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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOHN HOLBROOK CHALMERS JR. MD
NPI 1326023896
Radiology - Diagnostic Radiology in Tyler, TX

Active since December 07, 2005
11937 US HIGHWAY 271, TYLER, TX 75708(903) 877-3451 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About John Holbrook Chalmers Jr. Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN HOLBROOK CHALMERS JR. MD (NPI 1326023896) is an individual diagnostic radiology provider in Tyler, Texas, licensed in Texas (D6981) and active in the NPI registry since December 2005.

NPPES Registry Identity

NPI1326023896
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameJOHN HOLBROOK CHALMERS JR.Credential: MD
Location Address11937 US HIGHWAY 271Tyler, TX 75708-3154
Mailing AddressPo Box 847824Dallas, TX 75284-7824
Phone(903) 877-3451
Sole ProprietorNo
Enumeration DateDecember 7, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1326023896 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in TX · D6981
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
11937 US HIGHWAY 271, Tyler, TX 75708
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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.

UNIVERSITY OF TEXAS HEALTH SCIENCE CENTER AT TYLER
Psychiatric Unit
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7200
TYLER DAVIS DO
Surgery (Trauma Surgery)
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7777
PATRICIA DIANNE SHACKELFORD
Pharmacist
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7088
JENNIFER ANNISA MATHEW DO
Student in an Organized Health Care Education/Training Program
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7200
JASMINE MARIE GAMBOA MD
Student in an Organized Health Care Education/Training Program
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7200
DR. SADIE ROSE WALTER DO
Student in an Organized Health Care Education/Training Program
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7200
RENDALL NORTHCUTT FNP
Nurse Practitioner (Primary Care)
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7200
ES-HAQ SADDELDIN HASSANIN DO
Hospitalist
11937 US HIGHWAY 271
TYLER, TX 75708
Smith County (903) 877-7253

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 Chalmers's NPI number?

The NPI number for John Chalmers is 1326023896. It was assigned to this individual provider in the NPPES registry on December 7, 2005.

Where is John Chalmers located?

John Chalmers practices at 11937 Us Highway 271, Tyler, TX 75708. The listed phone number is (903) 877-3451.

What is John Chalmers's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

When was this NPI record last updated?

The NPPES record for John Chalmers was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 32 days 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.