ALLISON MARIE DIEM CRNP
NPI 1699901538
Nurse Practitioner - Family in Bel Air, MD
About Allison Marie Diem Crnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALLISON MARIE DIEM CRNP (NPI 1699901538) is an individual family provider in Bel Air, Maryland, licensed in Maryland (R173526) and active in the NPI registry since June 2009. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Allison Marie Diem Crnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Allison Diem reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bel Air, MD 21014
- Reassigned Medicare billing, Maryland enrollment
- 39 clinicians in this Medicare group
Baltimore, MD 21239
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 3,530 clinicians in this Medicare group
Baltimore, MD 21218
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 482 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21014 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.
BEL AIR, MD 21014
BEL AIR, MD 21014
BEL AIR, MD 21014
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 Allison Diem's NPI number?
The NPI number for Allison Diem is 1699901538. It was assigned to this individual provider in the NPPES registry on June 5, 2009. The provider is also known as Allison Marie Rye Crnp.
Where is Allison Diem located?
Allison Diem practices at 615 W Macphail Rd, Bel Air, MD 21014. The listed phone number is (410) 638-8900.
What is Allison Diem's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Allison Diem enrolled in Medicare?
Yes. Allison Diem is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Allison Diem's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Allison Diem reassigns Medicare benefits to 3 organizations: Harford Primary Care LLC (Bel Air, MD), Medstar Medical Group II LLC (Baltimore, MD) and Medstar Medical Group Anesthesiology LLC (Baltimore, MD). 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 Allison Diem's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Allison Diem was last updated on May 27, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Allison Marie Diem, CRNP · NPI 1699901538
Family physician in Bel Air, Maryland. Individual provider, active in the CMS NPPES registry since June 5, 2009.
## Identity
- **NPI:** 1699901538 (Entity type: Individual)
- **Enumerated:** June 5, 2009
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** R173526 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 615 W MACPHAIL RD, Bel Air, MD 21014-4309
- **Phone:** (410) 638-8900
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Harford Primary Care LLC (NPI 1194797670, Bel Air, MD); Medstar Medical Group II LLC (NPI 1184046187, Baltimore, MD); Medstar Medical Group Anesthesiology LLC (NPI 1528578333, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 27, 2014
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Source: [NPI Profile](https://npiprofile.com/npi/1699901538) · Data from the CMS NPPES public registry.