NPPES file of Aug 9, 2026

William Tsai D O INC in Upland, CA

This organization bills under NPI 1598876856, an organization record issued on Aug 31, 2006 with the primary taxonomy Family Medicine Physician. Each clinician who works there has their own NPI and license.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

Organization recordNPPES, Aug 2026
1598876856
Legal name
William Tsai D O INC
Entity
Type 2 · organization
Primary taxonomy
Family Medicine Physician 207Q00000X
Practice location
510 N 13TH AVE STE 101, Upland, CA 91786
Phone
909-985-8838
Enumerated
Aug 31, 2006
Record updated
Apr 24, 2024
Authorized official
Physician Owner (title as filed)
Public record from the NPPES NPI Registry (open it on CMS). An NPI identifies who bills; it is not a facility license.

2 clinicians CMS lists with William Tsai D O in Upland

  1. Dinh LaiFamily Nurse Practitioner1093123176
  2. William Tsai, DOFamily Medicine Physician1285620443

Source: CMS Doctors and Clinicians group affiliations, matched by practice name and city.

Checking an organization

  1. Confirm the business with the California secretary of state.
  2. Check the HHS-OIG exclusion list for the organization.
  3. Verify each clinician on their own record and the state license search.

Common questions

Is an organization NPI a license?

No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.

Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.