Jack C. Chang, MD
NPI 1811182041ActiveIndividual· Internal Medicine· Lowell, MA
Internal Medicine (MD) in Lowell, Massachusetts, licensed in MA, with an NPI issued in September 2007. Their prescriptions cost Medicare Part D more than their services did: $975,600 for 6,709 claims, against $43,624 paid for services in 2024. Lilly USA, LLC was the largest of 2 companies reporting payments in 2025, $40.34 in all, mostly food and beverage. Lists Lowell General Hospital as a hospital affiliation.
Overview
| NPI | 1811182041 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 11, 2007 |
| Last updated in NPPES | Nov 26, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 74694 | MA |
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 (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 100 |
|---|---|
| Services billed | 544 across 28 procedure codes |
| Paid by Medicare | $43,624 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,709 · 15,042 30-day fills |
|---|---|
| Patients | 371 |
| Total drug cost | $975,600 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 1984 |
|---|---|
| Medicare specialty | Internal Medicine |
Hospital affiliation
- Lowell General HospitalLowell, MA
Other facilities
- Tufts Medicine Care at HomeHome health agency · Lowell, MA
Industry payments (Open Payments)
- 2025$40.34 · 2 payments from 2 companies
- 2024$51.49 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $21.06 | 1 |
| Glaxosmithkline, LLC. | $19.28 | 1 |
What the 2025 payments were for
- Food and Beverage$40.34 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 76 internal medicine physicians in Lowell · All internal medicine physicians in Massachusetts