Dean Chang, MD
NPI 1770564247ActiveIndividual· Internal Medicine, Gastroenterology· Hamden, CT
Internal Medicine, Gastroenterology (MD) in Hamden, Connecticut, trained at University of Michigan Medical School (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $598,461 for 1,216 claims, against $92,867 paid for services in 2024. Abbvie Inc. was the largest of 21 companies reporting payments in 2025, $4,070 in all, mostly food and beverage.
Overview
| NPI | 1770564247 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 10, 2005 |
| Last updated in NPPES | May 27, 2021 |
| Certified by provider | May 27, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 034043 | CT |
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 - Gastroenterology (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 256 |
|---|---|
| Services billed | 3,027 across 31 procedure codes |
| Paid by Medicare | $92,867 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,216 · 2,610 30-day fills |
|---|---|
| Patients | 289 |
| Total drug cost | $598,461 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | University of Michigan Medical School |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Hhc Physician Services PLLCHamden, CT · 132 clinicians
Hospital affiliations
- Midstate Medical CenterMeriden, CT
- Yale-New Haven HospitalNew Haven, CT
Industry payments (Open Payments)
- 2025$4,070 · 152 payments from 21 companies
- 2024$3,034 · 130 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $892.88 | 40 |
| Madrigal Pharmaceuticals | $805.27 | 25 |
| Gilead Sciences, Inc. | $555.22 | 30 |
| Janssen Biotech, Inc. | $324.82 | 5 |
| Ardelyx, Inc. | $310.97 | 9 |
What the 2025 payments were for
- Food and Beverage$4,070 · 152 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 21 gastroenterologists in Hamden · All gastroenterologists in Connecticut