GREGORY WILLIAM COTTER M.D.
NPI 1659363067
Radiology - Radiation Oncology in Baton Rouge, LA

Active since August 22, 2005PECOS EnrolledAccepts Medicare Assignment
4950 ESSEN LN STE 500, BATON ROUGE, LA 70809(225) 767-0847(225) 767-1335 Get Directions Write a Review

NPPES record last updated: February 6, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 6, 2024, May 8, 2018, Oct 25, 2016 (3 updates tracked since 2016).

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

NPI1659363067
Entity TypeIndividualMale
Primary Taxonomy2085R0001X
Provider Legal NameGREGORY WILLIAM COTTERCredential: M.D.
Location Address4950 ESSEN LN STE 500Baton Rouge, LA 70809-3738
Mailing Address4950 Essen Ln Ste 500Baton Rouge, LA 70809-3738 · (225) 215-1142
Fax(225) 767-1335
Sole ProprietorNo
Medical School CMSUniversity Of South Alabama College Of MedicineGraduated 1980
Enumeration DateAugust 22, 2005
Last NPPES UpdateFebruary 6, 20243 updates tracked since enumeration
NPPES CertifiedFebruary 6, 2024
✔ NPI 1659363067 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0001X
Licenses✔ Licensed in LA · 308265✔ Licensed in SC · 11773✔ Licensed in AL · 9773✔ Licensed in MS · 15829✔ Licensed in TN · 47775
Definition
A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.
4950 ESSEN LN STE 500, Baton Rouge, LA 70809

Secondary Practice Location 1

Location 1133 Jefferson Davis BlvdNatchez, MS 39120-5103 · Phone (601) 442-1285 · Fax (601) 446-9683

Other Identifiers 7

OtherP01073107TN · Rr Medicare
Medicaid00011136MS
Other920002053AL · Rr Medicare
Medicaid000016332AL
Medicaid1528979TN
OtherP01134118MS · Rr Medicare
Other4334897TN · Bcbs Tn

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.

PECOS PAC ID8325039209
PECOS Enrollment IDI20120719000392, I20190617001934
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

10

Medicare 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.

Clinical Medical Laboratory
4950 ESSEN LANE
Baton Rouge, LA 70809
  • Reassigned Medicare billing, Louisiana and Mississippi enrollments
  • 120 clinicians in this Medicare group
Clinical Medical Laboratory
720 20TH ST S
Birmingham, AL 35233
  • Reassigned Medicare billing, Alabama enrollment
  • 4,494 clinicians in this Medicare group
Urology
135 PROFESSIONAL PARK DR
Seneca, SC 29678
  • Reassigned Medicare billing, South Carolina enrollment
  • Medicare enrollment name: Prisma Health University Medical Group
  • 3,281 clinicians in this Medicare group
Radiation Oncology
1915 WHITE AVE
Knoxville, TN 37916
  • Reassigned Medicare billing, Tennessee enrollment
  • 12 clinicians in this Medicare group
Family Medicine
1580 W JAMES ST
Columbus, WI 53925
  • Reassigned Medicare billing, Wisconsin enrollment
  • Medicare enrollment name: Beaver Dam Community Hospitals Inc.
  • 1,447 clinicians in this Medicare group
Clinic/Center
440 24TH ST S
Wisconsin Rapids, WI 54494
  • Reassigned Medicare billing, Wisconsin enrollment
  • Also billed through NPI 1952890873 (Wisconsin)
  • 2,476 clinicians in this Medicare group
Clinic/Center
N3708 RIVER AVE
Neillsville, WI 54456
  • Reassigned Medicare billing, Wisconsin enrollment
  • Also billed through NPI 1346239373 (Wisconsin)
  • 1,440 clinicians in this Medicare group
Clinic/Center
1000 N OAK AVE
Marshfield, WI 54449
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,540 clinicians in this Medicare group
Clinic/Center
806 2ND ST
Chetek, WI 54728
  • Reassigned Medicare billing, Wisconsin enrollment
  • 1,616 clinicians in this Medicare group
Clinic/Center
98 SHERRY AVE
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.

Ct guidance for insertion of radiation therapy fields 77014
CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.
883 services35 patients
Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session G6015
Intensity-modulated radiation therapy (IMRT) is a type of cancer treatment. It uses advanced technology to manipulate photon beams of radiation to conform to the shape of a tumor. IMRT allows for the radiation dose to conform more precisely to the three-dimensional shape of the tumor by modulating—or controlling—the intensity of the radiation beam. This can result in better tumor control and less harm to healthy tissue.
847 services33 patients
Calculation of radiation therapy dose 77300
Radiation therapy dose calculation is a process to determine the exact amount of radiation needed to treat a specific area in the body. This calculation helps ensure the treatment is effective while minimizing harm to healthy tissues. It's a key part of planning your radiation therapy.
304 services43 patients
Radiation treatment management, 5 treatment sessions 77427
Radiation treatment management involves a series of 5 sessions where targeted radiation is used to destroy or shrink cancer cells in your body. Each session is carefully planned to maximize effectiveness while minimizing harm to healthy tissues. You may experience side effects which will be closely monitored and managed for your comfort.
243 services47 patients
Continuing radiation therapy consultation per week 77336
Continuing radiation therapy consultation per week involves regular meetings with your healthcare team. These sessions help monitor your progress, manage side effects, and adjust your treatment plan if necessary. It's a key part of ensuring the effectiveness of your radiation therapy.
231 services50 patients
Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mev G6012
Radiation therapy involves directing high-energy particles to destroy cancer cells. The technique targets 3 or more areas, using custom blocks for precise focus. Tangential ports, wedges, and rotational beams adjust the radiation's path, while compensators balance radiation dose. Electron beam therapy with 6-10 mev energy is used for deep-seated tumors.
157 services12 patients

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, LA
OwnershipGovernment - Hospital District or Authority
CMS Certification Number191318
Location6569 Hwy 84Ferriday, LA 71334 · Concordia County
Emergency services

Merit Health Natchez

Acute Care Hospitals · Natchez, MS
2/5 CMS rating
OwnershipProprietary
CMS Certification Number250084
Location52 Sergeant Prentiss DriveNatchez, MS 39120 · Adams County
Emergency services Birthing friendly

Physician 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.

New Patient
$164.73 typical visit price
range $53.43 – $164.73
Typical copayment $41.18 (range $13.35 – $41.18)
Most-billed visit code 99205
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 12

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

Internal Medicine (Hematology & Oncology)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Internal Medicine (Hematology & Oncology)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Nurse Practitioner (Family)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Internal Medicine (Hematology & Oncology)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Nurse Practitioner (Family)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Nurse Practitioner (Adult Health)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Internal Medicine (Hematology & Oncology)
4950 ESSEN LN STE 500
BATON ROUGE, LA 70809
Internal Medicine (Hematology & Oncology)
4950 ESSEN LN STE 500
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.