ANN RENEE COLLIER MD
NPI 1891863411
Allergy & Immunology in Oak Brook, IL
About Ann Renee Collier Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ANN RENEE COLLIER MD (NPI 1891863411) is an individual allergy & immunology provider in Oak Brook, Illinois and active in the NPI registry since December 2006. She is enrolled in Medicare PECOS, is affiliated with Duke University Hospital, and is a graduate of Other (2001).
NPPES Registry Identity
Specialties & Licenses 2
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
Ann Renee Collier Md 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 Ann Collier reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Mooresville, NC 28117
- Reassigned Medicare billing, North Carolina enrollment
- 3,671 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.
Areas of Expertise CMS Part B claims 9
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Duke University Hospital
Acute Care Hospitals · Durham, NCOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OAK BROOK, IL 60523
OAK BROOK, IL 60523
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 Ann Collier's NPI number?
The NPI number for Ann Collier is 1891863411. It was assigned to this individual provider in the NPPES registry on December 1, 2006.
Where is Ann Collier located?
Ann Collier practices at 120 Oakbrook Ctr Suite 424, Oak Brook, IL 60523. The listed phone number is (630) 574-0460.
What is Ann Collier's specialty?
The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.
Is Ann Collier enrolled in Medicare?
Yes. Ann Collier 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 Ann Collier's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ann Collier reassigns Medicare benefits to Duke Health Integrated Practice, Inc. (Mooresville, NC). 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 Ann Collier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ann Collier accept?
Health plans from Ambetter from Absolute Total Care, Ambetter of North Carolina, Ambetter of Tennessee, Blue Cross and Blue Shield of NC and Cigna Healthcare list Ann Collier 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 Ann Collier affiliated with any hospitals?
According to CMS data, Ann Collier is affiliated with Duke University Hospital.
When was this NPI record last updated?
The NPPES record for Ann Collier was last updated on December 28, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Ann Renee Collier, MD · NPI 1891863411
Allergy & Immunology physician in Oak Brook, Illinois. Individual provider, active in the CMS NPPES registry since December 1, 2006.
## Identity
- **NPI:** 1891863411 (Entity type: Individual)
- **Enumerated:** December 1, 2006
- **Primary specialty:** Allergy & Immunology · taxonomy 207K00000X
- **Sole proprietor:** No
## Practice location
- **Address:** 120 OAKBROOK CTR, SUITE 424, Oak Brook, IL 60523-1806
- **Phone:** (630) 574-0460 · **Fax:** (630) 574-0470
## 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:** Duke Health Integrated Practice, Inc. (NPI 1760288633, Mooresville, NC), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2001
## Record status
- **NPPES last updated:** December 28, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1891863411) · Data from the CMS NPPES public registry.