Gregory Michael Ow
Hospitalist Physician · San Francisco, CA
Gregory Michael Ow is a hospitalist physician with a practice address in San Francisco, California, and NPI 1699352211, issued on Mar 28, 2021. Check the license (California A188385, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Michael Ow
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A188385 CA
Self-reported in NPPES; status is on the state search - Practice location
- 500 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 476-2342
- Enumerated
- Mar 28, 2021
- Record last updated
- Oct 3, 2024
- Medicare enrollment
- Enrolled (PECOS I20240920000029); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2021
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 500 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Gulsedef Arslan, DOStudent in an Organized Health Care Education/Training Program1891358297
- Peter Barish, M.D.Internal Medicine Physician1366861379
- Jeffrey Barry, MDOrthopaedic Surgery Physician1598031304
Verify Gregory Michael Ow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A188385Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average hospitalist physician in 2024
44 Medicare Part D claims for 11 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
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
- Regents OF The University OF CaliforniaSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Michael Ow among 3,099 hospitalist physician records in California
Gregory Michael Ow is one of 3,099 hospitalist physician records with a practice address in California. 90% 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 90% of them.
- NPI issued2021 · 90% of these records are older, 6% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2021 · median 2010 among the 2,505 with a school on file
- Record last updated2024 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in San Francisco → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Seth Blumberg, MD PHDSan Francisco, CA 941431255595443
- Robertino Garcia Cortes, MDSan Francisco, CA 941431770872590
- Robin Goldman, MD, MPHSan Francisco, CA 941431033439906
- Win Han, MDSan Francisco, CA 941431619110384
- Ari HoffmanSan Francisco, CA 941431346566221
- Alison Kuchta, M.D.San Francisco, CA 941431063704963
- Andrew Lai, M.D.San Francisco, CA 941431861666281
- Khoa Lam, M.D.San Francisco, CA 941431801114095
Common questions
What is Gregory Michael Ow's NPI number?
Gregory Michael Ow's National Provider Identifier (NPI) is 1699352211, issued on Mar 28, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Michael Ow located?
The NPPES record lists a practice address at 500 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 476-2342. Providers update this record themselves, so call before visiting.
How can I verify Gregory Michael Ow's license?
NPPES lists California license number A188385, 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 Gregory Michael Ow prescribe under Medicare Part D?
In 2024, Gregory Michael Ow had 44 Medicare Part D claims for 11 beneficiaries; the average among hospitalist physician prescribers was 521. 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.