FREDERICK SEWOONG OH M.D.
NPI 1083840458
Family Medicine in Orinda, CA
About Frederick Sewoong Oh M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
FREDERICK SEWOONG OH M.D. (NPI 1083840458) is an individual family medicine provider in Orinda, California, licensed in California (A118307) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS and is a graduate of Other (2007).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Frederick Sewoong Oh M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Frederick Oh reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Orinda, CA 94563
- Reassigned Medicare billing, California enrollment
- 4,479 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 9
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94563 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Frederick Oh's NPI number?
The NPI number for Frederick Oh is 1083840458. It was assigned to this individual provider in the NPPES registry on May 30, 2009.
Where is Frederick Oh located?
Frederick Oh practices at 12 Camino Encinas, Orinda, CA 94563. The listed phone number is (510) 204-8180.
What is Frederick Oh's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Frederick Oh enrolled in Medicare?
Yes. Frederick Oh is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Frederick Oh's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Frederick Oh reassigns Medicare benefits to Sutter Bay Medical Foundation (Orinda, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Frederick Oh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Frederick Oh was last updated on February 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Frederick Sewoong Oh, M.D. · NPI 1083840458
Family Medicine physician in Orinda, California. Individual provider, active in the CMS NPPES registry since May 30, 2009.
## Identity
- **NPI:** 1083840458 (Entity type: Individual)
- **Enumerated:** May 30, 2009
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** A118307 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 12 CAMINO ENCINAS, Orinda, CA 94563-3304
- **Phone:** (510) 204-8180
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Sutter Bay Medical Foundation (NPI 1366898538, Orinda, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2007
## Record status
- **NPPES last updated:** February 29, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1083840458) · Data from the CMS NPPES public registry.