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Maria Mercedes Chang Villacreses,

M.D.

Endocrinologist

4.9 (206 Ratings)
Biography photo
Location
City of Hope Duarte
1500 East Duarte Road
Duarte, CA 91010
City of Hope South Pasadena
209 Fair Oaks Avenue
South Pasadena, CA 91030
Specialties
Diabetes, Endocrinology and Metabolism
Education
Medical school:

M.D., Universidad Católica de Santiago de Guayaquil, Guayaquil, Ecuador

Residency:

Internal Medicine - Danbury Hospital Internal Medicine Residency Program, Danbury, CT

Academic Appointments
  • Assistant Clinical Professor, Department of Diabetes, Endocrinology & Metabolism
  • City of Hope Endocrinology Diabetes and Metabolism Fellowship Associate Program Director
About Me

As an endocrinologist at City of Hope® Cancer Center Duarte, Maria Mercedes Chang Villacreses, M.D., is passionate about improving how patients are diagnosed with diabetes, as well as developing new treatments and screening methods. By identifying diabetes early, Dr. Chang Villacreses hopes that patients can receive care before serious complications develop. 

Originally from Ecuador, Dr. Chang Villacreses earned her medical degree with honors from the Universidad Católica de Santiago in Guayaquil, Ecuador. After caring for patients there, she continued her training in the United States at Danbury Hospital in Connecticut and completed a joint fellowship through Harbor-UCLA Medical Center and City of Hope in California. 

She brings both dedication and deep expertise to her work, with the goal of helping people live healthier lives through earlier diagnosis and more personalized care.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, City of Hope.
Jul 26, 2026
5.0
"She's an excellent doctor-very professional, very knowledgeable and truly cares that I'm provided the best treatment for my diabetes"
Jul 18, 2026
4.9
"I prepared for this visit and had researched my questions about treatment options."
Jul 5, 2026
5.0
"Dr. Maria Chang is a sweetheart. She always listens to me and gives me suggestions. I never feel rushed with her and she is very knowledgeable in her field of endocrinology."
Jul 5, 2026
5.0
"It is a good thing to be a patient at City of Hope."
Jun 10, 2026
5.0
"Excellent staff"
Jun 10, 2026
5.0
"Excellent experience!!!"
Jun 7, 2026
5.0
"Dr Chang makes me so at ease through her kindness."
Jun 6, 2026
5.0
"She is calm and thorough. She "gets it" when we talk. She speaks Spanish which makes her very relatable. I feel very comfortable with her."
May 17, 2026
5.0
"She is very thorough."
May 13, 2026
5.0
"Excellent work"
May 13, 2026
5.0
"They care about satisfying the patient Answering our questions"
May 8, 2026
5.0
"Doctor Villacreses is excellent and caring."
May 8, 2026
5.0
"Excellent"
May 6, 2026
5.0
"Good"
May 6, 2026
5.0
"Good"
Apr 23, 2026
5.0
"Good experience"
Apr 23, 2026
5.0
"Good experience"
Apr 19, 2026
5.0
"Dr. Chang is very thorough and reviews in detail the all blood tests to help me understand and manage my type 1 diabetes condition."
Apr 18, 2026
5.0
"The best physician I have ever seen. [...]"
Apr 17, 2026
5.0
"She's a very nice person."
Apr 16, 2026
5.0
"Excellent"
Apr 16, 2026
5.0
"I like the care they provide"
Apr 16, 2026
5.0
"Excellent"
Apr 16, 2026
5.0
"Excellent"
Apr 15, 2026
4.9
"Dr. Chang took the time and made me feel heard. I did not feel rushed and she was thorough in her assessment"
Mar 30, 2026
5.0
"Dr. Chang is awesome!"
Mar 6, 2026
5.0
"Dr Chang Villacreses and staff are phenomenal. Such caring people"
Feb 27, 2026
5.0
"Dr. Chang Villacreses is wonderful! She is efficient and also thoughtful and thorough. She listens and always offers options that she feels would be helpful to me. I appreciate her explanations and options. I always feel I'm under great care with her."
Feb 16, 2026
5.0
"Dr. Chang Villacreses ent into great detail on my blood results. Also sent me a follow up email on suggestions to improve my diet. Showed concern for my bone strength."
Feb 16, 2026
5.0
"I have never met a mean or unhappy employee at CofH. I frequently make this comment to the staff & to my friends."
Feb 10, 2026
5.0
"Wowshe's really good!"
Feb 3, 2026
5.0
"I have recommended City of Hope to many people."
Jan 25, 2026
5.0
"Dr. Chang Villacresses is always very thorough and explains in detail the blood results and they correlate to my diabetic condition."
Jan 24, 2026
5.0
"Dr. Chang Villacreses is exceptional as it relates to the care and knowledge she administers to those in her care."
Jan 21, 2026
5.0
"Doctor is patient and has a great demeanor."
Jan 9, 2026
5.0
"My experience with Dr. Villacreses has been notably the reason why I came back to COH after being away. I appreciate her genuine concerns and gestures to truly wanting to help with my conditions."
Jan 9, 2026
5.0
"She is a very professional Doctor with the extension of the word"
Jan 9, 2026
5.0
"[...] Doctor is very cordial and professional"
Jan 9, 2026
5.0
"Excellent"
Dec 29, 2025
4.7
"I love my doctor concern about me, she is good......"
Nov 22, 2025
5.0
"This doctor is so thorough and calm. She covers so many bases.I feel so confident in her."
Nov 22, 2025
5.0
"Dr. Villacreses is a wonderful doctor."
Nov 20, 2025
5.0
"I owe my physical well-being in large part to Dr. Chang-Villacreces. Every time I see her, she is aware of my medical results, the evolution of my disease and also gives me the best advice to be able to continue maintaining my health."
Nov 15, 2025
4.9
"Dr Chang was very thorough."
Nov 12, 2025
5.0
"Excellent experience"
Nov 12, 2025
5.0
"Good"
Nov 8, 2025
5.0
"She was very thorough in describing the issues involved in some decisions I need to make about treatment."
Nov 7, 2025
5.0
"Dr. Chang is wonderful! I love her approach th patient care."
Nov 7, 2025
5.0
"City of Hope is so well managed. I have always been impressed."
Nov 6, 2025
5.0
"Dr. Chang is very thorough and quickly has applicable staff follow up."
Oct 22, 2025
5.0
"Dr Villacreses was very polite and courteous understanding with my questions and concerns. Very much made eye contact."
Oct 14, 2025
5.0
"Doctor was very helpful"
Oct 14, 2025
5.0
"Excellent"
Oct 14, 2025
5.0
"Excellent"
Oct 4, 2025
5.0
"Dr. CHANG is a very empathetic and attentive physician"