STEWART FONG MD
NPI 1659459436
Internal Medicine in Oakland, CA
About Stewart Fong Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEWART FONG MD (NPI 1659459436) is an individual internal medicine provider in Oakland, California, licensed in California (G51405) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, Irvine, California College Of Medicine (1982).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
Stewart Fong Md 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 Stewart Fong reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oakland, CA 94607
- Reassigned Medicare billing, California enrollment
- 130 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
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 94607 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES
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 Stewart Fong's NPI number?
The NPI number for Stewart Fong is 1659459436. It was assigned to this individual provider in the NPPES registry on November 1, 2006.
Where is Stewart Fong located?
Stewart Fong practices at 835 Webster Street, Oakland, CA 94607. The listed phone number is (510) 318-5800.
What is Stewart Fong's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Stewart Fong enrolled in Medicare?
Yes. Stewart Fong 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 Stewart Fong's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stewart Fong reassigns Medicare benefits to Asian Health Services (Oakland, 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 Stewart Fong'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 Stewart Fong was last updated on January 12, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Stewart Fong, MD · NPI 1659459436
Internal Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since November 1, 2006.
## Identity
- **NPI:** 1659459436 (Entity type: Individual)
- **Enumerated:** November 1, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** G51405 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 835 WEBSTER STREET, Oakland, CA 94607
- **Phone:** (510) 318-5800 · **Fax:** (510) 986-8681
## 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:** Asian Health Services (NPI 1689744179, Oakland, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Irvine, California College Of Medicine, class of 1982
## Record status
- **NPPES last updated:** January 12, 2017
- **Other identifiers:** Medicare ID-Type Unspecified 00G514050; Medicaid 00G514050 (CA); Medicare UPIN F16580
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Source: [NPI Profile](https://npiprofile.com/npi/1659459436) · Data from the CMS NPPES public registry.