Quick answers
- Where does Thomas T. Ha see patients?
- Medicare's clinician data lists 2 practice locations, including Diamond Bar, CA and Covina, CA. Call before your visit to confirm the address.
- What is Thomas T. Ha's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Thomas T. Ha accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas T. Ha 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 Thomas T. Ha?
- (626) 858-5370, as listed in official Medicare / NPI Registry data.
- What is Thomas T. Ha's NPI number?
- 1568447860. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Thomas T. Ha is enrolled with Medicare (CMS data updated 2026-10-02).
- 23541 Ridge Line RdDiamond Bar, CA 91765
- 500 W Badillo StCovina, CA 91722 (626) 858‑5370
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Diamond Bar
Clinicians with the same Medicare primary specialty in Diamond Bar, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1975 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568447860 |
| 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
- 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