
Highlights
Age Groups Seen
- Adult 18-64
- Older Adult 65+
Languages
- English
Gender
MaleAffiliations
- Corewell Health Grand Rapids Hospitals
About Anacleto B Diaz, II
About the Provider
His clinical interests include achievement of better health through education, compassion and developing partnerships with patients.
Locations
- Corewell Health Internal Medicine - 426 Michigan St NE
- 426 Michigan Street Northeast, Grand Rapids, MI 49503
- Get Directions
- phone: 616-267-8338
- fax: 616-459-1909
Experience
Education
- Residency: Ascenstion St John Hospital, Department of Internal Medicine, Internal Medicine, 2010
- Internship: Ascenstion St John Hospital, Department of Internal Medicine, Internal Medicine, 2007
- Medical School: University of the East Ramon Magsaysay Memorial Medical Center, Doctor of Medicine (MD), 2002
Board Certifications
- Internal Medicine: American Board of Internal Medicine, 2009
Insurance
- Aetna/Cofinity
- Align Senior Care MI
- BCBS Medicare Advantage Plus Blue
- BCBS PPO
- BCBS Traditional
- Blue Care Network
- Blue Care Network Medicare Advantage
- Blue Cross Complete
- Cigna
- Coventry First Health
- HAP/ASR
- Humana Military (Tricare East)
- McLaren Commercial
- McLaren Medicaid
- McLaren Medicare Advantage
- Medicaid
- Medicare
- Molina Medicaid/MiChild/Marketplace (Health Plus)
- Molina Medicare
- Priority Health Choice Medicaid
- Priority Health HMO/PPO
- Priority Health Medicare Advantage
- Trinity Health Plan of MI
- UHC/Optum (VA Community Care Network)
- UM Health Plan
- United Health Care Commercial
- United Health Care Dual Complete
Ratings & Reviews
5 out of 5
215 ratings, 96 reviewsCorewell Health is committed to delivering high-quality and compassionate care. These ratings and reviews are transparent patient feedback collected via survey following a provider care experience that asks patients and families about the care they received.
- 5 out of 5 starsReviewed on 3/24/2026
Dr. Diaz is very caring & never rushes the appointment.
- 5 out of 5 starsReviewed on 3/23/2026
Dr Diaz actually saved my life by being proactive. He did a CAT scan to check on some lung modules and they found early. Liver cancer.
- 5 out of 5 starsReviewed on 3/21/2026
He has always been a great supportive doctor with lots of knowledge and he truly listens when I'm speaking and is genuine with his answers or information to share and all around I really like him as my doctor and feel he has me at best interest so Dr Diaz is great
- 5 out of 5 starsReviewed on 3/18/2026
Excellent care!
- 5 out of 5 starsReviewed on 3/17/2026
I need higher ratings to click: like outstanding or above and beyond. He is truly a one of a kind doctor.
- 5 out of 5 starsReviewed on 3/14/2026
His attentive care and thorough follow thru are wonderful. Can't imagine a better MD!
- 5 out of 5 starsReviewed on 3/13/2026
There are none better
- 5 out of 5 starsReviewed on 3/12/2026
He’s the best!
- 5 out of 5 starsReviewed on 3/12/2026
Dr Diaz, understands that each patient has their own separate diagnosis and treatment, (What works for her may not work for him), he’s very thorough he listening and takes action runs test and he takes the time.
- 5 out of 5 starsReviewed on 3/5/2026
Awesome
- 5 out of 5 starsReviewed on 3/3/2026
Such a good listener and very professional
- 5 out of 5 starsReviewed on 2/12/2026
He is very caring and personable. The best Dr. I have ever had.
- 4 out of 5 starsReviewed on 2/10/2026
He tries to solve people issues and is only not successful because of how corewell's practices tie his hands.
- 5 out of 5 starsReviewed on 2/8/2026
I felt like he was genuinely concerned for my health and existing medical conditions. It was a comfortable experience and I felt his genuine concern for my health and well-being.
- 5 out of 5 starsReviewed on 2/3/2026
He was so kind, caring and gentle. He took the time to get to know me as a first time patient. I was so grateful to have found him.
- 5 out of 5 starsReviewed on 2/3/2026
first impression fantastic person impeccable
- 5 out of 5 starsReviewed on 1/26/2026
He is very good and experienced
- 5 out of 5 starsReviewed on 1/22/2026
He has been a godsend. Im a Butterworth dr son and most MD's are not what I grew up with. He is my forever dr
- 5 out of 5 starsReviewed on 1/17/2026
Willing to help me stay off meds.
- 5 out of 5 starsReviewed on 1/15/2026
He explains things well, comes in prepared, I can't say enough as how pleased I am with Dr Diaz
- 5 out of 5 starsReviewed on 1/6/2026
Dr Diaz listened carefully to all my questions and concerns. He looked at me as we talked and did not just stare at the computer. He showed me that he was very interested in what I had to say and answered all of my questions.
