Skip to navigation Skip to Content
informationMarshfield Clinic Health System combines with Sanford Health. Learn more
mashfield clinic
Sign In
Sign In
Search
Search
Menu
Menu
Search Marshfield Clinic Health System
search clear search term | search
  • Stay connected to your health care.
  • My Marshfield Clinic
    Wisconsin location
    Sign In
  • Marquette Clinic
    Marshfield Medical Center-Dickinson
    Emergency Department Patients Only
    Sign In
    Marshfield Medical Center-Dickinson Acute
    Inpatient & Outpatient Services Patients Only
    Request for Records
  • Dickinson Clinic
    Marshfield Medical Center-Dickinson clinics
    Sign In
  • Dickinson Clinic Follow
    Marquette Center
    Sign In
informationMarshfield Clinic Health System combines with Sanford Health. Learn more  
  1-800-782-8581
Join a world-class health system. Find jobs

Professional Summary down arrow

  • Medical School
    Rush University Medical Center - Rush Medical College Chicago, IL, United States, M.D. 1988

    Internship
    University of South Alabama - College of Medicine Health System Mobile, AL, United States, Internal Medicine 1989

    Residency
    University of South Alabama - College of Medicine Health System Mobile, AL, United States, Internal Medicine 1991

    Fellowship
    University of North Carolina - School of Medicine Chapel Hill, NC, United States, Oncology/Hematology 1995

  • Professional Societies
    American Association for Cancer Research American Society of Clinical Oncology American Society of Hematology Wisconsin Medical Society

    Board Certifications
    Hematology: 1996, recertified 2006 Internal Medicine: 1991, recertified 2005 Medical Oncology: 1995, recertified 2005

    State Licenses
    Wisconsin

    NPI
    1699875922

Patient Ratings down arrow

4.9
out of 5 (216 ratings, 38 comments)
4.9
Provider explanations of my problem
4.9
Provider concern for my questions
4.9
Provider's efforts to include me in treatment decisions
4.9
Provider's discussion of proposed treatment
4.9
My likelihood of recommending this provider

