Gregory A. Johnson, MD
NPI 1942213509ActiveIndividual· Internal Medicine· Somerville, MA
Internal Medicine (MD) in Somerville, Massachusetts, trained at Warren Alpert Medical School of Brown University (class of 1993). 512 Medicare patients in 2024, $68,313 paid; nearly all of their 781 Part D prescriptions were generic (91%).
Overview
| NPI | 1942213509 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 14, 2006 |
| Last updated in NPPES | Feb 18, 2021 |
| Certified by provider | Feb 18, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 151587 | 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 | 512 |
|---|---|
| Services billed | 4,020 across 112 procedure codes |
| Paid by Medicare | $68,313 |
Part D prescriptions in 2024
| Prescriptions (claims) | 781 · 840 30-day fills |
|---|---|
| Patients | 577 |
| Total drug cost | $15,225 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | Warren Alpert Medical School of Brown University |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Internal Medicine |
Medical group
- Atrius Health IncBraintree, MA · 1,222 clinicians
Hospital affiliation
- Northeast Hospital CorporationBeverly, MA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 39 internal medicine physicians in Somerville · All internal medicine physicians in Massachusetts