Alvin Chang, M.D.
NPI 1396857181ActiveIndividual· Internal Medicine, Geriatric Medicine· Tustin, CA
Internal Medicine, Geriatric Medicine (M.D.) in Tustin, California, trained at University of California, Geffen School of Medicine (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $2,756,161 for 24,706 claims, against $162,126 paid for services in 2024. Corcept Therapeutics was the largest of 19 companies reporting payments in 2025, $1,526 in all, mostly food and beverage.
Overview
| NPI | 1396857181 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 31, 2006 |
| Last updated in NPPES | Sep 19, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | A55330 | 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 | 754 |
|---|---|
| Services billed | 2,521 across 39 procedure codes |
| Paid by Medicare | $162,126 |
Part D prescriptions in 2024
| Prescriptions (claims) | 24,706 · 36,131 30-day fills |
|---|---|
| Patients | 1,230 |
| Total drug cost | $2,756,161 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
| Telehealth | Offers telehealth |
Medical group
- Access Community Health CenterSanta Ana, CA · 28 clinicians
Hospital affiliations
- Chapman Global Medical CenterOrange, CA
- Foothill Regional Medical CenterTustin, CA
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
Other facilities
- Accu - Rite Health Services, IncHome health agency · Glendora, CA
- Apex Home Health Care ServicesHome health agency · Santa Ana, CA
- Genezen Home Health Care Services, IncHome health agency · Mission Viejo, CA
- Legacy Home Health, IncHome health agency · Rancho Cucamonga, CA
- Marvelle Home Health CareHome health agency · Anaheim, CA
- Apex Hospice Care, IncHospice · Santa Ana, CA
- Leisure Court Nursing CenterNursing home · Anaheim, CA
- Plaza Healthcare CenterNursing home · Santa Ana, CA
- Regents Point - WindcrestNursing home · Irvine, CA
Industry payments (Open Payments)
- 2025$1,526 · 63 payments from 19 companies
- 2024$513.05 · 23 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $392.03 | 11 |
| Teva Pharmaceuticals USA, Inc. | $213.82 | 10 |
| Vanda Pharmaceuticals Inc. | $174.40 | 7 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $90.57 | 4 |
| Neurocrine Biosciences, Inc. | $89.68 | 4 |
What the 2025 payments were for
- Food and Beverage$1,526 · 63 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Geriatric Medicine providers in Tustin
- 1851531768
All Internal Medicine, Geriatric Medicine providers in California →