James Whitney Diamantopoulos, PA-C
NPI 1871225904ActiveIndividual· Physician Assistant· Brighton, MA
Physician Assistant (PA-C) with Atrius Health Inc, practicing in Brighton, Massachusetts. Their prescriptions cost Medicare Part D more than their services did: $419,566 for 472 claims, against $171,087 paid for services in 2024. Amgen Inc. was the largest of 12 companies reporting payments in 2025, $1,742 in all, mostly food and beverage.
Overview
| NPI | 1871225904 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Jun 28, 2022 |
| Last updated in NPPES | May 5, 2023 |
| Certified by provider | May 5, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA8861 | 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 - Physician Assistant (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 682 |
|---|---|
| Services billed | 5,320 across 39 procedure codes |
| Paid by Medicare | $171,087 |
Part D prescriptions in 2024
| Prescriptions (claims) | 472 · 512 30-day fills |
|---|---|
| Patients | 214 |
| Total drug cost | $419,566 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 2022 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Atrius Health IncBraintree, MA · 1,222 clinicians
Industry payments (Open Payments)
- 2025$1,742 · 57 payments from 12 companies
- 2024$2,871 · 130 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $424.73 | 6 |
| Abbvie Inc. | $204.70 | 18 |
| Sun Pharmaceutical Industries Inc. | $195.91 | 2 |
| Leo Pharma Inc. | $144.07 | 1 |
| E.R. Squibb & Sons, L.L.C. | $140.52 | 6 |
What the 2025 payments were for
- Food and Beverage$1,677 · 56 payments
- Education$64.95 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 51 physician assistants in Brighton · All physician assistants in Massachusetts