WILLIAM W CHEN MD MEDICAL CORPORATION
NPI 1942386180
Allergy & Immunology in San Pablo, CA
About William W Chen Md Medical Corporation NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM W CHEN MD MEDICAL CORPORATION (NPI 1942386180) is a healthcare organization registered as an allergy & immunology in San Pablo, California and active in the NPI registry since October 2006. The organization lists William Wei Ming Chen, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
William W Chen Md Medical Corporation is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by January 31, 2027
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to William W Chen MD Medical Corporation, which bills Medicare for the services this clinician delivers.
Clinician (1)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 William W Chen MD Medical Corporation's NPI number?
The NPI number for William W Chen MD Medical Corporation is 1942386180. It was assigned to this organization in the NPPES registry on October 31, 2006.
Where is William W Chen MD Medical Corporation located?
William W Chen MD Medical Corporation is located at 2089 Vale Rd # 34, San Pablo, CA 94806. The listed phone number is (510) 235-9247.
What is William W Chen MD Medical Corporation's specialty?
The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.
Is William W Chen MD Medical Corporation enrolled in Medicare?
Yes. William W Chen MD Medical Corporation is registered in the Medicare PECOS enrollment system.
When is William W Chen MD Medical Corporation's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by January 31, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through William W Chen MD Medical Corporation?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to William W Chen MD Medical Corporation. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for William W Chen MD Medical Corporation was last updated on August 23, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# William W Chen Md Medical Corporation · NPI 1942386180
Allergy & Immunology organization in San Pablo, California. Organization record, active in the CMS NPPES registry since October 31, 2006.
## Identity
- **NPI:** 1942386180 (Entity type: Organization)
- **Enumerated:** October 31, 2006
- **Primary specialty:** Allergy & Immunology · taxonomy 207K00000X
- **Organization subpart:** No
- **Authorized official:** William Chen, PRESIDENT
## Practice location
- **Address:** 2089 VALE RD # 34, San Pablo, CA 94806
- **Phone:** (510) 235-9247 · **Fax:** (510) 235-9248
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** January 31, 2027 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 1 clinician (Internal Medicine) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 23, 2010
- **Other identifiers:** Medicare UPIN H71446; Medicaid 00A070200 (CA); Medicare ID-Type Unspecified ZZZ25764Z
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Source: [NPI Profile](https://npiprofile.com/npi/1942386180) · Data from the CMS NPPES public registry.