Doctor profile · Federal record
Dr. Mazen Najjar, M.D.
Infectious Disease Physician (CMS: Infectious Disease) · Internal Medicine Physician · Grand Blanc, MI
- NPI 1245342393
- Accepts Medicare
- 35 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
4644 Genesys Pkwy
Grand Blanc, MI 484398067
(810) 606-7125
fax (810) 606-7131 - Mailing address
-
3495 S Center RD
Burton, MI 485191455
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- October 5, 2007
- Year of graduation
- 1991 — 35 yrs since
- Specialty taxonomy
- 207RI0200X — NUCC code
- State license (1)
- Michigan #4301087544
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1245342393. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,222
Distinct HCPCS
7
Medicare allowed
$272,492
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 2,398 | 396 | $76 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 444 | 395 | $126 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 171 | 59 | $48 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 115 | 71 | $111 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 62 | 42 | $115 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 18 | 17 | $168 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 14 | 14 | $148 |
In context: peer comparison
Among 2 peers in Grand Blanc Infectious Disease Physician, average services per provider: 23,003. This provider delivers 0.1× the peer median.Open Payments
Industry payments received
All-time total
$515
Transactions
32
Manufacturers
7
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 12 | $155.66 | |
| Gilead Sciences, INC. | 7 | $115.11 | |
| Merck Sharp & Dohme LLC | 4 | $88.42 | |
| ViiV Healthcare Company | 4 | $61.46 | |
| Aimmune Therapeutics, INC. | 3 | $60.36 | |
| Insmed, INC. | 1 | $17.93 | |
| Melinta Therapeutics, LLC | 1 | $16.11 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
559
Patients
129
Total drug cost
$439,030
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Biktarvy (Bictegrav/Emtricit/Tenofov Ala) | Brand | 80 | 0 | $343,847 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 64 | 33 | $1,294 |
| Vancomycin Hcl | Generic | 54 | 15 | $4,636 |
| Ceftriaxone (Ceftriaxone Sodium) | Brand | 44 | 0 | $2,581 |
| Ampicillin-Sulbactam (Ampicillin Sod/Sulbactam Sod) | Brand | 39 | 0 | $7,033 |
| Cefazolin Sodium | Generic | 39 | 12 | $1,839 |
| Ciprofloxacin Hcl | Generic | 39 | 19 | $225 |
| Meropenem | Generic | 32 | 0 | $5,596 |
| Cephalexin | Generic | 31 | 13 | $419 |
| Sulfamethoxazole-Trimethoprim (Sulfamethoxazole/Trimethoprim) | Brand | 25 | 12 | $367 |
Hospital affiliations
Frequently asked questions
What is Dr. Mazen Najjar's medical specialty?
Dr. Mazen Najjar practices Infectious Disease Physician in Grand Blanc, MI.
Where does Dr. Mazen Najjar practice?
Dr. Mazen Najjar practices at 4644 Genesys Pkwy, Grand Blanc, MI 484398067. Office phone: 8106067125.
What is Dr. Mazen Najjar's NPI?
Dr. Mazen Najjar's National Provider Identifier (NPI) is 1245342393, issued by NPPES.
Does Dr. Mazen Najjar accept Medicare assignment?
Yes. Dr. Mazen Najjar accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mazen Najjar commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Initial hospital care with straightforward or low-level medical decision making (HCPCS 99222); Subsequent hospital care with straightforward or low level of medical decision making (HCPCS 99231). Source: CMS Medicare Physician & Other Practitioners file.