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

Dr. Nicolas Demetrios Prionas, MD, PHD

Individual provider Radiation Oncology Physician · NPI 1972840361

Dr. Nicolas Demetrios Prionas, MD, PHD practises Radiation Oncology in San Francisco, California. Graduated from University of California, Davis School of Medicine in 2014, 12 years ago. Practices with University of California San Francisco, a 1,793-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
12
Trained at
University of California, Davis School of Medicine
Licensed in
CA
In the registry since
2013
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

400 Parnassus Ave
San Francisco, CA 94143-2202
Phone: (415) 353-2497
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 39101 Civic Center Dr, Fremont, CA 94538-5817 — (510) 796-7212
  • 4610 X St, Sacramento, CA 95817-2200 — (916) 762-8993

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence A138608 (CA)

Record details

NPI number1972840361
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedJanuary 7, 2013
Last updated in NPPESSeptember 24, 2019

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, DAVIS SCHOOL OF MEDICINE
Graduated 2014 (12 years in practice)
Group practice University Of California San Francisco — 1793 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients145
Services billed 1,081 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at University of California San Francisco

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1793 clinicians in the practice; 12 are shown here.

Other providers in San Francisco