GREGORY WILLIAM COTTER M.D.
NPI 1659363067
Radiology - Radiation Oncology in Baton Rouge, LA
About Gregory William Cotter M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREGORY WILLIAM COTTER M.D. (NPI 1659363067) is an individual radiation oncology provider in Baton Rouge, Louisiana, licensed in Louisiana (308265) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Riverland Medical Center, and maintains a secondary practice location in Natchez.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 7
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
Gregory William Cotter 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.
Medicare Billing Reassignments
10Medicare enrollment records show Gregory Cotter reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baton Rouge, LA 70809
- Reassigned Medicare billing, Louisiana and Mississippi enrollments
- 120 clinicians in this Medicare group
Birmingham, AL 35233
- Reassigned Medicare billing, Alabama enrollment
- 4,494 clinicians in this Medicare group
Seneca, SC 29678
- Reassigned Medicare billing, South Carolina enrollment
- Medicare enrollment name: Prisma Health University Medical Group
- 3,281 clinicians in this Medicare group
Knoxville, TN 37916
- Reassigned Medicare billing, Tennessee enrollment
- 12 clinicians in this Medicare group
Columbus, WI 53925
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Beaver Dam Community Hospitals Inc.
- 1,447 clinicians in this Medicare group
Wisconsin Rapids, WI 54494
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1952890873 (Wisconsin)
- 2,476 clinicians in this Medicare group
Neillsville, WI 54456
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1346239373 (Wisconsin)
- 1,440 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Chetek, WI 54728
- Reassigned Medicare billing, Wisconsin enrollment
- 1,616 clinicians in this Medicare group
Park Falls, WI 54552
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1700963048 (Wisconsin)
- 1,351 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 19
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Riverland Medical Center
Critical Access Hospitals · Ferriday, LAMerit Health Natchez
Acute Care Hospitals · Natchez, MSPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 70809 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 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BATON ROUGE, LA 70809
BATON ROUGE, LA 70809
BATON ROUGE, LA 70809
BATON ROUGE, LA 70809
BATON ROUGE, LA 70809
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 Gregory Cotter's NPI number?
The NPI number for Gregory Cotter is 1659363067. It was assigned to this individual provider in the NPPES registry on August 22, 2005.
Where is Gregory Cotter located?
Gregory Cotter practices at 4950 Essen Ln Ste 500, Baton Rouge, LA 70809. The listed phone number is (225) 767-0847.
What is Gregory Cotter's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Gregory Cotter enrolled in Medicare?
Yes. Gregory Cotter 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 Gregory Cotter's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Cotter reassigns Medicare benefits to 10 organizations: Mary Bird Perkins Cancer Center (Baton Rouge, LA), University Of Alabama Health Services Foundation, PC (Birmingham, AL), Ghs Partners In Health, Inc. (Seneca, SC), East Tennessee Radiation Oncology, P.C. (Knoxville, TN), Beaver Dam Community Hosptials Inc (Columbus, WI) and 5 more organizations, 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 Gregory Cotter's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gregory Cotter accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and AmeriHealth Caritas Next and 4 other insurers list Gregory Cotter 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 Gregory Cotter affiliated with any hospitals?
According to CMS data, Gregory Cotter is affiliated with Riverland Medical Center and Merit Health Natchez.
When was this NPI record last updated?
The NPPES record for Gregory Cotter was last updated on February 6, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.