DR. MARGARET P ELLIS MD
NPI 1649304114
Internal Medicine in Grove, OK
About Dr. Margaret P Ellis Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARGARET P ELLIS MD (NPI 1649304114) is an individual internal medicine provider in Grove, Oklahoma, licensed in Oklahoma (20200) and active in the NPI registry since March 2007. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 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 (PECOS)
Dr. Margaret P Ellis Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Margaret Ellis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tahlequah, OK 74464
- Reassigned Medicare billing, Oklahoma enrollment
- 159 clinicians in this Medicare group
Magnolia, AR 71753
- Reassigned Medicare billing, Arkansas enrollment
- 106 clinicians in this Medicare group
Dallas, TX 75252
- Reassigned Medicare billing, Arkansas enrollment
- 130 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 74344 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 5
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 Margaret Ellis's NPI number?
The NPI number for Margaret Ellis is 1649304114. It was assigned to this individual provider in the NPPES registry on March 15, 2007.
Where is Margaret Ellis located?
Margaret Ellis practices at 10 E 13th St, Grove, OK 74344. The listed phone number is (918) 787-1909.
What is Margaret Ellis's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Margaret Ellis enrolled in Medicare?
Yes. Margaret Ellis is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Margaret Ellis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Ellis reassigns Medicare benefits to 3 organizations: Northeastern Health System (Tahlequah, OK), Hcc Of Magnolia LLC (Magnolia, AR) and Emergency Staffing Solutions Region III (Dallas, TX). 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 Margaret Ellis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Ellis accept?
Health plans from Arkansas Blue Cross and Blue Shield, Blue Cross and Blue Shield of Oklahoma, Health Advantage and Octave list Margaret Ellis 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 Margaret Ellis was last updated on June 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.
# Dr. Margaret P Ellis, MD · NPI 1649304114
Internal Medicine physician in Grove, Oklahoma. Individual provider, active in the CMS NPPES registry since March 15, 2007.
## Identity
- **NPI:** 1649304114 (Entity type: Individual)
- **Enumerated:** March 15, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 20200 (Oklahoma)
- **Sole proprietor:** No
## Practice location
- **Address:** 10 E 13TH ST, Grove, OK 74344-5300
- **Phone:** (918) 787-1909 · **Fax:** (918) 787-3866
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Northeastern Health System (NPI 1003865999, Tahlequah, OK); Hcc Of Magnolia LLC (NPI 1831865872, Magnolia, AR); Emergency Staffing Solutions Region III (NPI 1689967895, Dallas, TX) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 6, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1649304114) · Data from the CMS NPPES public registry.