Dr. William Diehl, MD

Dr. William Diehl, MD

Surgical Oncology  ·  
Male  ·  
Age 60
Dr. William Diehl, MD is a surgical oncology specialist in Florham Park, NJ and has been practicing for 30 years. He graduated from Universidad Anahuac, Escuela De Medicina in 1981 and specializes in surgical oncology, breast surgical oncology, and more.Read his story

140 Park Ave Fl 3

Florham Park, NJ 07932

Contact Information

(973) 404-9980

Insurance Accepted

  • Aetna
  • Amerihealth
  • Blue Cross Blue Shield
  • Cigna
  • Commercial Insurance Company
  • CoreSource
  • EmblemHealth
  • First Health (Coventry Health Care)
  • 13 More

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Learn about Dr. Diehl

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you.

Top Care Areas

See how frequently Dr. Diehl performs your care needs compared to other doctors.

Breast Diseases
very high
more than 95% of peers
more than 76% of peers
Stomach and Small Intestine Cancer
more than 76% of peers

Dr. Diehl's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

Dr. Diehl's bio

This content was provided by Dr. Diehl "Dr. Diehl is a board certified General Surgeon with special interest, training and expertise in Surgical Oncology and Breast Surgical Oncology. He trained at the prestigious Memorial Sloan-Kettering Cancer Center and is part of Summit Medical Group with admitting privileges at Morristown Medical Center and Saint Barnabas Medical Center. Dr. Diehl performs close to 750 surgical procedures a year, and, specific to breast cancer, treats approximately 150 new breast cancer patients"

Care Philosophy

This content was provided by Dr. Diehl "I firmly believe that the most effective doctors are those that treat patients, not diseases. Clearly understanding the disease of the patient is essential, but even diseases vary from patient to patient so I always teach the Surgical Residents that it's even more critical to know the patient than to know the disease. I strive to provide personalized services where I oversee all parts of patient care and am personally involved in all aspects. 

With a specialty in General Surgery and a further Sub-Specialty in Surgical Oncology and Breast Surgical Oncology from Memorial Sloan Kettering Cancer Center, I am able to provide advanced treatment options to patients derived from an extensive, broad base of surgical experience. Summit Medical Group is affiliated with the prestigious MD Anderson Cancer Center in Houston which is the leading cancer center in the world. This affiliation and access to all their treatment protocols and algorithms also allow me to provide the most advanced treatment options available anywhere in the world."

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3  Specialties

  • Surgical Oncology
  • Breast Surgical Oncology
  • General Surgery

1  Board Certifications

  • General Surgery
    Accredited by: American Board of Surgery*

67  Conditions Treated

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43  Procedures

  • Appendectomy, Laparoscopic
  • Appendectomy, Open
  • Bile Duct Procedure
  • Biliary Drainage
  • Biopsy of Breast
  • Breast Surgical Procedure
  • Cholecystectomy With Robotic Assistance
  • Cholecystoenterostomy
  • Colectomy
  • Colectomy and Sigmoidectomy With Robotic Assistance
  • Colon and Rectal Surgery
  • Enterostomy (Laparoscopic or Open)
  • Excision of Bile Duct Tumor
  • Excision of Breast Tumor
  • Excision of Rectal Tumor
  • Excision of Skin Lesion
  • Excision of Stomach Tumor
  • Gallbladder Removal
  • Gallbladder Removal (Cholecystectomy), Laparoscopic
  • Gallbladder Removal (Cholecystectomy), Open
  • Gastrectomy
  • Gastrectomy With Robotic Assistance
  • Gastrotomy
  • Hepatectomy
  • Hernia Repair
  • Incisional Hernia Repair, Laparoscopic
  • Inguinal Hernia Repair, Laparoscopic
  • Inguinal Hernia Repair, Open
  • Laparoscopic Sigmoidectomy With Robotic Assistance
  • Laparoscopic Surgical Procedure
  • Laparotomy
  • Lymph Node Biopsy or Excision
  • Lymphadenectomy With Robotic Assistance
  • Mastectomy
  • Open Incisional and-or Ventral Hernia Repair
  • Pancreatectomy (incl. Pancreas Transplant and Whipple Procedure)
  • Plasmapheresis
  • Port Placements or Replacements
  • Splenectomy
  • Splenectomy and Splenorrhaphy
  • Stomach Surgery
  • Total Splenectomy With Robotic Assistance
  • Umbilical or Ventral Hernia Repair, Laparoscopic
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Background Check

0 Malpractice Claims

No malpractice history found for New Jersey.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Universidad Anahuac, Escuela De Medicina
    Medical School | Graduated 1981
  • Indiana University Med Center
    Residency Hospital | Completed 1982
  • Morristown Meml Hospital
    Residency Hospital | Completed 1986
  • Meml Sloan Kettering Canc C
    Fellowship Hospital | Completed 1988

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Diehl has no media or publications listed.

Languages Spoken

  • English
  • Spanish

Memberships & Professional Affiliations

Dr. Diehl does not have any memberships or affiliations listed. If you are Dr. Diehl and would like to add memberships or affiliations, please update your profile.

Dr. Diehl's Reviews

Likelihood of recommending Dr. Diehl to family and friends
18 total reviews (8 have comments)

Likelihood to Recommend (18)

  • 5
  • 4
  • 3
  • 2
  • 1

Dr. Diehl's Performance

  • Trustworthiness

  • Explains condition(s) well

  • Answers questions

  • Time well spent


Office & Staff Performance

  • Scheduling

  • Office environment

  • Staff friendliness

  • Average wait time

    10 to 15 minutes

Patient Comments (8)

Excellent surgeon
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Steve Adams -Cedar Grove NJ I was not the patient but the husband of one. I thought Dr. Diehl during obviously a difficult time for my wife was wonderful. He was sensitive and really listened and answered all her questions.
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I Didn’t think I would be posting again this year but i again needed a surgeon and of course I called Dr Diehl he is by far a great surgeon he has such compassion and understanding in treating the whole patient I can’t express enough the comfort I felt going into this second surgery knowing Dr...more
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Dr. Diehl performed my breast biopsy. He was wonderful. He was considerate, extremely kind, knowledgeable; and I just knew I was in good hands. He did not rush me out of the office and answered all my questions. He personally called me with the results in three business days after the biopsy....more
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I recently had a breast biopsy done by Dr. Diehl after he was recommended to me by a few people I know and my OBGYN. Not only was he extremely knowledgeable about my situation, he was very kind and caring which is something you do not see most of the time. Very happy with my decision to use him and...more
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