Holly Ann Mazur, M.D.
NPI 1295780617ActiveIndividual· Internal Medicine· Acton, MA
Internal Medicine (M.D.) in Acton, Massachusetts, trained at Tufts University School of Medicine (class of 1992). Their prescriptions cost Medicare Part D more than their services did: $145,603 for 2,843 claims, against $53,571 paid for services in 2024. Viiv Healthcare Company was the largest of 5 companies reporting payments in 2025, $119.18 in all, mostly food and beverage.
Overview
| NPI | 1295780617 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 24, 2006 |
| Last updated in NPPES | Sep 16, 2026 |
| Certified by provider | Mar 30, 2023 |
| Reactivated | Sep 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 81939 | MA |
| Internal Medicine | 207R00000X | 61790 | CT |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 271 |
|---|---|
| Services billed | 1,767 across 103 procedure codes |
| Paid by Medicare | $53,571 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,843 · 7,164 30-day fills |
|---|---|
| Patients | 521 |
| Total drug cost | $145,603 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Internal Medicine |
Hospital affiliations
- Emerson Hospital -W Concord, MA
- Umass Memorial Healthalliance HospitalsLeominster, MA
- Umass Memorial Medical Center/University CampusWorcester, MA
Other facilities
- Health Alliance Home Health and HospiceHome health agency · Leominster, MA
Industry payments (Open Payments)
- 2025$119.18 · 5 payments from 5 companies
- 2024$15.85 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Viiv Healthcare Company | $31.76 | 1 |
| Astellas Pharma US Inc | $26.41 | 1 |
| Pfizer Inc. | $26.26 | 1 |
| Inspire Medical Systems, Inc. | $19.13 | 1 |
| Abbvie Inc. | $15.62 | 1 |
What the 2025 payments were for
- Food and Beverage$119.18 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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