Mazen Najjar, M.D.
NPI 1245342393ActiveIndividual· Internal Medicine, Infectious Disease· Grand Blanc, MI
Internal Medicine, Infectious Disease (M.D.) with Najjar Infectious Disease PC, practicing in Grand Blanc, Michigan. Their prescriptions cost Medicare Part D more than their services did: $1,015,737 for 1,159 claims, against $160,073 paid for services in 2024. Abbvie Inc. was the largest of 7 companies reporting payments in 2025, $732.25 in all, mostly food and beverage. Lists Ascension Genesys Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1245342393 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 31, 2006 |
| Last updated in NPPES | Oct 5, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | 4301087544 | MI |
| Internal Medicine | 207R00000X | 4301087544 | MI |
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 - Infectious Disease (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 454 |
|---|---|
| Services billed | 2,352 across 12 procedure codes |
| Paid by Medicare | $160,073 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,159 · 1,240 30-day fills |
|---|---|
| Patients | 195 |
| Total drug cost | $1,015,737 |
| Generic share | 79% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Infectious Disease |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Najjar Infectious Disease PCFlint, MI · 2 clinicians
Hospital affiliations
- Ascension Genesys HospitalGrand Blanc, MI
- McLaren FlintFlint, MI
- Memorial HealthcareOwosso, MI
Other facilities
- McLaren Home HealthHome health agency · Davison, MI
Industry payments (Open Payments)
- 2025$732.25 · 39 payments from 7 companies
- 2024$515.05 · 32 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $286.03 | 16 |
| Gilead Sciences, Inc. | $234.70 | 12 |
| Merck Sharp & Dohme LLC | $100.95 | 5 |
| Insmed, Inc. | $56.62 | 3 |
| Aimmune Therapeutics, Inc. | $19.70 | 1 |
What the 2025 payments were for
- Food and Beverage$732.25 · 39 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other infectious disease specialists in Grand Blanc
- 1124130539
- 1760901003