Patient Comments down arrow

Comments are also gathered from the Press Ganey patient satisfaction survey and displayed in their entirety with the exception of any language that may be considered slander, libel or contain private health information, which will be removed prior to publishing.
Comments are from Press Ganey surveys. Slander, libel and private health information are removed.
Sort by:
March 8, 2025
Dr. Delmastro is excellent. We would recommend him to everyone!
March 19, 2025
Dr Delmastro was very kind and compassionate.
March 24, 2025
Dr. Delmastro listened to my concerns and discussed issues and gave me recommendations ...
March 25, 2025
Delmastro is always so good - listens, knowledgeable, clear explanations. If I have to go to an oncologist, he's great!
May 1, 2025
Dr DelMastro has one of the best bedside manners I've ever encountered. I feel heard and he is also very thorough. Very impressed by the amount of time he takes with me!
May 21, 2025
Good experience all times.
May 23, 2025
All good.
May 29, 2025
Dr Delmastro is tops. He is a very start,competent doctor. He answers questions and takes time to explain things. We have been seeing him for many years and I would recommend his expertise to anyone.
July 10, 2025
Always pleased with Dr Delmastro and his team. They are patient, understanding, courteous, and he always thoroughly explains things and answers my questions.
July 11, 2025
Had me come in, unscheduled, as I was having a bad time. Did not give up until he had the solution to my issue. Extremely pleased with the care from Dr Delmastro ...
July 17, 2025
Dr. Delmastro , is always so kind and very interested in you case. And explains everything very clearly. One of the best.
July 21, 2025
Sad to hear the cancer has returned but having this Dr in my corner means the world to me and my family.
July 30, 2025
Not my normal dr., but liked him!
August 4, 2025
ALWAYS excellent care from Dr. Delmastro and his team - they're THE BEST!
August 15, 2025
Dr. Delmastro listens well and is compassionate and professional.
August 18, 2025
Always concerned and very caring.
August 19, 2025
I have complete faith in Dr. Delmastro. He makes all the time you need. That means a lot.
August 20, 2025
Dr. DelMastro is an amazing doctor. Always has time for my questions and answers them in a way I understand.
August 26, 2025
Very nice dr. to work with you feel ilke he is treating someone in his family. Love Dr. Delmastro!!
September 15, 2025
Very good doctor. Explains things well. He has great communication skills.
September 18, 2025
He was very kind and thorough. Showed concern.
September 18, 2025
I am at Marshfield Clinic because I wanted Dr Delmastro as my cancer doctor. He is a wonderful man & doctor.
October 21, 2025
I have had Stage 4 Metastic Breast Cancer and taking oral cancer drugs since almost 8yrs. Dr. Delmastro has been my oncologist since 2017. He is a wonderful caring doctor. I am now 84 yrs. old Beca...view full comment
October 28, 2025
He is a very concerning and knowledgeable Dr. Absolutely the best.
October 31, 2025
Always listens & answers my questions - I never feel rushed at my appointments. Very caring.
November 12, 2025
Good
November 26, 2025
1st contact w/Dr. Delmastro - I have confidence in his handling my cancer treatment.
December 2, 2025
I don't want to recommend Dr. Delmastro to anyone because he'll get too busy! _____. Just kidding. He is SO AWESOME.
December 22, 2025
Dr. DelMastro is brilliant, educated, informative and also very compassionate. I trust him completely.
February 6, 2026
Dr. Delmastro is a very good dr. Staff is very nice & pleasant. Everyone I feel truly care about you and how you're doing. I'm glad I come Marshfield Cancer Center for my care.
February 12, 2026
Dr. Delmastro & his PA Kira were both excellent - very warm, upbeat, real, patient, clear - made me feel good about being in their care.
February 17, 2026
Excellent
February 18, 2026
In my estimation, Dr. Delmastro is the best.
February 21, 2026
I didn't get her name, but Dr. Delmastro's PA was just wonderful. I saw both her and Dr. Delmastro.
February 23, 2026
A+
February 23, 2026
Dean always explains things and asks what I think about treatments or scans. ...
February 27, 2026
Dr. Delmastro is amazing, caring and top notch so grateful for him with my care.
February 26, 2026
Didn't quite understand Tx in future so will have more questions on next visit. Impressed that he is working with other professionals to determine best tx for him.
February 26, 2026
Didn't quite understand Tx in future so will have more questions on next visit. Impressed that he is working with other professionals to determine best tx for him.
March 8, 2025
Dr. Delmastro is excellent. We would recommend him to everyone!
March 19, 2025
Dr Delmastro was very kind and compassionate.
March 24, 2025
Dr. Delmastro listened to my concerns and discussed issues and gave me recommendations ...
March 25, 2025
Delmastro is always so good - listens, knowledgeable, clear explanations. If I have to go to an oncologist, he's great!
May 1, 2025
Dr DelMastro has one of the best bedside manners I've ever encountered. I feel heard and he is also very thorough. Very impressed by the amount of time he takes with me!
May 21, 2025
Good experience all times.
May 23, 2025
All good.
May 29, 2025
Dr Delmastro is tops. He is a very start,competent doctor. He answers questions and takes time to explain things. We have been seeing him for many years and I would recommend his expertise to anyone.
July 10, 2025
Always pleased with Dr Delmastro and his team. They are patient, understanding, courteous, and he always thoroughly explains things and answers my questions.
July 11, 2025
