Dr. Catherine Diefenbach, MD

Dr. Catherine Diefenbach, MD

Hematology  ·  
Female  ·  
Age 48
Dr. Catherine Diefenbach, MD is a hematology specialist in New York, NY and has been practicing for 14 years. She specializes in hematology, oncology, and more.

240 E 38th St Fl 19

New York, NY 10016

Contact Information

Insurance Accepted

  • Aetna
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of Louisiana
  • Blue Cross Blue Shield of Massachusetts
  • Capital District Physician's Health Plan (CDPHP)
  • Cigna
  • EmblemHealth
  • Empire Blue Cross Blue Shield
  • HealthFirst
  • MultiPlan

*Please verify this information when scheduling an appointment.

Learn about Dr. Diefenbach

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. Diefenbach performs your care needs compared to other doctors.

All Lymphoma
very high
more than 92% of peers
Hodgkin's Disease
more than 89% of peers
Non-Hodgkin's Lymphoma
more than 89% of peers

Dr. Diefenbach'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.

3  Specialties

  • Hematology
  • Medical Oncology
  • Oncology

3  Board Certifications

  • Hematology
    Accredited by: American Board of Internal Medicine*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*
  • Medical Oncology
    Accredited by: American Board of Internal Medicine*

87  Conditions Treated


Read Less

4  Procedures

Background Check

0 Malpractice Claims

No malpractice history found for New York.

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.


  • The Johns Hopkins Hospital
    Residency Hospital | Completed 2004
  • Meml Sloan-Kettering
    Fellowship Hospital | Completed

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Diefenbach has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

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

Dr. Diefenbach's Reviews

Likelihood of recommending Dr. Diefenbach to family and friends
5 total reviews (2 have comments)

Likelihood to Recommend (5)

  • 5
  • 4
  • 3
  • 2
  • 1

Dr. Diefenbach's Performance

  • Trustworthiness

  • Explains condition(s) well

  • Answers questions

  • Time well spent


Office & Staff Performance

  • Scheduling

  • Office environment

  • Staff friendliness

  • Average wait time

    16 to 30 minutes

Patient Comments (2)

Don't expect any sympathy from Doctor Diefenbach. She's unemotional and rather unfriendly. Also, don't expect her to return your calls or emails, or to bother explaining to you what your test results mean (she is way too busy). After that first visit, expect to deal exclusively with her assistants.
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An amazing Dr. who is one of the best in her field. Subject matter expert in Lymphoma, highly personable/family-oriented yet professional at every level. Responsive, timely, caring, interactive... all the things you would hope for in world-class patient care. Her team is also second to none.
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