Isabel Rose Ostrer
Internal Medicine Physician · San Francisco, CA
Isabel Rose Ostrer is an internal medicine physician with a practice address in San Francisco, California, and NPI 1912587726, issued on Apr 14, 2021. Check the license (California A192326, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Isabel Rose Ostrer
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A192326 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1001 Potrero Avenue Bldg 5 FL 1M, San Francisco, CA 94110
- Phone
- (628) 206-8494
- Enumerated
- Apr 14, 2021
- Record last updated
- Jul 19, 2024
- Fax
- (628) 206-3012
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Isabel Rose Ostrer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A192326Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
66 Medicare Part D claims for 22 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
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.
Isabel Rose Ostrer among 17,696 internal medicine physician records in California
Isabel Rose Ostrer 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. Its NPI, issued in 2021, is newer than 92% of them.
- NPI issued2021 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2024 · 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.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
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- Stephen Hoffman, MDSan Francisco, CA 941101265476147
- Daniel Kahler, D.O.San Francisco, CA 941101629019781
- Jeanette Krolikowski, D.O.San Francisco, CA 941101962471920
- John Metcalfe, M.D.San Francisco, CA 941101154399350
- Hedda Orkin, MDSan Francisco, CA 941101093753030
Common questions
What is Isabel Rose Ostrer's NPI number?
Isabel Rose Ostrer's National Provider Identifier (NPI) is 1912587726, issued on Apr 14, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Isabel Rose Ostrer located?
The NPPES record lists a practice address at 1001 Potrero Avenue Bldg 5 FL 1M, San Francisco, CA, 94110. Phone: (628) 206-8494. Providers update this record themselves, so call before visiting.
How can I verify Isabel Rose Ostrer's license?
NPPES lists California license number A192326, 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 Isabel Rose Ostrer prescribe under Medicare Part D?
In 2024, Isabel Rose Ostrer had 66 Medicare Part D claims for 22 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.