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

Dr. Marshall Andrew Diven, MD, MS

Individual provider Radiation Oncology Physician · NPI 1649809351

Dr. Marshall Andrew Diven, MD, MS is a Radiation Oncology in Brooklyn, New York. Graduated from University of South Carolina School of Medicine, Greenville in 2019, 7 years ago. Practices with Memorial Hospital of Sheridan County, a 86-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Montana and Wyoming.

Years since qualifying
7
Trained at
University of South Carolina School of Medicine, Greenville
Licensed in
MT, WY
In the registry since
2020
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MS — Master of Science
A graduate science degree.

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Practice location Address checks out

506 6th St
Brooklyn, NY 11215-3609
Phone: (718) 780-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 148872 (MT)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 18641A (WY)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1649809351
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MS
Sole proprietorNo
NPI enumeratedApril 4, 2020
Last updated in NPPESOctober 16, 2025
Certification dateOctober 16, 2025

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF SOUTH CAROLINA SCHOOL OF MEDICINE, GREENVILLE
Graduated 2019 (7 years in practice)
Group practice Memorial Hospital Of Sheridan County — 86 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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