Mark S. Penner, DO
Emergency Medicine Physician · San Jose, CA
Mark S. Penner, DO is an emergency medicine physician with a practice address in San Jose, California, and NPI 1689602500, issued on Jun 29, 2006. Check the license (California 20A8037, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark S. Penner
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A8037 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2105 Forest Ave, San Jose, CA 95128
- Phone
- (408) 947-2500
- Enumerated
- Jun 29, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (818) 587-2493
- Medicaid ID
- 00AX80370 CA
- Medicare enrollment
- Enrolled (PECOS I20040817001477); accepts Medicare assignment
- Medical or professional school
- Western University Of Health Sciences College Of Dental Med, 1994
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 2105 Forest Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sushil Adhikari, M.D.Hospitalist Physician1295907301
- Ailya BatoolStudent in an Organized Health Care Education/Training Program1457702128
- Bryan Beall, DOEmergency Medicine Physician1861870875
- Gail Bellman, M.D.Radiation Oncology Physician1417070723
- Meenesh Bhimani, MDEmergency Medicine Physician1598712069
- Constance Bowie, MDRadiation Oncology Physician1699831420
Verify Mark S. Penner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A8037Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% more Medicare Part D claims than the average emergency medicine physician in 2024
357 Medicare Part D claims for 213 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Ondansetron Odt45 claims
- Famotidine38 claims
- Celecoxib28 claims
- Cefdinir20 claims
- Prednisone20 claims
- Metoclopramide Hcl17 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
- Emergency Physicians Associates San Jose PCSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark S. Penner among 7,751 emergency medicine physician records in California
Mark S. Penner, DO is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1994 · median 2011 among the 4,560 with a school on file
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Jose → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Meenesh Bhimani, MDSan Jose, CA 951281598712069
- Jan Bravo, MDSan Jose, CA 951281083651657
- Michael Chin, MDSan Jose, CA 951281700824042
- Howard Davis, MDSan Jose, CA 951281164464319
- Joan Gates, M.D.San Jose, CA 951281245213727
- Steve Germany, DOSan Jose, CA 951281326076241
- Gregory Groetsema, MDSan Jose, CA 951281790727873
- Benjamin Hafkenschiel, MDSan Jose, CA 951281710940457
Common questions
What is Mark S. Penner, DO's NPI number?
Mark S. Penner, DO's National Provider Identifier (NPI) is 1689602500, issued on Jun 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark S. Penner, DO located?
The NPPES record lists a practice address at 2105 Forest Ave, San Jose, CA, 95128. Phone: (408) 947-2500. Providers update this record themselves, so call before visiting.
How can I verify Mark S. Penner, DO's license?
NPPES lists California license number 20A8037, 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 Mark S. Penner, DO prescribe under Medicare Part D?
In 2024, Mark S. Penner, DO had 357 Medicare Part D claims for 213 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.