Alan Chang, M.D.
NPI 1649408675ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· East Setauket, NY
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with Stony Brook Internists University Faculty Practice Corporation, practicing in East Setauket, New York. Their prescriptions cost Medicare Part D more than their services did: $1,189,972 for 2,290 claims, against $106,472 paid for services in 2024. Beta Bionics, Inc. was the largest of 9 companies reporting payments in 2025, $1,219 in all, mostly food and beverage. Lists Suny/Stony Brook University Hospital as a hospital affiliation.
Overview
| NPI | 1649408675 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 29, 2009 |
| Last updated in NPPES | Nov 4, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 301834 | NY |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | MD452043 | PA |
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 - Endocrinology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 464 |
|---|---|
| Services billed | 2,091 across 25 procedure codes |
| Paid by Medicare | $106,472 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,290 · 5,244 30-day fills |
|---|---|
| Patients | 293 |
| Total drug cost | $1,189,972 |
| Generic share | 46% of claims |
Education and affiliations
| Graduation year | 2009 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Stony Brook Internists University Faculty Practice CorporationStony Brook, NY · 428 clinicians
Hospital affiliation
- Suny/Stony Brook University HospitalStony Brook, NY
Industry payments (Open Payments)
- 2025$1,219 · 18 payments from 9 companies
- 2024$671.02 · 7 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Beta Bionics, Inc. | $369.14 | 3 |
| Medtronic, Inc. | $225.73 | 3 |
| Insulet Corporation | $225.37 | 3 |
| Dexcom, Inc. | $172.08 | 4 |
| Alexion Pharmaceuticals, Inc. | $126.75 | 1 |
What the 2025 payments were for
- Food and Beverage$1,219 · 18 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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