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DR. MAZEN NAJJAR M.D.
NPI 1245342393
Internal Medicine - Infectious Disease in Grand Blanc, MI

Active since August 31, 2006PECOS EnrolledAccepts Medicare Assignment
4644 GENESYS PKWY, GRAND BLANC, MI 48439(810) 606-7125(810) 606-7131 Get Directions Write a Review

NPPES record last updated: October 5, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Mazen Najjar M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MAZEN NAJJAR M.D. (NPI 1245342393) is an individual infectious disease provider in Grand Blanc, Michigan, licensed in Michigan (4301087544) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Memorial Healthcare, and is a graduate of Other (1991).

NPPES Registry Identity

NPI1245342393
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. MAZEN NAJJARCredential: M.D.
Location Address4644 GENESYS PKWYGrand Blanc, MI 48439-8067
Mailing Address3495 S Center RdBurton, MI 48519-1455 · (810) 424-2007 · Fax (810) 743-1099
Phone(810) 606-7125
Fax(810) 606-7131
Sole ProprietorYes
Medical School CMSOtherGraduated 1991
Enumeration DateAugust 31, 2006
Last NPPES UpdateOctober 5, 2007
✔ NPI 1245342393 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in MI · 4301087544
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
Also ListedInternal MedicineTaxonomy 207R00000X · License 4301087544 (MI)
4644 GENESYS PKWY, Grand Blanc, MI 48439
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Other Identifiers 1

Medicare UPINI23701MI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mazen Najjar M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9739138967
PECOS Enrollment IDI20061114000339
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
1,733 services315 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
303 services275 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
139 services83 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
74 services42 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
45 services23 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
29 services29 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Memorial Healthcare

Acute Care Hospitals · Owosso, MI
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number230121
Location826 West King StreetOwosso, MI 48867 · Shiawassee County
Emergency services Birthing friendly

Mclaren Flint

Acute Care Hospitals · Flint, MI
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number230141
Location401 S Ballenger HighwayFlint, MI 48532 · Genesee County
Emergency services Birthing friendly

Ascension Genesys Hospital

Acute Care Hospitals · Grand Blanc, MI
3/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number230197
LocationOne Genesys ParkwayGrand Blanc, MI 48439 · Genesee County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 48439 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$126.15 typical visit price
range $54.34 – $166.68
Typical copayment $31.53 (range $13.58 – $41.67)
Most-billed visit code 99204
Established Patient
$96.44 typical visit price
range $17.09 – $135.40
Typical copayment $24.11 (range $4.27 – $33.85)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mazen Najjar's NPI number?

The NPI number for Mazen Najjar is 1245342393. It was assigned to this individual provider in the NPPES registry on August 31, 2006.

Where is Mazen Najjar located?

Mazen Najjar practices at 4644 Genesys Pkwy, Grand Blanc, MI 48439. The listed phone number is (810) 606-7125.

What is Mazen Najjar's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Mazen Najjar enrolled in Medicare?

Yes. Mazen Najjar is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Mazen Najjar accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, McLaren Health Plan Community and Priority Health and 1 other insurer list Mazen Najjar as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mazen Najjar affiliated with any hospitals?

According to CMS data, Mazen Najjar is affiliated with Memorial Healthcare, Mclaren Flint and Ascension Genesys Hospital.

When was this NPI record last updated?

The NPPES record for Mazen Najjar was last updated on October 5, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.