and knowledgeable. I always feel comfortable seeing her, and I would recommend her highly.
Apr 3, 2024
Lindsay Z.
Dr Sullivan made me feel comfortable, listened to, and heard.
Apr 3, 2024
Nicole P.
Apr 2, 2024
Jade H.
Apr 1, 2024
Rebecca G.
Doctor was very kind and explained what was going to happened. I felt calm and comfortable with the doctor.
Mar 26, 2024
Ambrie C.
Mar 22, 2024
Hannalei P.
She made me feel comfortable and made sure that she explained and answered all my questions.
Mar 22, 2024
Ann M.
Very understandable . Really nice to me . Treated me with the most respect. Very gentle with me .. very great DR... The nurses were great and Nice .. I recommend this place.... A great caring team.
Mar 21, 2024
Eileen R.
Dr Cassidy is so calmed, knowledgeable, easy to talk to. She also asks questions and gives a lot of feedback. I visited three gynecologists before, she is the best. I’m very glad to have found her.
Mar 20, 2024
Yu C.
Mar 20, 2024
Preciosa V.
Mar 20, 2024
Sonia C.
Mar 20, 2024
Maria C.
Doctor made me feel comfortable and she was professional Also clinic staff were professional
Mar 4, 2024
Ana Z.
Dr. Sullivan was very kind. What stood put most to me was how personable she was and was concerned for how I was doing and opened up the floor to any questions or things I wanted to talk through which was super helpful especially going through pregnancy for the first time. She was able to answer all my questions.
Mar 4, 2024
Maria T.
Mar 4, 2024
maria t.
Mar 2, 2024
Cindy C.
She’s very thorough and takes her time. She answers all my questions. And super friendly and easy going.
Mar 1, 2024
Araceli S.
Feb 29, 2024
Emi A.
She listened and offered solutions.
Feb 29, 2024
Elizabeth M.
Very attentive and courteous, she addressed our inquiries and actively sought additional questions. She possessed a serene demeanor and was very comforting, particularly during discussions pertaining to surgical procedures such as c-sections.
Feb 29, 2024
Vanessa P.
Dr. Sullivan was very caring and helpful.
Feb 28, 2024
Deandralei T.
Feb 19, 2024
Lana M.
Staff and doctor very pleasant. Dr Sullivan was very thorough and sensitive.
Feb 19, 2024
Brittany S.
Feb 16, 2024
Veronica E.
Feb 15, 2024
Milette F.
She is very calm and knowledgeable
Feb 15, 2024
Milette P.
Feb 1, 2024
Teresa M.
Jan 31, 2024
Yaeleen H.
She communicated everything with detail. She talked me through the process. I’m definitely reccommending people to come see her.
Jan 31, 2024
Lisa R.
Jan 22, 2024
Amira R.
Dr Sullivan, listened to all my concerns, she’s never in a rush, always takes her time while in the room.
Jan 11, 2024
Jessica R.
Jan 10, 2024
Cassandra F.
She is very personable. Listens and is proactive.
Jan 10, 2024
Stephanie H.
Dr Sullivan is thorough and takes time to answer questions and makes great suggestions.
Jan 9, 2024
Gladys P.
Jan 9, 2024
Dorina P.
Jan 5, 2024
Tara T.
Jan 5, 2024
Anali F.
Jan 4, 2024
Genesis C.
I like that Dr. Sullivan took her time during my assessment, and provided patient education about my ultrasound results.
Jan 4, 2024
Romanita W.
Makes you feel your time is very important and takes her time to ask questions of any other concerns that need to be addressed. The staff is also very helpful and welcoming. Thanks for your time and great care.
Jan 4, 2024
Natalia O.
She was very welcoming, answered the few questions I had and just was amazing over all.
Dec 27, 2023
Orestine C.
She was purely professional kind and advise to see some who could help me with my problem
Dec 7, 2023
Marquel A.
Dec 7, 2023
Ckyla G.
Very nice informative
Dec 7, 2023
Stephanie B.
Quick, attentive, friendly service
Dec 6, 2023
Julieta M.
Very nice and quick
Dec 6, 2023
Nicole T.
Cassie was very kind and personable. I felt very comfortable with her right away
Dec 6, 2023
Chandra
Dr. Sullivan is a caring & knowledgeable physicianThe Staff is very friendly and professional. Dr. Sullivan is caring, gentle, professional and explains things clearly and precisely so you have a clear understanding of everything. Dr. Sullivan also listens and makes time for you to ask questions. I also appreciate the fact that the office is clean, well organized and nicely decorated.
Dec 5, 2023
Jill S.
Dec 5, 2023
Chandra H.
The Staff is very friendly and professional. Dr. Sullivan is caring, gentle, professional and explains things clearly and precisely so you have a clear understanding of everything. Dr. Sullivan also listens and makes time for you to ask questions. I also appreciate the fact that the office is clean, well organized and nicely decorated.
