Frederick Sewoong Oh, M.D.
Family Medicine Physician · Orinda, CA
Frederick Sewoong Oh, M.D. is a family medicine physician with a practice address in Orinda, California, and NPI 1083840458, issued on May 30, 2009. Check the license (California A118307, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frederick Sewoong Oh
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A118307 CA
Self-reported in NPPES; status is on the state search - Practice location
- 12 Camino Encinas, Orinda, CA 94563
- Phone
- (510) 204-8180
- Enumerated
- May 30, 2009
- Record last updated
- Feb 29, 2024
- Medicare enrollment
- Enrolled (PECOS I20131108001840); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 12 Camino Encinas
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jill Foley, M.D.Obstetrics & Gynecology Physician1174631709
- Marilyn Honegger, M.D.Obstetrics & Gynecology Physician1376548156
Verify Frederick Sewoong Oh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A118307Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average family medicine physician in 2024
204 Medicare Part D claims for 184 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin41 claims
- Amoxicillin-Clavulanate Potass23 claims
- Ofloxacin15 claims
- Nitrofurantoin Mono-Macro13 claims
- Paxlovid13 claims
- Doxycycline Monohydrate11 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
- Sutter Bay Medical FoundationOrinda, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frederick Sewoong Oh among 17,133 family medicine physician records in California
Frederick Sewoong Oh, M.D. is one of 17,133 family 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 2009, is newer than 58% of them.
- NPI issued2009 · 58% of these records are older, 40% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2007 · median 2005 among the 10,652 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 family medicine physician records list a practice address in Orinda
They are 9 of the 278 NPPES records with a practice address in Orinda, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Orinda → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Omeed Atefi, DOOrinda, CA 945631073141099
- Anny Ching, M.D.Orinda, CA 945631376961490
- Roger Iliff, M.D.Orinda, CA 945631235244716
- Gagan Malhi, DOOrinda, CA 945631366070807
- Tiffany McClure, MDOrinda, CA 945631891358313
- Sri Nimmagadda, MDOrinda, CA 945631487090247
- Michelle Simi, M.D.Orinda, CA 945631346465630
- Malaika Stoll, M.D.Orinda, CA 945631366616799
Common questions
What is Frederick Sewoong Oh, M.D.'s NPI number?
Frederick Sewoong Oh, M.D.'s National Provider Identifier (NPI) is 1083840458, issued on May 30, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Frederick Sewoong Oh, M.D. located?
The NPPES record lists a practice address at 12 Camino Encinas, Orinda, CA, 94563. Phone: (510) 204-8180. Providers update this record themselves, so call before visiting.
How can I verify Frederick Sewoong Oh, M.D.'s license?
NPPES lists California license number A118307, 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 Frederick Sewoong Oh, M.D. prescribe under Medicare Part D?
In 2024, Frederick Sewoong Oh, M.D. had 204 Medicare Part D claims for 184 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.