MRS. MARGARET AIKINS KEUP APNP
NPI 1023417169
Nurse Practitioner - Acute Care in Grafton, WI
About Mrs. Margaret Aikins Keup Apnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. MARGARET AIKINS KEUP APNP (NPI 1023417169) is an individual acute care provider in Grafton, Wisconsin, licensed in Wisconsin (5585) and active in the NPI registry since August 2014. She is enrolled in Medicare PECOS, is affiliated with Ascension Columbia St Mary's Hospital Milwaukee, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses 3
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
Mrs. Margaret Aikins Keup Apnp 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
4Medicare enrollment records show Margaret Keup reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Glendale, WI 53212
- Reassigned Medicare billing, Wisconsin enrollment
- 1,343 clinicians in this Medicare group
Milwaukee, WI 53215
- Reassigned Medicare billing, Wisconsin enrollment
- 22 clinicians in this Medicare group
Mount Pleasant, WI 53405
- Reassigned Medicare billing, Wisconsin enrollment
- 72 clinicians in this Medicare group
Black River Falls, WI 54615
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1811940331 (Wisconsin)
- 227 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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ascension Columbia St Mary's Hospital Milwaukee
Acute Care Hospitals · Milwaukee, WIAscension All Saints Hospital
Acute Care Hospitals · Racine, WIAscension SE Wisconsin Hospital
Acute Care Hospitals · Milwaukee, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53024 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.
GRAFTON, WI 53024
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 Margaret Keup's NPI number?
The NPI number for Margaret Keup is 1023417169. It was assigned to this individual provider in the NPPES registry on August 14, 2014.
Where is Margaret Keup located?
Margaret Keup practices at 975 Port Washington Rd, Grafton, WI 53024. The listed phone number is (262) 329-1000.
What is Margaret Keup's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Acute Care, with taxonomy code 363LA2100X.
Is Margaret Keup enrolled in Medicare?
Yes. Margaret Keup 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 Margaret Keup's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Keup reassigns Medicare benefits to 4 organizations: Ascension Medical Group-Southeast Wisconsin Inc (Glendale, WI), Greater Milwaukee Critical Care And Pulmonary Associates Sc (Milwaukee, WI), Midwest Critical Care Sc (Mount Pleasant, WI) and Black River Health Inc (Black River Falls, WI). 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 Margaret Keup's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Keup accept?
Health plans from Dean Health Plan, Quartz, Security Health Plan and UnitedHealthcare list Margaret Keup 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 Margaret Keup affiliated with any hospitals?
According to CMS data, Margaret Keup is affiliated with Ascension Columbia St Mary's Hospital Milwaukee, Ascension All Saints Hospital and Ascension SE Wisconsin Hospital.
When was this NPI record last updated?
The NPPES record for Margaret Keup was last updated on March 3, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Mrs. Margaret Aikins Keup, APNP · NPI 1023417169
Acute Care physician in Grafton, Wisconsin. Individual provider, active in the CMS NPPES registry since August 14, 2014.
## Identity
- **NPI:** 1023417169 (Entity type: Individual)
- **Enumerated:** August 14, 2014
- **Primary specialty:** Nurse Practitioner - Acute Care · taxonomy 363LA2100X
- **State license:** 5585 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 975 PORT WASHINGTON RD, Grafton, WI 53024-9201
- **Phone:** (262) 329-1000
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Ascension Medical Group-Southeast Wisconsin Inc (NPI 1609881077, Glendale, WI); Greater Milwaukee Critical Care And Pulmonary Associates Sc (NPI 1952569816, Milwaukee, WI); Midwest Critical Care Sc (NPI 1093425647, Mount Pleasant, WI); Black River Health Inc (NPI 1003914011, Black River Falls, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** March 3, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1023417169) · Data from the CMS NPPES public registry.