MAI-SIE CHAN, M.D., INC
NPI 1396441929
Clinic/Center - Primary Care in San Francisco, CA
About Mai-sie Chan, M.d., Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAI-SIE CHAN, M.D., INC (NPI 1396441929) is a healthcare organization registered as a primary care in San Francisco, California and active in the NPI registry since February 2023. The organization lists Mai-sie Chan, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mai-sie Chan, M.d., Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Mai-Sie Chan, M.D., Inc, 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 Mai-Sie Chan, M.D., Inc's NPI number?
The NPI number for Mai-Sie Chan, M.D., Inc is 1396441929. It was assigned to this organization in the NPPES registry on February 6, 2023.
Where is Mai-Sie Chan, M.D., Inc located?
Mai-Sie Chan, M.D., Inc is located at 929 Clay St Ste 303, San Francisco, CA 94108. The listed phone number is (415) 956-6633.
What is Mai-Sie Chan, M.D., Inc's specialty?
The primary specialty registered for this NPI is Clinic/Center, specializing in Primary Care, with taxonomy code 261QP2300X.
Is Mai-Sie Chan, M.D., Inc enrolled in Medicare?
Yes. Mai-Sie Chan, M.D., Inc is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mai-Sie Chan, M.D., Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Mai-Sie Chan, M.D., Inc. 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 Mai-Sie Chan, M.D., Inc was last updated on July 13, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Mai-Sie Chan, M.d., Inc · NPI 1396441929
Primary Care organization in San Francisco, California. Organization record, active in the CMS NPPES registry since February 6, 2023.
## Identity
- **NPI:** 1396441929 (Entity type: Organization)
- **Enumerated:** February 6, 2023
- **Primary specialty:** Clinic/Center - Primary Care · taxonomy 261QP2300X
- **Organization subpart:** No
- **Authorized official:** Mai-Sie Chan, OWNER
## Practice location
- **Address:** 929 CLAY ST STE 303, San Francisco, CA 94108-1570
- **Phone:** (415) 956-6633 · **Fax:** (415) 956-6638
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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:** July 13, 2023
- **Other identifiers:** Medicaid 00A833620 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1396441929) · Data from the CMS NPPES public registry.