Mark Oscherwitz, MD
Internal Medicine Physician · San Francisco, CA
Mark Oscherwitz, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1437225059, issued on Nov 27, 2006. Check the license (California C020057, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Oscherwitz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C020057 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1199 Bush Street, San Francisco, CA 94109
- Phone
- (415) 673-7600
- Enumerated
- Nov 27, 2006
- Record last updated
- Dec 17, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 673-8065
- Medicaid ID
- 00C200570 CA
- Entity
- Type 1 · individual
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Verify Mark Oscherwitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C020057Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Oscherwitz among 17,696 internal medicine physician records in California
Mark Oscherwitz, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Edwin Hassid, M.D.San Francisco, CA 941091033140702
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- Martin Liberman, MDSan Francisco, CA 941091376530006
- Deborah Lindes, M.D.San Francisco, CA 941091952323776
- Aravind Mani, MDSan Francisco, CA 941091932151941
Common questions
What is Mark Oscherwitz, MD's NPI number?
Mark Oscherwitz, MD's National Provider Identifier (NPI) is 1437225059, issued on Nov 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Oscherwitz, MD located?
The NPPES record lists a practice address at 1199 Bush Street, San Francisco, CA, 94109. Phone: (415) 673-7600. Providers update this record themselves, so call before visiting.
How can I verify Mark Oscherwitz, MD's license?
NPPES lists California license number C020057, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.