Nov 29, 2023
Jamilyn F.
She answered all my questions
Nov 27, 2023
Elsa L.
She really listens to what I have to say and takes her time to explain everything. It’s so hard to find a good doctor that actually listens and I’m grateful I found a great OBGYN.
Nov 20, 2023
Veronica L.
Dr Sullivan has always been very professional, polite, and informative every time I’ve seen her. She explains everything she’s doing, and always answers my questions clearly and in a way I will understand. I’ve been going to her for years and will continue to do so.
Nov 17, 2023
Araceli S.
Nov 15, 2023
Fabiola M.
Made me feel very comfortable, answered all my questions
Nov 8, 2023
Kellie L.
She’s the best GYN I’ve ever seen. Thorough, knowledgeable, skilled…and seems like she actually cares.
Nov 8, 2023
Brittany S.
Dr. Sullivan is kind, knowledgeable, and thorough.
Nov 8, 2023
Fabiola M.
Nov 6, 2023
Kelly M.
She is fast, thorough, a good listener, concise communicator, intelligent and cool.
Nov 2, 2023
Kathryn R.
Nov 1, 2023
Fatima M.
The doctor was kind and easy to talk and discuss about my health.
Oct 25, 2023
Michelle M.
Oct 24, 2023
Lynette G.
One on one experience, attentive,
Oct 20, 2023
Dora S.
Dr. Sullivan explains the process when she is examining meTherefore she has gained my trust professionally.
Oct 19, 2023
Katherine C.
She knew the heart beat was important to me and made sure to show it to me and measure it clearly so I understood it was there and healthy!
Oct 19, 2023
Marilyn R.
I Loved my annual "well" check with Dr. Sullivan and staff. The office and staff were organized, and friendly. checked in and was seen right away. Dr. Sullivan was friendly, knowlegable, asked questions to get to know me and spent several minutes listening and answering my questions. She had great customer service and did not rush me in and out, or spend more time with computer rather than the patient like most doctors do these days. At the end of my visit she asked if i had any other questions or concerns again allowing plenty extra time. Then she took care of follow up orders for procedure and meds before i even left the exam room. Dr. Sullivan is a joy to have as a Doctor, i highly recommend her and her staff!
Oct 13, 2023
Emma R.
Such kind staff, Cassidy was awesome — quick examine, talked through every step so I always knew what was going on. Best well women exam I’ve ever had!
Oct 13, 2023
Maria F.
She is very understanding of your concerns
Oct 12, 2023
Teresa M.
Oct 9, 2023
Seblua A.
Oct 6, 2023
Seblua A.
throughly Explanation, postive advice
Oct 6, 2023
Mavel C.
I can say she answer all my questions
Oct 6, 2023
Mavel C.
I always have had a good experience at this clinic.
Oct 6, 2023
Diana M.
I just recently moved to Long Beach and have been slowly researching new doctors. It seems so many Doctors are booked 5 or 6 months in advance - it's been frustrating to say the least. Not with Dr. Sullivan. I've been to her office three times now, once for my annual, once for an ultra sound, and then a follow up. She took the time to listen to my concerns and she answered my questions in a way I could understand. She's thoughtful, friendly, and understanding. At no time did I feel rushed in any way. And her office is so comfortable - big comfy chairs in the lobby (not your standard medical waiting room chairs), her staff is friendly, and I've never waited more than 5 minutes... even when I arrived 20 minutes early. I love that I can check in online, upload my medications, prior labs, anything and everything before the appointment. I appreciate the reminders AND the complimentary valet parking. All in all, a very comfortable, thorough, and informative office and staff. It's not easy finding new physicians. I am truly impressed with, and grateful for, Dr. Sullivan.
Oct 3, 2023
Allison F.
Sep 28, 2023
Lane D.
Cassidy Sullivan listened to my needs and made appropriate referrals. Easy, comfortable and professional wellness check. Friendly support staff and on time appointment!.
Sep 28, 2023
Andrea S.
Wow! This was the best obgyn appt I have ever had and who says that about obgyn!
Sep 27, 2023
Olimpia M.
Sep 20, 2023
Courtney K.
Sep 19, 2023
Barbara H.
Dr. Sullivan is very caring and personal. She takes the time to listen and answer all your questions.
Sep 19, 2023
Joahnna A.
She was great! Claudia was great too.
Sep 19, 2023
Barbara H.
Dr. Sullivan is very caring and personal. She takes the time to listen and answer all your questions.
Sep 12, 2023
Thalia D.
Dr Sullivan takes the time to go over my concerns/questions in a thorough and relaxed manner, doesn't feel rushed.
Sep 12, 2023
Norma E.
The staff and Doctor Sullivan are very friendly and professional. I like going there. 😊
Sep 5, 2023
Stephanie D.
Dr. Sullivan and the staff are amazing and answered all of my questions.
