Michael Chai, M.D.
NPI 1083748727ActiveIndividual· Internal Medicine· Upland, CA
Internal Medicine (M.D.) in Upland, California, trained at Eastern Virginia Medical School (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $877,991 for 8,231 claims, against $156,443 paid for services in 2024. Sanofi-Aventis U.S. LLC was the largest of 18 companies reporting payments in 2025, $1,180 in all, mostly food and beverage.
Overview
| NPI | 1083748727 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Mar 15, 2007 |
| Last updated in NPPES | Nov 20, 2023 |
| Certified by provider | Nov 20, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G79965 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 337 |
|---|---|
| Services billed | 2,196 across 42 procedure codes |
| Paid by Medicare | $156,443 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,231 · 15,821 30-day fills |
|---|---|
| Patients | 362 |
| Total drug cost | $877,991 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | Eastern Virginia Medical School |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Congregational HomesPomona, CA · 17 clinicians
Hospital affiliations
- Casa Colina HospitalPomona, CA
- Pomona Valley Hospital Medical CenterPomona, CA
- San Antonio Regional HospitalUpland, CA
Other facilities
- Brio Home Health Services, IncHome health agency · Chino, CA
- Good Hope Home HealthHome health agency · Upland, CA
Industry payments (Open Payments)
- 2025$1,180 · 38 payments from 18 companies
- 2024$1,024 · 41 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sanofi-Aventis U.S. LLC | $189.64 | 3 |
| Abbvie Inc. | $144.59 | 2 |
| Ascendis Pharma Endocrinology Inc | $124.99 | 1 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $111.72 | 6 |
| Lilly USA, LLC | $102.50 | 5 |
What the 2025 payments were for
- Food and Beverage$1,180 · 38 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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