JOHN GREGORY BUCK MD
NPI 1154608552
Pathology - Anatomic Pathology & Clinical Pathology in Irving, TX
About John Gregory Buck Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN GREGORY BUCK MD (NPI 1154608552) is an individual anatomic pathology & clinical pathology provider in Irving, Texas, licensed in Texas (K4003) and active in the NPI registry since November 2011. He is enrolled in Medicare PECOS, is affiliated with Medical City North Hills, and maintains a secondary practice location in Longview.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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 Gregory Buck 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
2Medicare enrollment records show John Buck reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Dallas, TX 75230
- Reassigned Medicare billing, Texas enrollment
- 28 clinicians in this Medicare group
Houston, TX 77004
- Reassigned Medicare billing, Texas enrollment
- 42 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 9
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Medical City North Hills
Acute Care Hospitals · North Richland Hills, TXMedical City Lewisville
Acute Care Hospitals · Lewisville, TXMedical City Arlington
Acute Care Hospitals · Arlington, TXHca Houston Healthcare Kingwood
Acute Care Hospitals · Kingwood, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 75063 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.
IRVING, TX 75063
IRVING, TX 75063
IRVING, TX 75063
IRVING, TX 75063
IRVING, TX 75063
IRVING, TX 75063
IRVING, TX 75063
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 Buck's NPI number?
The NPI number for John Buck is 1154608552. It was assigned to this individual provider in the NPPES registry on November 14, 2011.
Where is John Buck located?
John Buck practices at 4770 Regent Blvd, Irving, TX 75063. The listed phone number is (972) 934-4300.
What is John Buck's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.
Is John Buck enrolled in Medicare?
Yes. John Buck 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 Buck's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Buck reassigns Medicare benefits to 2 organizations: Ntx Pathology Program, PLLC (Dallas, TX) and Gulf Coast Pathology Program PLLC (Houston, 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 John Buck's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Buck accept?
Health plans from Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas and Cigna Healthcare list John Buck 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 Buck affiliated with any hospitals?
According to CMS data, John Buck is affiliated with Medical City North Hills, Medical City Lewisville, Medical City Arlington and Hca Houston Healthcare Kingwood.
When was this NPI record last updated?
The NPPES record for John Buck was last updated on January 26, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 Gregory Buck, MD · NPI 1154608552
Anatomic Pathology & Clinical Pathology physician in Irving, Texas. Individual provider, active in the CMS NPPES registry since November 14, 2011.
## Identity
- **NPI:** 1154608552 (Entity type: Individual)
- **Enumerated:** November 14, 2011
- **Primary specialty:** Pathology - Anatomic Pathology & Clinical Pathology · taxonomy 207ZP0102X
- **State license:** K4003 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 4770 REGENT BLVD, Irving, TX 75063-2445
- **Phone:** (972) 934-4300
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Ntx Pathology Program, PLLC (NPI 1356993703, Dallas, TX); Gulf Coast Pathology Program PLLC (NPI 1629643069, Houston, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Wayne State University School Of Medicine, class of 1991
## Record status
- **NPPES last updated:** January 26, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1154608552) · Data from the CMS NPPES public registry.