MS. ABIGAIL ELIZABETH DIEFENBACH AGACNP-BC
NPI 1023856200
Nurse Practitioner - Acute Care in Dearborn, MI
About Ms. Abigail Elizabeth Diefenbach Agacnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. ABIGAIL ELIZABETH DIEFENBACH AGACNP-BC (NPI 1023856200) is an individual acute care provider in Dearborn, Michigan, licensed in Michigan (4704322332) and active in the NPI registry since July 2024. She is enrolled in Medicare PECOS, is affiliated with Beaumont Hospital - Dearborn, and maintains a secondary practice location in Madison Heights.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Location 1
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
Ms. Abigail Elizabeth Diefenbach Agacnp-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 Reassignments
2Medicare enrollment records show Abigail Diefenbach reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Royal Oak, MI 48073
- Reassigned Medicare billing, Michigan enrollment
- 946 clinicians in this Medicare group
Madison Heights, MI 48071
- Reassigned Medicare billing, Michigan enrollment
- 25 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 48124 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.
DEARBORN, MI 48124
DEARBORN, MI 48124
DEARBORN, MI 48124
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 Abigail Diefenbach's NPI number?
The NPI number for Abigail Diefenbach is 1023856200. It was assigned to this individual provider in the NPPES registry on July 19, 2024. The provider is also known as Abigail Elizabeth Rowan.
Where is Abigail Diefenbach located?
Abigail Diefenbach practices at 18101 Oakwood Blvd, Dearborn, MI 48124. The listed phone number is (313) 593-7000.
What is Abigail Diefenbach's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Acute Care, with taxonomy code 363LA2100X.
Is Abigail Diefenbach enrolled in Medicare?
Yes. Abigail Diefenbach 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 organizations bill Medicare for Abigail Diefenbach's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Abigail Diefenbach reassigns Medicare benefits to 2 organizations: Beaumont Medical Group Hospital -Based Services (Royal Oak, MI) and Seasons Medical Group Of Michigan, PC (Madison Heights, MI). Each 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 Abigail Diefenbach's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Abigail Diefenbach accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian and Priority Health list Abigail Diefenbach 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 Abigail Diefenbach affiliated with any hospitals?
According to CMS data, Abigail Diefenbach is affiliated with Beaumont Hospital - Dearborn.
When was this NPI record last updated?
The NPPES record for Abigail Diefenbach was last updated on March 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Ms. Abigail Elizabeth Diefenbach, AGACNP-BC · NPI 1023856200
Acute Care physician in Dearborn, Michigan. Individual provider, active in the CMS NPPES registry since July 19, 2024.
## Identity
- **NPI:** 1023856200 (Entity type: Individual)
- **Enumerated:** July 19, 2024
- **Primary specialty:** Nurse Practitioner - Acute Care · taxonomy 363LA2100X
- **State license:** 4704322332 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 18101 OAKWOOD BLVD, Dearborn, MI 48124-4089
- **Phone:** (313) 593-7000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Beaumont Medical Group Hospital -Based Services (NPI 1427567858, Royal Oak, MI); Seasons Medical Group Of Michigan, PC (NPI 1841551074, Madison Heights, MI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2024
## Record status
- **NPPES last updated:** March 16, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1023856200) · Data from the CMS NPPES public registry.