JOHN ROSS WILLIAMSON APRN, NP-C
NPI 1386050441
Nurse Practitioner in Cordell, OK
About John Ross Williamson Aprn, Np-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN ROSS WILLIAMSON APRN, NP-C (NPI 1386050441) is an individual nurse practitioner in Cordell, Oklahoma, licensed in Oklahoma (102511) and active in the NPI registry since July 2014. He is enrolled in Medicare PECOS, is affiliated with Community Hospital, Llc, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
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
John Ross Williamson Aprn, Np-c 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
9Medicare enrollment records show John Williamson reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Cordell, OK 73632
- Reassigned Medicare billing, Oklahoma enrollment
- 19 clinicians in this Medicare group
Clinton, OK 73601
- Reassigned Medicare billing, Oklahoma enrollment
- 26 clinicians in this Medicare group
Anadarko, OK 73005
- Reassigned Medicare billing, Oklahoma enrollment
- 55 clinicians in this Medicare group
Oklahoma City, OK 73159
- Reassigned Medicare billing, Oklahoma enrollment
- 22 clinicians in this Medicare group
Oklahoma City, OK 73102
- Reassigned Medicare billing, Oklahoma enrollment
- Medicare enrollment name: Emergency Physicians Of Mid-America PC
- 310 clinicians in this Medicare group
Oklahoma City, OK 73116
- Reassigned Medicare billing, Oklahoma enrollment
- 507 clinicians in this Medicare group
Norman, OK 73071
- Reassigned Medicare billing, Oklahoma enrollment
- 418 clinicians in this Medicare group
Fairfax, OK 74637
- Reassigned Medicare billing, Oklahoma enrollment
- 55 clinicians in this Medicare group
Grove, OK 74344
- Reassigned Medicare billing, Oklahoma enrollment
- 95 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 2
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Community Hospital, LLC
Acute Care Hospitals · Oklahoma City, OKClinton Regional Hospital
Acute Care Hospitals · Clinton, OKCordell Memorial Hospital
Critical Access Hospitals · Cordell, OKPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 73632 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
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 John Williamson's NPI number?
The NPI number for John Williamson is 1386050441. It was assigned to this individual provider in the NPPES registry on July 9, 2014.
Where is John Williamson located?
John Williamson practices at 1220 N Glenn English St, Cordell, OK 73632. The listed phone number is (580) 832-3339.
What is John Williamson's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is John Williamson enrolled in Medicare?
Yes. John Williamson 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 John Williamson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Williamson reassigns Medicare benefits to 9 organizations: Cordell Memorial Hospital 0189 (Cordell, OK), Clinton Hospital Authority (Clinton, OK), Rural Wellness Anadarko Inc (Anadarko, OK), Community Hospital LLC (Oklahoma City, OK), Emergency Physicians Of Mid-America, P.C. (Oklahoma City, OK) and 4 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 John Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Williamson accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 2 other insurers list John Williamson 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 John Williamson affiliated with any hospitals?
According to CMS data, John Williamson is affiliated with Community Hospital, LLC, Clinton Regional Hospital and Cordell Memorial Hospital.
When was this NPI record last updated?
The NPPES record for John Williamson was last updated on January 9, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# John Ross Williamson, APRN, NP-C · NPI 1386050441
Nurse Practitioner physician in Cordell, Oklahoma. Individual provider, active in the CMS NPPES registry since July 9, 2014.
## Identity
- **NPI:** 1386050441 (Entity type: Individual)
- **Enumerated:** July 9, 2014
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 102511 (Oklahoma)
- **Sole proprietor:** No
## Practice location
- **Address:** 1220 N GLENN ENGLISH ST, Cordell, OK 73632-2010
- **Phone:** (580) 832-3339
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 9 organizations under Medicare reassignment (form CMS-855R): Cordell Memorial Hospital 0189 (NPI 1750384426, Cordell, OK); Clinton Hospital Authority (NPI 1528812237, Clinton, OK); Rural Wellness Anadarko Inc (NPI 1538825120, Anadarko, OK); Community Hospital LLC (NPI 1730366832, Oklahoma City, OK); Emergency Physicians Of Mid-America, P.C. (NPI 1063825297, Oklahoma City, OK); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** January 9, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1386050441) · Data from the CMS NPPES public registry.