GARY W WILLIAMSON MD
NPI 1851333850
Emergency Medicine in Tyler, TX
About Gary W Williamson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GARY W WILLIAMSON MD (NPI 1851333850) is an individual emergency medicine provider in Tyler, Texas, licensed in Texas (F2120) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 25
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)
Gary W Williamson Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Gary Williamson reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tyler, TX 75701
- Reassigned Medicare billing, Texas enrollment
- 547 clinicians in this Medicare group
Tyler, TX 75702
- Reassigned Medicare billing, Texas enrollment
- 2,745 clinicians in this Medicare group
Jacksonville, TX 75766
- Reassigned Medicare billing, Texas enrollment
- 409 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 75701 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 Gary Williamson's NPI number?
The NPI number for Gary Williamson is 1851333850. It was assigned to this individual provider in the NPPES registry on June 12, 2006.
Where is Gary Williamson located?
Gary Williamson practices at 800 E Dawson St, Tyler, TX 75701. The listed phone number is (903) 593-8441.
What is Gary Williamson's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Gary Williamson enrolled in Medicare?
Yes. Gary Williamson is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Gary Williamson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gary Williamson reassigns Medicare benefits to 3 organizations: Mother Frances Hospital Regional Health Care Center (Tyler, TX), Christus Trinity Clinic Texas (Tyler, TX) and Mother Frances Hospital Jacksonville (Jacksonville, 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 Gary Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gary Williamson accept?
Health plans from Blue Cross and Blue Shield of Texas and CHRISTUS Health Plan list Gary 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.
When was this NPI record last updated?
The NPPES record for Gary Williamson was last updated on March 16, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Gary W Williamson, MD · NPI 1851333850
Emergency Medicine physician in Tyler, Texas. Individual provider, active in the CMS NPPES registry since June 12, 2006.
## Identity
- **NPI:** 1851333850 (Entity type: Individual)
- **Enumerated:** June 12, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** F2120 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 800 E DAWSON ST, Tyler, TX 75701-2036
- **Phone:** (903) 593-8441
## 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): Mother Frances Hospital Regional Health Care Center (NPI 1679578439, Tyler, TX); Christus Trinity Clinic Texas (NPI 1285684225, Tyler, TX); Mother Frances Hospital Jacksonville (NPI 1952306672, Jacksonville, TX) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 16, 2015
- **Other identifiers:** Other 0042EJ (TX); Medicare PIN 00340L (TX); Medicare PIN 315974YNSX (TX); and 22 more
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Source: [NPI Profile](https://npiprofile.com/npi/1851333850) · Data from the CMS NPPES public registry.