Quick answers
- Which hospitals does Michael Chai work at?
- Medicare's official clinician data lists Michael Chai at 3 hospitals: Casa Colina Hospital, Pomona Valley Hospital Medical Center and San Antonio Regional Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael Chai see patients?
- Medicare's clinician data lists 4 practice locations, including Upland, CA, Pomona, CA and Rancho Cucamonga, CA. Call before your visit to confirm the address.
- What is Michael Chai's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Michael Chai accept Medicare assignment?
- Medicare's clinician data says Michael Chai may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Michael Chai offer telehealth?
- Medicare's clinician data says Michael Chai offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Michael Chai?
- (909) 920-6698, as listed in official Medicare / NPI Registry data.
- What is Michael Chai's NPI number?
- 1083748727. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael Chai works
Medicare's Facility Affiliation Data lists Michael Chai at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Casa Colina HospitalPomona, CA · Acute Care Hospital · CCN 050782
- Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · CCN 050231
- San Antonio Regional HospitalUpland, CA · Acute Care Hospital · CCN 050099
Practice locations
Addresses where Michael Chai is enrolled with Medicare (CMS data updated 2026-10-02).
- 1113 Alta Ave, Suite 106Upland, CA 91786 (909) 920‑6698
- 255 E Bonita AvePomona, CA 91767 (909) 596‑7733
- 8816 Foothill BlvdRancho Cucamonga, CA 91730
- 900 E Harrison AvePomona, CA 91767 (909) 624‑5061
Group practices
Medicare enrollment lists Michael Chai as a member of this group (CMS data updated 2026-10-02).
- Congregational Homes17 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Upland
Clinicians with the same Medicare primary specialty in Upland, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Eastern Virginia Medical School |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1083748727 |
| 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