WILLIAM A GREGOIRE M.D.
NPI 1154343184
Radiology - Diagnostic Radiology in Baton Rouge, LA

Active since July 25, 2006PECOS EnrolledAccepts Medicare Assignment
5422 DIJON DR, BATON ROUGE, LA 70808(225) 769-9337 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About William A Gregoire M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM A GREGOIRE M.D. (NPI 1154343184) is an individual diagnostic radiology provider in Baton Rouge, Louisiana, licensed in Louisiana (11735R) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Baton Rouge General Medical Center, and is a graduate of Louisiana State University School Of Medicine In New Orleans (1991).

NPPES Registry Identity

NPI1154343184
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameWILLIAM A GREGOIRECredential: M.D.
Location Address5422 DIJON DRBaton Rouge, LA 70808-4315
Mailing AddressPo Box 14530Baton Rouge, LA 70898-4530 · (225) 769-6700
Sole ProprietorNo
Medical School CMSLouisiana State University School Of Medicine In New OrleansGraduated 1991
Enumeration DateJuly 25, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1154343184 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in LA · 11735R
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
5422 DIJON DR, Baton Rouge, LA 70808

Other Identifiers 3

Medicare ID-Type Unspecified5W789LA
Medicaid1678490LA
Medicare UPING27375

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

William A Gregoire M.d. 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.

PECOS PAC ID3779478755
PECOS Enrollment IDI20040218000709, I20171005003154
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

6

Medicare enrollment records show William Gregoire reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Diagnostic Radiology
5422 DIJON DR
Baton Rouge, LA 70808
  • Reassigned Medicare billing, Louisiana and Mississippi enrollments
  • 35 clinicians in this Medicare group
Internal Medicine
7373 PERKINS RD, ATTENTION: ADMINISTRATION
Baton Rouge, LA 70808
  • Reassigned Medicare billing, Louisiana enrollment
  • 371 clinicians in this Medicare group
Obstetrics
8595 PICARDY AVE, SUITE 320
Baton Rouge, LA 70809
  • Reassigned Medicare billing, Louisiana enrollment
  • 154 clinicians in this Medicare group
Internal Medicine
10310 THE GROVE BLVD
Baton Rouge, LA 70836
  • Reassigned Medicare billing, Louisiana enrollment
  • 4,559 clinicians in this Medicare group
Specialist
10101 PARK ROWE AVE, STE. 200
Baton Rouge, LA 70810
  • Reassigned Medicare billing, Louisiana enrollment
  • 101 clinicians in this Medicare group
Diagnostic Radiology
15790 PAUL VEGA MD DR, RADIOLOGY DEPARTMENT
Hammond, LA 70403
  • Reassigned Medicare billing, Louisiana enrollment
  • 62 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 74

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.

Injection, gadobutrol, 0.1 ml A9585
Gadobutrol is a contrast agent used during MRI scans to help provide clearer images. It's injected into your vein before the scan. This helps doctors to see certain areas more clearly for better diagnosis. It's generally safe with few side effects.
5,165 services63 patients
Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml Q9967
Low osmolar contrast material with 300-399 mg/ml iodine concentration is a diagnostic tool used in imaging procedures. It helps to enhance the visibility of specific areas in the body, aiding in accurate diagnosis. It's safe and generally well-tolerated by patients.
3,675 services45 patients
Injection, gadolinium-based magnetic resonance contrast agent, not otherwise specified (nos), per ml A9579
This is an MRI procedure where a gadolinium-based contrast agent is injected into your body. The agent enhances the images, making it easier to detect abnormalities. It's safe and side effects are rare. It's administered per milliliter as needed.
1,275 services85 patients
X-ray of chest, 1 view 71045
A chest X-ray, 1 view, is a quick, painless test that produces images of the structures within your chest, such as your heart, lungs, and blood vessels. It helps in diagnosing conditions like pneumonia, heart problems, or lung cancer. You'll stand in front of a machine that emits X-rays, which pass through your body to create the image.
487 services414 patients
Ct scan head or brain without contrast 70450
A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.
264 services251 patients
X-ray of chest, 2 views 71046
A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.
228 services217 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Baton Rouge General Medical Center

Acute Care Hospitals · Baton Rouge, LA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number190065
Location8585 Picardy AveBaton Rouge, LA 70809 · E. Baton Rouge County
Emergency services Birthing friendly

Ochsner Medical Center - Baton Rouge

Acute Care Hospitals · Baton Rouge, LA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number190202
Location17000 Medical Center DrBaton Rouge, LA 70816 · E. Baton Rouge County
Emergency services Birthing friendly

The Spine Hospital Of Louisiana

Acute Care Hospitals · Baton Rouge, LA
OwnershipPhysician
CMS Certification Number190266
Location10105 Park Row Circle, Suite 250Baton Rouge, LA 70810 · E. Baton Rouge County

Bolivar Medical Center

Acute Care Hospitals · Cleveland, MS
3/5 CMS rating
OwnershipProprietary
CMS Certification Number250093
Location901 E Sunflower RdCleveland, MS 38732 · Bolivar County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 70808 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$83.60 typical visit price
range $53.43 – $164.73
Typical copayment $20.90 (range $13.35 – $41.18)
Most-billed visit code 99203
Established Patient
$67.06 typical visit price
range $16.64 – $133.62
Typical copayment $16.76 (range $4.16 – $33.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 18

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808
Radiology (Diagnostic Radiology)
5422 DIJON DR
BATON ROUGE, LA 70808

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 William Gregoire's NPI number?

The NPI number for William Gregoire is 1154343184. It was assigned to this individual provider in the NPPES registry on July 25, 2006.

Where is William Gregoire located?

William Gregoire practices at 5422 Dijon Dr, Baton Rouge, LA 70808. The listed phone number is (225) 769-9337.

What is William Gregoire's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is William Gregoire enrolled in Medicare?

Yes. William Gregoire 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 William Gregoire's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Gregoire reassigns Medicare benefits to 6 organizations: Baton Rouge Radiology Group Inc (Baton Rouge, LA), Baton Rouge Clinic, A Medical Corporation (Baton Rouge, LA), Baton Rouge General Physicians, Inc. (Baton Rouge, LA), Ochsner Clinic LLC (Baton Rouge, LA), Neuromedical Center (Baton Rouge, LA) and 1 more organization, listed in the Medicare section above. 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 William Gregoire's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Gregoire accept?

Health plans from HMO Louisiana, Oscar Health Plan, Inc. and UnitedHealthcare list William Gregoire 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 William Gregoire affiliated with any hospitals?

According to CMS data, William Gregoire is affiliated with Baton Rouge General Medical Center, Ochsner Medical Center - Baton Rouge, The Spine Hospital Of Louisiana and Bolivar Medical Center.

When was this NPI record last updated?

The NPPES record for William Gregoire was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.