Joseph Charles Poen, MD
Radiation Oncology Physician · Greenbrae, CA
Joseph Charles Poen, MD is a radiation oncology physician with a practice address in Greenbrae, California, and NPI 1972585941, issued on Nov 16, 2005. Check the license (California G66706, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joseph Charles Poen
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- G66706 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1350 S Eliseo Dr, Greenbrae, CA 94904
- Phone
- (209) 342-2300
- Enumerated
- Nov 16, 2005
- Record last updated
- Dec 8, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (209) 324-4240
- Medicaid ID
- 00G667060 CA
- Medicare enrollment
- Enrolled (PECOS I20071207000770); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 1350 S Eliseo Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- David Bloom, MDGastroenterology Physician1619931011
- Crystal Brierton, MA CCC-SLPSpeech-Language Pathologist1679127716
- Linda Clem, PAPhysician Assistant1104899772
- Ilkcan Cokgor, M.D.Neurology Physician1235100603
- Timothy Crowley, M.D.Specialist1669573937
Verify Joseph Charles Poen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G66706Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% more Medicare Part D claims than the average radiation oncology physician in 2024
171 Medicare Part D claims for 55 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Tamsulosin Hcl43 claims
- Methylprednisolone17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Marin Cancer Care, Inc.Greenbrae, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph Charles Poen among 735 radiation oncology physician records in California
Joseph Charles Poen, MD is one of 735 radiation oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1988 · median 2005 among the 545 with a school on file
- Record last updated2008 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
All 735 in California → Every provider in Greenbrae → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Francine Halberg, MDGreenbrae, CA 949041275515256
- Lloyd Miyawaki, MDGreenbrae, CA 949041497737464
- Ernest Torigoe, MDGreenbrae, CA 949041720060700
- Joseph Castro, M.D.San Rafael, CA 949011568708113
- Allan Rappaport, M.D., J.D.Tiburon, CA 949201346310539
- Marc Fields, MDRohnert Park, CA 949281730143066
- Peter Hawkins, M.D., PH.D.Rohnert Park, CA 949281962820621
- Irwin Lee, MDRohnert Park, CA 949281861510760
Common questions
What is Joseph Charles Poen, MD's NPI number?
Joseph Charles Poen, MD's National Provider Identifier (NPI) is 1972585941, issued on Nov 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Charles Poen, MD located?
The NPPES record lists a practice address at 1350 S Eliseo Dr, Greenbrae, CA, 94904. Phone: (209) 342-2300. Providers update this record themselves, so call before visiting.
How can I verify Joseph Charles Poen, MD's license?
NPPES lists California license number G66706, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joseph Charles Poen, MD prescribe under Medicare Part D?
In 2024, Joseph Charles Poen, MD had 171 Medicare Part D claims for 55 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.