- 5 out of 5 starsReviewed on 1/5/2026
Listens, doesn't rush and makes you feel like you're not an inconvenience to him
- 5 out of 5 starsReviewed on 1/3/2026
Dr Diaz is a very thorough and well learned Dr and is not afraid to ask questions about something he isn't filmilar with.
- 5 out of 5 starsReviewed on 1/3/2026
That Diaz allowed me to have a virtual meeting with him over the Internet, and I really appreciate not having to come in and be examined because I was really ill
- 5 out of 5 starsReviewed on 1/3/2026
An excellent doctor!!
- 5 out of 5 starsReviewed on 1/2/2026
Very caring about his patience
- 5 out of 5 starsReviewed on 12/20/2025
Best doctor anyone could have.
- 5 out of 5 starsReviewed on 12/20/2025
Excellent
- 5 out of 5 starsReviewed on 12/20/2025
I will not see any other internist...unless a situation forces me to.
- 5 out of 5 starsReviewed on 11/27/2025
Great
- 5 out of 5 starsReviewed on 11/25/2025
Dr. Diaz is the best.
- 5 out of 5 starsReviewed on 11/23/2025
Dr. Diaz was totally aware of all my medical problems on my first visit. He explained everything very clearly and in detail so I understood
- 5 out of 5 starsReviewed on 11/22/2025
Dr. Diaz is a great diagnostician who is also very warm and personable. He listens to everything and considers the next steps carefully. I’m very happy to have him on my side!
- 5 out of 5 starsReviewed on 11/20/2025
He is an excellent doctor with great interpersonal skills.
- 5 out of 5 starsReviewed on 11/19/2025
I trust Dr Diaz to have my best interests in mind. He actually saved my life. He was following some modules in my lungs so ordered a CAT scan. Besides my lungs, this showed a liver tumor which was taken care of in its early stages. If he hadn’t been so thorough I would be in big trouble.
- 5 out of 5 starsReviewed on 11/19/2025
I trust him
- 5 out of 5 starsReviewed on 11/18/2025
He is very knowledgeable and thoural.
- 5 out of 5 starsReviewed on 11/17/2025
He is a rockstar
- 5 out of 5 starsReviewed on 11/17/2025
Excellent in knowledge and bedside manner.
- 5 out of 5 starsReviewed on 11/4/2025
Very good doesn’t describe Dr Diaz. He is above excellence.
- 5 out of 5 starsReviewed on 11/4/2025
Always takes time and care which I so appreciate
- 5 out of 5 starsReviewed on 11/1/2025
Dr has excellent knowledge, is very personable and easy to talk to
- 5 out of 5 starsReviewed on 10/30/2025
Always thorough and extremely knowledgeable and informative. Dr. D is the best.
- 5 out of 5 starsReviewed on 10/28/2025
Pleasant and easy to talk to.
- 5 out of 5 starsReviewed on 10/25/2025
Very understanding and caring
- 5 out of 5 starsReviewed on 10/21/2025
Excellent care
- 5 out of 5 starsReviewed on 10/21/2025
Before Dr Diaz. I had 4 previous doctors after a spinal injury. My first visit with Dr Diaz at your Kalamazoo Ave location went extremely well. I had brought in printed documents as well as CD's of my imaging. Dr Diaz spent a good 40 minutes at first, reviewing my history, a first!!! I have followed Dr Diaz from there to his two downtown locations.
- No RatingReviewed on 10/18/2025
A wonderful caring doctor
- 5 out of 5 starsReviewed on 10/9/2025
We feel completely confident in the health care Dr. Diaz provides for us, and we recommend him highly.
- 5 out of 5 starsReviewed on 10/8/2025
Kind intelligent person who cares
- 5 out of 5 starsReviewed on 10/5/2025
Dr.Diaz is an excellent listener and helps you understand what is happening. If referrals are needed , Dr.and staff are on it.
- 5 out of 5 starsReviewed on 10/3/2025
Very professional and knowledgeable, competent physician. He cares and we trust him. He definitely works best when he is not hurried and we arrive with a written list of our concerns. An EXCELLENT provider!
- 5 out of 5 starsReviewed on 10/2/2025
As I said he is the very best doctor I have ever had as my doctor.
- 5 out of 5 starsReviewed on 10/1/2025
Continue to support the patient with health care planning
- 5 out of 5 starsReviewed on 9/27/2025
He has personally experienced some of the same health problems as me and understands completely.
- 5 out of 5 starsReviewed on 9/26/2025
Dr Diaz & I make a good team. I am delighted and thankful to have Dr Diaz. He gives me the very best possible Medical care. God has Blessed his practice.
