Alan T. Chang, M.D.
NPI 1699784934ActiveIndividual· Internal Medicine· Escondido, CA
Internal Medicine (M.D.) in Escondido, California, trained at University of Southern California Keck School of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $1,102,952 for 13,850 claims, against $107,417 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 11 companies reporting payments in 2025, $756.50 in all, mostly food and beverage.
Overview
| NPI | 1699784934 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 5, 2006 |
| Last updated in NPPES | Dec 12, 2024 |
| Certified by provider | Dec 12, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G79904 | 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 | 339 |
|---|---|
| Services billed | 7,589 across 56 procedure codes |
| Paid by Medicare | $107,417 |
Part D prescriptions in 2024
| Prescriptions (claims) | 13,850 · 25,914 30-day fills |
|---|---|
| Patients | 790 |
| Total drug cost | $1,102,952 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Graybill Medical Group IncOceanside, CA · 104 clinicians
- Del Sur HealthcareEl Cajon, CA · 59 clinicians
Hospital affiliations
- Palomar Health Downtown CampusEscondido, CA
- Palomar Medical Center PowayPoway, CA
Other facilities
- Active Health ServicesHome health agency · San Diego, CA
- Archer Health IncHome health agency · Carlsbad, CA
- Mission Home Health of North County San DiegoHome health agency · San Marcos, CA
- Sea Coast Home Health Care IncHome health agency · San Diego, CA
- Bristol Hospice - San DiegoHospice · San Diego, CA
- Boulder Creek Post AcuteNursing home · Poway, CA
- Escondido Post AcuteNursing home · Escondido, CA
- Palomar Heights Post AcuteNursing home · Escondido, CA
Industry payments (Open Payments)
- 2025$756.50 · 31 payments from 11 companies
- 2024$816.98 · 38 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $141.81 | 7 |
| Astrazeneca Pharmaceuticals LP | $128.08 | 6 |
| Neurocrine Biosciences, Inc. | $121.84 | 1 |
| Lilly USA, LLC | $117.75 | 6 |
| Janssen Biotech, Inc. | $55.35 | 2 |
What the 2025 payments were for
- Food and Beverage$756.50 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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