MS. MARY ANN DIER - ZIMMERMANN L.C.P.C.
NPI 1336298306
Counselor - Professional in Bourbonnais, IL
About Ms. Mary Ann Dier - Zimmermann L.c.p.c. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. MARY ANN DIER - ZIMMERMANN L.C.P.C. (NPI 1336298306) is an individual professional provider in Bourbonnais, Illinois, licensed in Illinois (180-001433) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ms. Mary Ann Dier - Zimmermann L.c.p.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mary Dier - Zimmermann reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chicago, IL 60602
- Reassigned Medicare billing, Illinois enrollment
- 10 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.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOURBONNAIS, IL 60914
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 Mary Dier - Zimmermann's NPI number?
The NPI number for Mary Dier - Zimmermann is 1336298306. It was assigned to this individual provider in the NPPES registry on January 9, 2007.
Where is Mary Dier - Zimmermann located?
Mary Dier - Zimmermann practices at 201 Park Pl Ste 2, Bourbonnais, IL 60914. The listed phone number is (815) 573-1443.
What is Mary Dier - Zimmermann's specialty?
The primary specialty registered for this NPI is Counselor, specializing in Professional, with taxonomy code 101YP2500X.
Is Mary Dier - Zimmermann enrolled in Medicare?
Yes. Mary Dier - Zimmermann is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mary Dier - Zimmermann's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Dier - Zimmermann reassigns Medicare benefits to Perspectives Ltd (Chicago, IL). 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 Mary Dier - Zimmermann'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 Mary Dier - Zimmermann was last updated on July 25, 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.
# Ms. Mary Ann Dier - Zimmermann, L.C.P.C. · NPI 1336298306
Professional provider in Bourbonnais, Illinois. Individual provider, active in the CMS NPPES registry since January 9, 2007.
## Identity
- **NPI:** 1336298306 (Entity type: Individual)
- **Enumerated:** January 9, 2007
- **Primary specialty:** Counselor - Professional · taxonomy 101YP2500X
- **State license:** 180-001433 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 201 PARK PL STE 2, Bourbonnais, IL 60914-1883
- **Phone:** (815) 573-1443
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Perspectives Ltd (NPI 1750439444, Chicago, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 25, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1336298306) · Data from the CMS NPPES public registry.