WILLIAM KNIGHT GRAY MD
NPI 1891786000
Emergency Medicine in Tulsa, OK
About William Knight Gray Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM KNIGHT GRAY MD (NPI 1891786000) is an individual emergency medicine provider in Tulsa, Oklahoma, licensed in Oklahoma (14400) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Hillcrest Medical Center, and is a graduate of University Of Oklahoma College Of Medicine (1982).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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 and accepts Medicare assignment
William Knight Gray Md 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
7Medicare enrollment records show William Gray reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tulsa, OK 74104
- Reassigned Medicare billing, Kansas, Missouri and Oklahoma enrollments
- 37 clinicians in this Medicare group
Muskogee, OK 74401
- Reassigned Medicare billing, Texas enrollment
- 655 clinicians in this Medicare group
Columbus, KS 66725
- Reassigned Medicare billing, Missouri enrollment
- 562 clinicians in this Medicare group
Oklahoma City, OK 73120
- Reassigned Medicare billing, Oklahoma enrollment
- 975 clinicians in this Medicare group
Carthage, MO 64836
- Reassigned Medicare billing, Missouri enrollment
- 153 clinicians in this Medicare group
Cassville, MO 65625
- Reassigned Medicare billing, Missouri enrollment
- 151 clinicians in this Medicare group
Aurora, MO 65605
- Reassigned Medicare billing, Missouri enrollment
- 171 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 4
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Hillcrest Medical Center
Acute Care Hospitals · Tulsa, OKHillcrest Hospital Pryor
Acute Care Hospitals · Pryor, OKHillcrest Hospital Claremore
Acute Care Hospitals · Claremore, OKHillcrest Hospital Henryetta
Acute Care Hospitals · Henryetta, OKCouncil Oak Comprehensive Healthcare
Acute Care Hospitals · Tulsa, OKPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 74104 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 20
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 William Gray's NPI number?
The NPI number for William Gray is 1891786000. It was assigned to this individual provider in the NPPES registry on November 4, 2005.
Where is William Gray located?
William Gray practices at 1120 S Utica Ave, Tulsa, OK 74104. The listed phone number is (918) 728-6194.
What is William Gray's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is William Gray enrolled in Medicare?
Yes. William Gray 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 Gray's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Gray reassigns Medicare benefits to 7 organizations: Green Country Emergency Physicians Group Of Tulsa PLLC (Tulsa, OK), Creek Nation Hospital & Clinics (Muskogee, OK), Mercy Clinic Joplin LLC (Columbus, KS), Mercy Clinic Oklahoma Communities (Oklahoma City, OK), Mercy Hospital Carthage (Carthage, MO) and 2 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 William Gray's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Gray accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Kansas, Inc. and Blue Cross and Blue Shield of Oklahoma list William Gray 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 Gray affiliated with any hospitals?
According to CMS data, William Gray is affiliated with Hillcrest Medical Center, Hillcrest Hospital Pryor, Hillcrest Hospital Claremore, Hillcrest Hospital Henryetta and Council Oak Comprehensive Healthcare.
When was this NPI record last updated?
The NPPES record for William Gray was last updated on December 6, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# William Knight Gray, MD · NPI 1891786000
Emergency Medicine physician in Tulsa, Oklahoma. Individual provider, active in the CMS NPPES registry since November 4, 2005.
## Identity
- **NPI:** 1891786000 (Entity type: Individual)
- **Enumerated:** November 4, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 14400 (Oklahoma)
- **Sole proprietor:** No
## Practice location
- **Address:** 1120 S UTICA AVE, Tulsa, OK 74104-4012
- **Phone:** (918) 728-6194 · **Fax:** (918) 664-2521
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Green Country Emergency Physicians Group Of Tulsa PLLC (NPI 1972698553, Tulsa, OK); Creek Nation Hospital & Clinics (NPI 1922873611, Muskogee, OK); Mercy Clinic Joplin LLC (NPI 1043547474, Columbus, KS); Mercy Clinic Oklahoma Communities (NPI 1386874550, Oklahoma City, OK); Mercy Hospital Carthage (NPI 1003201955, Carthage, MO); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Oklahoma College Of Medicine, class of 1982
## Record status
- **NPPES last updated:** December 6, 2007
- **Other identifiers:** Medicare UPIN D88931 (OK); Other P00360689 (OK)
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Source: [NPI Profile](https://npiprofile.com/npi/1891786000) · Data from the CMS NPPES public registry.