- 5 out of 5 starsReviewed on 9/25/2025
He listens when you may bring up something you have a concern with.
- 5 out of 5 starsReviewed on 9/25/2025
very happy with him.
- 5 out of 5 starsReviewed on 9/24/2025
The same thing is very good
- 5 out of 5 starsReviewed on 9/24/2025
I feel comfortable with him being my primary care doctor.
- 5 out of 5 starsReviewed on 9/23/2025
He is more of a friend than a paid provider
- 5 out of 5 starsReviewed on 9/23/2025
He is the best.
- 5 out of 5 starsReviewed on 9/18/2025
He is the best you bestvtreat him well!
- 5 out of 5 starsReviewed on 9/17/2025
He knows me, very professional, but exceptionally knowledgeable
- 5 out of 5 starsReviewed on 9/15/2025
Been working with Dr Diaz for years. He takes good care of me!
- 5 out of 5 starsReviewed on 9/11/2025
Dr. Diaz is the best
- 5 out of 5 starsReviewed on 9/10/2025
Very caring. Takes his time with you and explains things.
- 5 out of 5 starsReviewed on 9/4/2025
He just has a beautiful heart for people and their concerns.
- 5 out of 5 starsReviewed on 9/4/2025
He is the best. Listens well, explains things thoroughly. Follows through reliably
- 5 out of 5 starsReviewed on 9/3/2025
Dr. Diaz was very thorough and I didn't feel rushed at all during the appointment.
- 5 out of 5 starsReviewed on 9/3/2025
Friendly and professional.
- 5 out of 5 starsReviewed on 8/27/2025
Amazing first visit with him. Listens to my concerns. Taking steps to address my needs
- 5 out of 5 starsReviewed on 8/20/2025
Dr. Diaz relates to his patients and truly cares about getting them the care they need. He covers a lot of ground in a short appointment time. He is a very smart man , but can explain things in a very understandable way.
- 5 out of 5 starsReviewed on 8/17/2025
I have no words to express how much I trust Dr Diaz. I don’t question him if he says anything, like I do other doctors, he’s the best doctor I have. The best I’ve ever had.
- 5 out of 5 starsReviewed on 8/16/2025
He is a very caring doctor and extremely knowledgeable.
- 5 out of 5 starsReviewed on 8/13/2025
He is great. Very pleased he joined your practice at IM. Excellent addition.
- 5 out of 5 starsReviewed on 8/9/2025
Dr. Diaz is the best! I have followed him from two previous practices and will keep following him wherever he goes. He really listens to not only my symptoms, but to me as a person as well. He always offers me a couple of options of care, and explains why. We discuss them and then he offers the one he feels will best suit my situation. He's very caring and personable.
- 5 out of 5 starsReviewed on 8/8/2025
He is the best physician on the planet.
- 5 out of 5 starsReviewed on 8/4/2025
He listens & explains
- 5 out of 5 starsReviewed on 8/2/2025
He is the model doctor that every doctor should be.
- 5 out of 5 starsReviewed on 8/1/2025
Your rating scale does not allow the ability to clearly state how incredible Dr Diaz is!!!
- 5 out of 5 starsReviewed on 7/30/2025
He's brilliant, sensitive to his patients needs and very caring!
- 5 out of 5 starsReviewed on 7/30/2025
Anacleto is one of the nicest caring people O have ever met in the health care industry this far.
- 5 out of 5 starsReviewed on 7/30/2025
He is like talking to a family member.
- 5 out of 5 starsReviewed on 7/29/2025
I'm glad to have Dr Diaz as my new physician!
- 5 out of 5 starsReviewed on 7/28/2025
Exceptional knowledge, thorough exam an pleasant demeanor! 😊
- 5 out of 5 starsReviewed on 7/24/2025
makes you feel safe
- 5 out of 5 starsReviewed on 7/24/2025
Dr. Diaz is one of the Best Doctors. This office is very blessed to have him!
- 5 out of 5 starsReviewed on 7/21/2025
Like how explained everything during the exam.
- 5 out of 5 starsReviewed on 7/18/2025
Luv him
- 5 out of 5 starsReviewed on 7/18/2025
Dr. Diaz cares about me and is always concerned with giving me the best care.
- 5 out of 5 starsReviewed on 7/14/2025
Excellent Doctor
- 5 out of 5 starsReviewed on 7/11/2025
Very satisfied and would recommend to others
- 5 out of 5 starsReviewed on 7/9/2025
Have to wait and see if change in meds will help.
- 5 out of 5 starsReviewed on 7/8/2025
I felt better just having my appt with Dr Diaz
- 5 out of 5 starsReviewed on 7/8/2025
I appreciate his professional-yet-personal bedside manner. He is extremely knowledgeable and caring.