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

Mark K Buyyounouski, MD

Individual provider Specialist · NPI 1912927021

Mark K Buyyounouski, MD is a Radiation Oncology in Stanford, California. Graduated from Rutgers New Jersey Medical School in 2000, 26 years ago. Practices with Stanford Health Care, a 3,085-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California and Pennsylvania.

Years since qualifying
26
Trained at
Rutgers New Jersey Medical School
Licensed in
CA, PA
In the registry since
2006
Specialties on file
3
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

300 Pasteur Dr
Stanford, CA 94305-2200
Phone: (650) 723-4000
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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 C55796 (CA)
Specialist Taxonomy 174400000X · Licence MD4211507 (PA)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence MD421507 (PA)

Record details

NPI number1912927021
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 20, 2006
Last updated in NPPESApril 1, 2016

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolRUTGERS NEW JERSEY MEDICAL SCHOOL
Graduated 2000 (26 years in practice)
Group practice Stanford Health Care — 3085 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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