Michael G. Gregory, MD
NPI 1265457675ActiveIndividual· Internal Medicine· Brookline, MA
Internal Medicine (MD) with Massachusetts General Physicians Organization Inc, practicing in Brookline, Massachusetts. In 2024 Medicare paid $87,568 for 107 patients, and Part D covered 240 of their prescriptions, 78% of them generic. Lexicon Pharmaceuticals, Inc. reported $54.97 in payments in 2025, mostly food and beverage. Lists Beth Israel Deaconess Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1265457675 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 13, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MA208255 | 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 | 107 |
|---|---|
| Services billed | 979 across 11 procedure codes |
| Paid by Medicare | $87,568 |
Part D prescriptions in 2024
| Prescriptions (claims) | 240 · 263 30-day fills |
|---|---|
| Patients | 29 |
| Total drug cost | $35,272 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine, Hospice/Palliative Care |
Medical group
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
Hospital affiliations
- Beth Israel Deaconess Medical CenterBoston, MA
- Brigham and Women's HospitalBoston, MA
- Massachusetts General HospitalBoston, MA
- North Shore Medical Center -Salem, MA
Other facilities
- Spaulding Hospital for Continuing Med Care-CambLong-term care hospital · Cambridge, MA
Industry payments (Open Payments)
- 2025$54.97 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lexicon Pharmaceuticals, Inc. | $54.97 | 1 |
What the 2025 payments were for
- Food and Beverage$54.97 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 71 internal medicine physicians in Brookline · All internal medicine physicians in Massachusetts