Dr. William Louis Diehl, MD

FYI:If any post-op issues need to addressed make sure it is done with in 90 days of surgery. Had hernia surgery May '22. Saw Dr. Diehl twice for on-going pain since since the surgery(with-in 90 days). Saw him again for the same on-going pain(after the 90 days)and am now being billed. Appealed the bill with the billing department,was told you get 90 days,end of story.

I trusted Dr. Diehl and Summit Medical Group to help me during an incredibly terrifying time. In Feb 2018, he performed a biopsy on my right breast that proved to be malignant. He then performed a lumpectomy that he completely botched. He removed only a fraction of the tumor leaving over 90% of it behind including the biopsy clip - which he inserted! He then told me he thought the subsequent pathology report was wrong, that he did remove the entire tumor and that he wanted to go back in just to “prove it”. I shudder to think what he would have done if I let him. A pathologist friend, after reviewing my report and speaking with the Summit affiliated pathologist, recommended that I seek another provider. I then went to Memorial Sloan Kettering Cancer Center (MSKCC) in NYC where additional imaging showed that my tumor was still present with the biopsy clip clearly visible. They also reviewed my MRI from Summit Radiology and identified concerns in my left breast that Summit missed. The… subsequent biopsy on my left breast that MSKCC performed showed precancerous lesions. I decided to have much more comprehensive surgery and reconstruction due to my fears that Dr. Diehl’s incompetence put me at higher risk of reoccurrence. When I contacted Summit Medical Group to complain about my experience and Diehl’s incompetence, their medical malpractice company told me that the care I received met Summit’s standard of care. So Summit and Dr. Diehl’s standard of care includes: not using best practice methods for locating and removing tumors; missing areas of suspicion on the MRI; causing compromised reconstruction due to scarring from botched lumpectomy; not giving any preoperative instructions; lying about their own pathology reports to protect their interests and then turning patients over to collections when they refuse to pay for malpractice (in my case for only $575); forcing patients to incur more expenses when their health insurance company refuses to cover tests done a second time (one was a $4,000 genetic test that had to be repeated once my entire tumor was finally removed) as well as subjecting patients to their rude and unprofessional insurance carrier. Please, think twice about using these people. Do your research. Too late, I found a record that Diehl settled a $500,000 malpractice claim in 2015. And yes, I consulted medical malpractice attorneys who said that although I was the victim of malpractice, thanks to my excellent care from MSKCC, my outcome was good enough that we could not sue for high enough damages to make filing a suit feasible. So all I can do is warn others inside and outside the medical community. Facing cancer is scary. Take a deep breath and do your research. There are too many medical groups out there that put profits over people. Good luck and I wish you the best.

Excellent doctor - I had breast cancer 11 years ago, and Dr. Diehl operated on me. When I had a second bout with breast cancer, I would only go to Dr. Diehl for my surgery. He is the best!

Dr. Diehl was clearly capable as well as attentive, informative and able to make me feel that no question or concern was unworthy of discussion. My procedure went as he described it would and fortunately, everything has been fine. I would highly recommend Dr. Diehl.

He is an exceptional doctor caring and compassionate and willing to spend time and explain your diagnosis. He operated on me twice and was always their for me. Have recommended numerous times and have always had great feedback on his care!

Courteous and efficient office staff. High quality doctor who spent time explaining my problem and took care of it expeditiously and without problems. Hospital (Morristown) was great too

I had pancreatic cancer and had been turned down for surgery at 2 New York teaching hospitals because of my other health problems. Dr. Diehl thought he would be able to do the surgery. He removed the cancer and I went home without problems in a short time. He seems to care a great deal about his patients and spends a lot of time explaining things to me. His staff was terrific, especially his nurse practicioner who is always available to his patients for problems or questions. Can't recommend him highly enough!

Dr Diehl is a very professional, compassionate Doctor with top notch skills and staff. I highly recommend him.

Dr. Diehl is an exceptional surgeon with great bedside manner. He took a great deal of time with me to make sure I understood my condition/surgery and made himself available after hours when I had questions prior to surgery (lumpectomy). I was very pleased with the results.

His staff is not the best. Absolutely no follow-up after surgery.