Had me come in, unscheduled, as I was having a bad time. Did not give up until he had the solution to my issue. Extremely pleased with the care from Dr Delmastro ...
July 17, 2025
Dr. Delmastro , is always so kind and very interested in you case. And explains everything very clearly. One of the best.
July 21, 2025
Sad to hear the cancer has returned but having this Dr in my corner means the world to me and my family.
July 30, 2025
Not my normal dr., but liked him!
August 4, 2025
ALWAYS excellent care from Dr. Delmastro and his team - they're THE BEST!
August 15, 2025
Dr. Delmastro listens well and is compassionate and professional.
August 18, 2025
Always concerned and very caring.
August 19, 2025
I have complete faith in Dr. Delmastro. He makes all the time you need. That means a lot.
August 20, 2025
Dr. DelMastro is an amazing doctor. Always has time for my questions and answers them in a way I understand.
August 26, 2025
Very nice dr. to work with you feel ilke he is treating someone in his family. Love Dr. Delmastro!!
September 15, 2025
Very good doctor. Explains things well. He has great communication skills.
September 18, 2025
He was very kind and thorough. Showed concern.
September 18, 2025
I am at Marshfield Clinic because I wanted Dr Delmastro as my cancer doctor. He is a wonderful man & doctor.
October 21, 2025
I have had Stage 4 Metastic Breast Cancer and taking oral cancer drugs since almost 8yrs. Dr. Delmastro has been my oncologist since 2017. He is a wonderful caring doctor. I am now 84 yrs. old Beca...view full comment
October 28, 2025
He is a very concerning and knowledgeable Dr. Absolutely the best.
October 31, 2025
Always listens & answers my questions - I never feel rushed at my appointments. Very caring.
November 12, 2025
Good
November 26, 2025
1st contact w/Dr. Delmastro - I have confidence in his handling my cancer treatment.
December 2, 2025
I don't want to recommend Dr. Delmastro to anyone because he'll get too busy! _____. Just kidding. He is SO AWESOME.
December 22, 2025
Dr. DelMastro is brilliant, educated, informative and also very compassionate. I trust him completely.
February 6, 2026
Dr. Delmastro is a very good dr. Staff is very nice & pleasant. Everyone I feel truly care about you and how you're doing. I'm glad I come Marshfield Cancer Center for my care.
February 12, 2026
Dr. Delmastro & his PA Kira were both excellent - very warm, upbeat, real, patient, clear - made me feel good about being in their care.
February 17, 2026
Excellent
February 18, 2026
In my estimation, Dr. Delmastro is the best.
February 21, 2026
I didn't get her name, but Dr. Delmastro's PA was just wonderful. I saw both her and Dr. Delmastro.
February 23, 2026
A+
February 23, 2026
Dean always explains things and asks what I think about treatments or scans. ...
February 27, 2026
Dr. Delmastro is amazing, caring and top notch so grateful for him with my care.
March 8, 2025
Dr. Delmastro is excellent. We would recommend him to everyone!
March 19, 2025
Dr Delmastro was very kind and compassionate.
March 24, 2025
Dr. Delmastro listened to my concerns and discussed issues and gave me recommendations ...
March 25, 2025
Delmastro is always so good - listens, knowledgeable, clear explanations. If I have to go to an oncologist, he's great!
May 1, 2025
Dr DelMastro has one of the best bedside manners I've ever encountered. I feel heard and he is also very thorough. Very impressed by the amount of time he takes with me!
May 21, 2025
Good experience all times.
May 23, 2025
All good.
May 29, 2025
Dr Delmastro is tops. He is a very start,competent doctor. He answers questions and takes time to explain things. We have been seeing him for many years and I would recommend his expertise to anyone.
July 10, 2025
Always pleased with Dr Delmastro and his team. They are patient, understanding, courteous, and he always thoroughly explains things and answers my questions.
July 11, 2025
Had me come in, unscheduled, as I was having a bad time. Did not give up until he had the solution to my issue. Extremely pleased with the care from Dr Delmastro ...
July 17, 2025
Dr. Delmastro , is always so kind and very interested in you case. And explains everything very clearly. One of the best.
July 21, 2025
Sad to hear the cancer has returned but having this Dr in my corner means the world to me and my family.
July 30, 2025
Not my normal dr., but liked him!
August 4, 2025
ALWAYS excellent care from Dr. Delmastro and his team - they're THE BEST!
August 15, 2025
Dr. Delmastro listens well and is compassionate and professional.
August 18, 2025
Always concerned and very caring.
August 19, 2025
I have complete faith in Dr. Delmastro. He makes all the time you need. That means a lot.
August 20, 2025
Dr. DelMastro is an amazing doctor. Always has time for my questions and answers them in a way I understand.
August 26, 2025
Very nice dr. to work with you feel ilke he is treating someone in his family. Love Dr. Delmastro!!
September 15, 2025
Very good doctor. Explains things well. He has great communication skills.
September 18, 2025
He was very kind and thorough. Showed concern.
September 18, 2025
I am at Marshfield Clinic because I wanted Dr Delmastro as my cancer doctor. He is a wonderful man & doctor.
October 21, 2025
I have had Stage 4 Metastic Breast Cancer and taking oral cancer drugs since almost 8yrs. Dr. Delmastro has been my oncologist since 2017. He is a wonderful caring doctor. I am now 84 yrs. old Beca...view full comment
October 28, 2025
He is a very concerning and knowledgeable Dr. Absolutely the best.
October 31, 2025
Always listens & answers my questions - I never feel rushed at my appointments. Very caring.
November 12, 2025
Good
November 26, 2025
