CLAYTON CHAN MD
NPI 1972682037
Internal Medicine in Oakland, CA
About Clayton Chan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CLAYTON CHAN MD (NPI 1972682037) is an individual internal medicine provider in Oakland, California, licensed in California (A68139) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of New York Medical College (1997).
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
Clayton Chan 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 Clayton Chan 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.
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.
Referred Medical Equipment & Supplies CMS DME claims 3
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 Clayton Chan's NPI number?
The NPI number for Clayton Chan is 1972682037. It was assigned to this individual provider in the NPPES registry on November 2, 2006.
Where is Clayton Chan located?
Clayton Chan practices at 818 Webster St, Oakland, CA 94607. The listed phone number is (510) 986-6830.
What is Clayton Chan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Clayton Chan enrolled in Medicare?
Yes. Clayton Chan 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 Clayton Chan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Clayton Chan 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 Clayton Chan'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 Clayton Chan was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Clayton Chan, MD · NPI 1972682037
Internal Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since November 2, 2006.
## Identity
- **NPI:** 1972682037 (Entity type: Individual)
- **Enumerated:** November 2, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A68139 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 818 WEBSTER ST, Oakland, CA 94607-4220
- **Phone:** (510) 986-6830 · **Fax:** (510) 986-6890
## 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 1841331402, Oakland, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York Medical College, class of 1997
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1972682037) · Data from the CMS NPPES public registry.