Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Catherine Sibyl Diefenbach, MD

Individual provider Hematology & Oncology Physician · NPI 1982864039

Dr. Catherine Sibyl Diefenbach, MD is a Medical Oncology in New York, New York. Graduated from Perelman School of Med at the University of Pennsylvania in 2001, 25 years ago. Practices with New York University, a 5,884-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
25
Trained at
Perelman School of Med at the University of Pennsylvania
Licensed in
NY
In the registry since
2008
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

160 E 34th St NYU Langone Clinical Cancer Ctr
New York, NY 10016-4744
Phone: (212) 731-5670
Fax: (212) 731-5502
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 231212 (NY)

Record details

NPI number1982864039
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 12, 2008
Last updated in NPPESJanuary 28, 2009

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Medical schoolPERELMAN SCHOOL OF MED AT THE UNIVERSITY OF PENNSYLVANIA
Graduated 2001 (25 years in practice)
Group practice New York University — 5884 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

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