John Leung, M.D.
NPI 1447328711ActiveIndividual· Internal Medicine, Gastroenterology· Boston, MA
Internal Medicine, Gastroenterology (M.D.) in Boston, Massachusetts, trained at University of Michigan Medical School (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $689,823 for 630 claims, against $38,508 paid for services in 2024. Genzyme Corporation was the largest of 34 companies reporting payments in 2025, $260,759 in all, mostly speaking and faculty fees.
Overview
| NPI | 1447328711 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 2, 2006 |
| Last updated in NPPES | Jul 28, 2022 |
| Certified by provider | Jul 28, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 230907 | MA |
| Allergy & Immunology, Clinical & Laboratory Immunology | 207KI0005X | 230907 | MA |
| Allergy & Immunology | 207K00000X | 230907 | MA |
| Internal Medicine | 207R00000X | 230907 | MA |
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 - Gastroenterology (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 136 |
|---|---|
| Services billed | 1,449 across 26 procedure codes |
| Paid by Medicare | $38,508 |
Part D prescriptions in 2024
| Prescriptions (claims) | 630 · 841 30-day fills |
|---|---|
| Patients | 114 |
| Total drug cost | $689,823 |
| Generic share | 69% of claims |
Education and affiliations
| Medical school | University of Michigan Medical School |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Allergy/Immunology |
| Telehealth | Offers telehealth |
Medical group
- Boston Food Allergy Center LLC Bi NetworkBoston, MA · 4 clinicians
Hospital affiliation
- Beth Israel Deaconess Hospital - NeedhamNeedham, MA
Industry payments (Open Payments)
- 2025$260,759 · 429 payments from 34 companies
- 2024$157,619 · 309 payments from 28 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $103,360 | 52 |
| Regeneron Healthcare Solutions, Inc. | $82,352 | 67 |
| Abbvie Inc. | $27,683 | 54 |
| Takeda Pharmaceuticals U.S.A., Inc. | $26,262 | 35 |
| Regeneron Pharmaceuticals, Inc. | $10,428 | 4 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$194,244 · 46 payments
- Consulting Fee$33,701 · 7 payments
- Travel and Lodging$23,805 · 49 payments
- Food and Beverage$8,990 · 325 payments
- Education$19.19 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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