Alexander A. Chang, M.D.
NPI 1225356231ActiveIndividual· Internal Medicine· San Francisco, CA
Internal Medicine (M.D.) with Truelight Medical Corporation, practicing in San Francisco, California. Their prescriptions cost Medicare Part D more than their services did: $723,011 for 5,297 claims, against $77,392 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 5 companies reporting payments in 2025, $334.73 in all, mostly food and beverage. Lists California Pacific Medical Center- Van Ness Campus and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1225356231 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 14, 2010 |
| Last updated in NPPES | Jul 27, 2023 |
| Certified by provider | Jul 27, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A127376 | CA |
| Pediatrics | 208000000X | A127376 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 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 | 165 |
|---|---|
| Services billed | 1,073 across 37 procedure codes |
| Paid by Medicare | $77,392 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,297 · 13,186 30-day fills |
|---|---|
| Patients | 400 |
| Total drug cost | $723,011 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
| Telehealth | Offers telehealth |
Medical group
- Truelight Medical CorporationSan Francisco, CA · 3 clinicians
Hospital affiliations
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- Chinese HospitalSan Francisco, CA
- UCSF Health Saint Francis HospitalSan Francisco, CA
- UCSF Health St. Mary's HospitalSan Francisco, CA
- UCSF Medical CenterSan Francisco, CA
Other facilities
- Alphacare Home HealthHome health agency · San Bruno, CA
- Health Link Home Health AgencyHome health agency · San Francisco, CA
- Healthflex Home Health ServicesHome health agency · Oakland, CA
- Sutter Care at HomeHome health agency · San Francisco, CA
Industry payments (Open Payments)
- 2025$334.73 · 15 payments from 5 companies
- 2024$352.68 · 12 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $205.12 | 10 |
| Lilly USA, LLC | $53.73 | 2 |
| Exact Sciences Corporation | $31.26 | 1 |
| Edwards Lifesciences Corporation | $27.83 | 1 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $16.79 | 1 |
What the 2025 payments were for
- Food and Beverage$334.73 · 15 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 1,457 internal medicine physicians in San Francisco · All internal medicine physicians in California