NATALIE MAHIEU MD
NPI 1184815011
Radiology - Diagnostic Radiology in Oak Lawn, IL
About Natalie Mahieu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NATALIE MAHIEU MD (NPI 1184815011) is an individual diagnostic radiology provider in Oak Lawn, Illinois, licensed in Louisiana (339666) and active in the NPI registry since August 2007. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 2
Other Identifiers 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 (PECOS)
Natalie Mahieu Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Natalie Mahieu reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 clinicians in this Medicare group
West Monroe, LA 71292
- Reassigned Medicare billing, Louisiana enrollment
- 4,559 clinicians in this Medicare group
Shreveport, LA 71103
- Reassigned Medicare billing, Louisiana enrollment
- 1,167 clinicians in this Medicare group
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
- 1,281 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 60453 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 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Natalie Mahieu's NPI number?
The NPI number for Natalie Mahieu is 1184815011. It was assigned to this individual provider in the NPPES registry on August 6, 2007.
Where is Natalie Mahieu located?
Natalie Mahieu practices at 4440 W 95th St Dept Of, Oak Lawn, IL 60453. The listed phone number is (708) 684-5503.
What is Natalie Mahieu's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Natalie Mahieu enrolled in Medicare?
Yes. Natalie Mahieu is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Natalie Mahieu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Natalie Mahieu reassigns Medicare benefits to 4 organizations: Advocate Health & Hospitals Corporation (Oak Lawn, IL), Ochsner Clinic LLC (West Monroe, LA), Lsu Health Sciences Center Shreveport Faculty Group Practice (Shreveport, LA) and Children's Hospital Los Angeles Medical Group, Inc. (Los Angeles, CA). 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 Natalie Mahieu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Natalie Mahieu accept?
Health plans from HMO Louisiana and Oscar Health list Natalie Mahieu 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.
When was this NPI record last updated?
The NPPES record for Natalie Mahieu was last updated on April 9, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Natalie Mahieu, MD · NPI 1184815011
Diagnostic Radiology physician in Oak Lawn, Illinois. Individual provider, active in the CMS NPPES registry since August 6, 2007.
## Identity
- **NPI:** 1184815011 (Entity type: Individual)
- **Enumerated:** August 6, 2007
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** 339666 (Louisiana)
- **Sole proprietor:** No
## Practice location
- **Address:** 4440 W 95TH ST DEPT OF, Oak Lawn, IL 60453-2600
- **Phone:** (708) 684-5503 · **Fax:** (708) 684-2675
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL); Ochsner Clinic LLC (NPI 1932598695, West Monroe, LA); Lsu Health Sciences Center Shreveport Faculty Group Practice (NPI 1013374222, Shreveport, LA); Children's Hospital Los Angeles Medical Group, Inc. (NPI 1265530653, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 9, 2025
- **Other identifiers:** Medicaid 1091065 (LA)
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Source: [NPI Profile](https://npiprofile.com/npi/1184815011) · Data from the CMS NPPES public registry.