1st contact w/Dr. Delmastro - I have confidence in his handling my cancer treatment.
December 2, 2025
I don't want to recommend Dr. Delmastro to anyone because he'll get too busy! _____. Just kidding. He is SO AWESOME.
December 22, 2025
Dr. DelMastro is brilliant, educated, informative and also very compassionate. I trust him completely.
February 6, 2026
Dr. Delmastro is a very good dr. Staff is very nice & pleasant. Everyone I feel truly care about you and how you're doing. I'm glad I come Marshfield Cancer Center for my care.
February 12, 2026
Dr. Delmastro & his PA Kira were both excellent - very warm, upbeat, real, patient, clear - made me feel good about being in their care.
February 17, 2026
Excellent
February 18, 2026
In my estimation, Dr. Delmastro is the best.
February 21, 2026
I didn't get her name, but Dr. Delmastro's PA was just wonderful. I saw both her and Dr. Delmastro.
February 23, 2026
A+
February 23, 2026
Dean always explains things and asks what I think about treatments or scans. ...
February 26, 2026
Didn't quite understand Tx in future so will have more questions on next visit. Impressed that he is working with other professionals to determine best tx for him.
February 27, 2026
Dr. Delmastro is amazing, caring and top notch so grateful for him with my care.
February 27, 2026
Dr. Delmastro is amazing, caring and top notch so grateful for him with my care.
February 26, 2026
Didn't quite understand Tx in future so will have more questions on next visit. Impressed that he is working with other professionals to determine best tx for him.
February 23, 2026
A+
February 23, 2026
Dean always explains things and asks what I think about treatments or scans. ...
February 21, 2026
I didn't get her name, but Dr. Delmastro's PA was just wonderful. I saw both her and Dr. Delmastro.
February 18, 2026
In my estimation, Dr. Delmastro is the best.
February 17, 2026
Excellent
February 12, 2026
Dr. Delmastro & his PA Kira were both excellent - very warm, upbeat, real, patient, clear - made me feel good about being in their care.
February 6, 2026
Dr. Delmastro is a very good dr. Staff is very nice & pleasant. Everyone I feel truly care about you and how you're doing. I'm glad I come Marshfield Cancer Center for my care.
December 22, 2025
Dr. DelMastro is brilliant, educated, informative and also very compassionate. I trust him completely.
December 2, 2025
I don't want to recommend Dr. Delmastro to anyone because he'll get too busy! _____. Just kidding. He is SO AWESOME.
November 26, 2025
1st contact w/Dr. Delmastro - I have confidence in his handling my cancer treatment.
November 12, 2025
Good
October 31, 2025
Always listens & answers my questions - I never feel rushed at my appointments. Very caring.
October 28, 2025
He is a very concerning and knowledgeable Dr. Absolutely the best.
October 21, 2025
I have had Stage 4 Metastic Breast Cancer and taking oral cancer drugs since almost 8yrs. Dr. Delmastro has been my oncologist since 2017. He is a wonderful caring doctor. I am now 84 yrs. old Beca...view full comment
September 18, 2025
He was very kind and thorough. Showed concern.
September 18, 2025
I am at Marshfield Clinic because I wanted Dr Delmastro as my cancer doctor. He is a wonderful man & doctor.
September 15, 2025
Very good doctor. Explains things well. He has great communication skills.
August 26, 2025
Very nice dr. to work with you feel ilke he is treating someone in his family. Love Dr. Delmastro!!
August 20, 2025
Dr. DelMastro is an amazing doctor. Always has time for my questions and answers them in a way I understand.
August 19, 2025
I have complete faith in Dr. Delmastro. He makes all the time you need. That means a lot.
August 18, 2025
Always concerned and very caring.
August 15, 2025
Dr. Delmastro listens well and is compassionate and professional.
August 4, 2025
ALWAYS excellent care from Dr. Delmastro and his team - they're THE BEST!
July 30, 2025
Not my normal dr., but liked him!
July 21, 2025
Sad to hear the cancer has returned but having this Dr in my corner means the world to me and my family.
July 17, 2025
Dr. Delmastro , is always so kind and very interested in you case. And explains everything very clearly. One of the best.
July 11, 2025
Had me come in, unscheduled, as I was having a bad time. Did not give up until he had the solution to my issue. Extremely pleased with the care from Dr Delmastro ...
July 10, 2025
Always pleased with Dr Delmastro and his team. They are patient, understanding, courteous, and he always thoroughly explains things and answers my questions.
May 29, 2025
Dr Delmastro is tops. He is a very start,competent doctor. He answers questions and takes time to explain things. We have been seeing him for many years and I would recommend his expertise to anyone.
May 23, 2025
All good.
May 21, 2025
Good experience all times.
May 1, 2025
Dr DelMastro has one of the best bedside manners I've ever encountered. I feel heard and he is also very thorough. Very impressed by the amount of time he takes with me!
March 25, 2025
Delmastro is always so good - listens, knowledgeable, clear explanations. If I have to go to an oncologist, he's great!
March 24, 2025
Dr. Delmastro listened to my concerns and discussed issues and gave me recommendations ...
March 19, 2025
Dr Delmastro was very kind and compassionate.
March 8, 2025
Dr. Delmastro is excellent. We would recommend him to everyone!

Honor a Shining Star

Shining star logo

Honor a provider or care team member who makes a difference in your care with a gift through the Shining Star program.

About Us

Our System

Access your account

Electronic Privacy | Terms of Use | Non-discrimination Statement Copyright © 2026 Marshfield Clinic. All Rights Reserved.