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

Joseph Charles Poen, MD

Individual provider Radiation Oncology Physician · NPI 1972585941

Joseph Charles Poen, MD is a Radiation Oncology in Greenbrae, California. Graduated from University of California, Geffen School of Medicine in 1988, 38 years ago. Practices with Marin Cancer Care, Inc, a 13-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
38
Trained at
University of California, Geffen School of Medicine
Licensed in
CA
In the registry since
2005
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

1350 S Eliseo Dr #100
Greenbrae, CA 94904-2011
Phone: (209) 342-2300
Fax: (209) 324-4240
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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 G66706 (CA)

Record details

NPI number1972585941
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 16, 2005
Last updated in NPPESDecember 8, 2008
Mailing address4301 Northstar Way, Modesto, CA 95356-9262

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, GEFFEN SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Group practice Marin Cancer Care, Inc. — 13 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in Greenbrae