MARIEL ANN HAJJAR FNP-BC
NPI 1790508828
Nurse Practitioner in Ann Arbor, MI
About Mariel Ann Hajjar Fnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIEL ANN HAJJAR FNP-BC (NPI 1790508828) is an individual nurse practitioner in Ann Arbor, Michigan, licensed in Michigan (4704364622) and active in the NPI registry since November 2024. She is enrolled in Medicare PECOS, is affiliated with Beaumont Hospital - Dearborn, and is a graduate of Other (2024).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mariel Ann Hajjar Fnp-bc 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.
Medicare Billing Reassignment
Medicare enrollment records show Mariel Hajjar reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Dearborn, MI 48124
- Reassigned Medicare billing, Michigan enrollment
- 14 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Beaumont Hospital - Dearborn
Acute Care Hospitals · Dearborn, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 48109 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
ANN ARBOR, MI 48109
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 Mariel Hajjar's NPI number?
The NPI number for Mariel Hajjar is 1790508828. It was assigned to this individual provider in the NPPES registry on November 6, 2024.
Where is Mariel Hajjar located?
Mariel Hajjar practices at 426 N Ingalls St, Ann Arbor, MI 48109. The listed phone number is (734) 763-5985.
What is Mariel Hajjar's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Mariel Hajjar enrolled in Medicare?
Yes. Mariel Hajjar 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.
Which organization bills Medicare for Mariel Hajjar's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mariel Hajjar reassigns Medicare benefits to Danny Kewson M.D. P.C (Dearborn, MI). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mariel Hajjar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mariel Hajjar accept?
Health plans from Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Priority Health and UnitedHealthcare list Mariel Hajjar 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 Mariel Hajjar affiliated with any hospitals?
According to CMS data, Mariel Hajjar is affiliated with Beaumont Hospital - Dearborn.
When was this NPI record last updated?
The NPPES record for Mariel Hajjar was last updated on November 6, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 months 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.
# Mariel Ann Hajjar, FNP-BC · NPI 1790508828
Nurse Practitioner physician in Ann Arbor, Michigan. Individual provider, active in the CMS NPPES registry since November 6, 2024.
## Identity
- **NPI:** 1790508828 (Entity type: Individual)
- **Enumerated:** November 6, 2024
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 4704364622 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 426 N INGALLS ST, Ann Arbor, MI 48109-2003
- **Phone:** (734) 763-5985
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Danny Kewson M.D. P.C (NPI 1336362722, Dearborn, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2024
## Record status
- **NPPES last updated:** November 6, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1790508828) · Data from the CMS NPPES public registry.