Sep 5, 2023
Stephanie S.
Sep 1, 2023
Yolanda H.
Very professional and thorough.
Aug 30, 2023
Julia P.
Aug 23, 2023
Elizabeth G.
The doctor and staff were very helpful and friendly
Aug 23, 2023
Narissa C.
Doctor was very welcoming & answered all my questions. Very polite & informative.
Aug 11, 2023
Stephanie A.
Very Patient DoctorDr. Sullivan is very patient and easy to talk to. She's thorough and will always allow you to ask any and all questions before the appointment ends. I recommend her and her services.
Aug 9, 2023
Cristina R.
Jul 31, 2023
Alexandra K.
She is patient and listens.
Mar 10, 2025
Cecile A.
Dec 16, 2024
Alison B.
She explained and listened.
Oct 17, 2024
Goodness O.
Very professional and accommodating. Thanks!
Aug 29, 2024
Jennifer M.
Dr. Sullivan answered my questions and concerns.
Aug 13, 2024
Janean A.
Aug 8, 2024
Veronica B.
Jul 8, 2024
Krissia M.
She listen to all the concerns that I had and she is a caring person.
May 16, 2024
Jennifer M.
Apr 19, 2024
Peou B.
Feb 19, 2024
Nati R.
I was able to make an appointment and be seen right away.
Jan 26, 2024
Malak F.
Dec 5, 2023
Audrey P.
Nov 17, 2023
Maryanne L.
Nov 16, 2023
Paula K.
Very personable and has a plan for my care.
Oct 19, 2023
Glenda R.
Feel safe
Aug 10, 2023
Stephanie G.
Dr. Sullivan is very patient and easy to talk to. She's thorough and will always allow you to ask any and all questions before the appointment ends. I recommend her and her services.
Jul 7, 2026
Kellie L.
Mar 10, 2025
Hemina L.
Efficiency
Oct 24, 2023
Tina M.
She was great
Aug 31, 2023
Sandra S.
I had the appointment at 1:45 and I was seen at 2:25pm. The waiting time was too long.
Aug 31, 2023
Joan W.
This was my first visit. Everyone was very nice. The doctor seemed very competent and thorough.
Feb 10, 2025
Katherine P.
No Comment
Aug 6, 2024
Elizabeth G.
Visit was quick and informative.
Nov 27, 2023
Kylene K.
Services were good. I was just a little lost as to what to do after our visit.
Aug 7, 2023
Evelyn C.
Nothing was bad but it was my first time seeing Dr Sullivan
Nov 1, 2024
Anonymous
IUD InsertionShe somehow managed to forget to leave the strings on my IUD, seemingly the easiest task that anyone with a brain could execute correctly. So now, after 4 excruciatingly painful follow up appointments, where they dug around making me bleed- trying to get a hold on the device, I now have to get it surgically removed and will have permanent scars on my stomach. Do not trust this incompetent woman.
Mar 7, 2024
Jasmine G.
I would honestly never go back to this office again! It was quite a terrible experience for me and very unprofessional. Not to mention, everyone in the building was cold and standoffish. When I mentioned I was uncomfortable, Cassidy said, "well nobody likes being here." Cassidy was extremely dismissive of me and my health concerns, to the fact that I had to choose a completely different OB/GYN at another clinic just to receive proper care.I told her I was vegan and when I needed a prescription, she gave me something with gelatin and lactose in it... How does a doctor not know that these are animal-derived ingredients? A quick Google search will help, hon.Im not sure if she was just having a bad day or what, but the basic responsibilities of a doctor were not even remotely met. She did not listen to my concerns about my health as a Black woman, the potential of having fibroids, nor did she schedule any follow-up testing for this. This was a complete waste of time and insurance money. NEVER again.I have since been seeing Dr. Ruthann Devera, who is SUCH a breath of fresh air! Complete 180 from my awful experience with Cassidy Sullivan. I LOVE Dr. Devera!!! 🥰FOLLOW UPIf I could give zero stars, I REALLY would! It keeps getting worse....So after my horrendous experience in 2023, I found a new doctor, got work done, paid for it in full, moved on with my life. Now Im getting calls from a collections agency saying I have an unpaid bill from Cassidy? Impossible. I pay all medical bills within 30 days of receipt. 2 hours and 5 phone calls later, I learn apparently Cassidy never put my street address when she sent my lab work so theyve been trying to reach me and couldnt. Now my creditscore is being impacted from the doctors clerical error?!Im calling again tomorrow to dispute because NOW its outside the time frame to send to insurance... Really?! Every moment in contact with this office further solidifies my decision to NEVER see Cassidy Sullivan again. No doctor visit wouldve been better than taking time and money to go see this "doctor".
Source: Reviews are aggregated from third-party review sites such as Facebook, Google, HealthGrades, RepuGen, Vitals, WebMD, and Yelp.