Quick answers
- Which hospitals does Tat M. Lam work at?
- Medicare's official clinician data lists Tat M. Lam at 1 hospital: Providence St. Joseph Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Tat M. Lam see patients?
- Medicare's clinician data lists 7 practice locations, including Chino Hills, CA, Apple Valley, CA and Fullerton, CA. Call before your visit to confirm the address.
- What is Tat M. Lam's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Tat M. Lam accept Medicare assignment?
- Yes. Medicare's clinician data says Tat M. Lam accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Tat M. Lam?
- (909) 929-2511, as listed in official Medicare / NPI Registry data.
- What is Tat M. Lam's NPI number?
- 1134288749. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Tat M. Lam works
Medicare's Facility Affiliation Data lists Tat M. Lam at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence St. Joseph HospitalOrange, CA · Acute Care Hospital · CCN 050069
Practice locations
Addresses where Tat M. Lam is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 15855 Pomona Rincon Rd, Bldg 4Chino Hills, CA 91709 (909) 929‑2511
- 19333 Bear Valley RdApple Valley, CA 92308
- 1950 Sunny Crest Dr, Suite 2900Fullerton, CA 92835 (714) 992‑5350
- 2212 E 4th StSanta Ana, CA 92705 (714) 633‑1011
- 2501 E Chapman AveOrange, CA 92869 (714) 633‑7175
Group practices
Medicare enrollment lists Tat M. Lam as a member of this group (CMS data updated 2026-10-02).
- Providence Medical Foundation1,466 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Chino Hills
Clinicians with the same Medicare primary specialty in Chino Hills, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Southern California Keck School Of Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134288749 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians